Use the new unified vertex/fragment program interpreter from prog_execute.c.

Currently, DDX, DDY don't work.

1 files changed, 12 insertions, 1511 deletions

diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c
index a41b3ce125..4482006ba6 100644
--- a/src/mesa/swrast/s_fragprog.c
+++ b/src/mesa/swrast/s_fragprog.c
@@ -25,6 +25,7 @@
 #include "glheader.h"
 #include "colormac.h"
 #include "context.h"
+#include "prog_execute.h"
 #include "prog_instruction.h"
 #include "prog_parameter.h"
 #include "prog_print.h"
@@ -35,63 +36,6 @@
 #include "slang_library_noise.h"
 
 
-/* See comments below for info about this */
-#define LAMBDA_ZERO 1
-
-/* debug predicate */
-#define DEBUG_FRAG 0
-
-
-/**
- * Virtual machine state used during execution of a fragment programs.
- */
-struct fp_machine
-{
-   /** Fragment Input attributes */
-   GLfloat (*Attribs)[MAX_WIDTH][4];
-   GLuint CurFrag; /**< Index into Attribs arrays */
-
-   GLfloat Temporaries[MAX_PROGRAM_TEMPS][4];
-   GLfloat Outputs[FRAG_RESULT_MAX][4];
-   GLuint CondCodes[4];  /**< COND_* value for x/y/z/w */
-
-   GLuint CallStack[MAX_PROGRAM_CALL_DEPTH]; /**< For CAL/RET instructions */
-   GLuint StackDepth; /**< Index/ptr to top of CallStack[] */
-};
-
-
-#if FEATURE_MESA_program_debug
-static struct fp_machine *CurrentMachine = NULL;
-
-/**
- * For GL_MESA_program_debug.
- * Return current value (4*GLfloat) of a fragment program register.
- * Called via ctx->Driver.GetFragmentProgramRegister().
- */
-void
-_swrast_get_program_register(GLcontext *ctx, enum register_file file,
-                             GLuint index, GLfloat val[4])
-{
-   if (CurrentMachine) {
-      switch (file) {
-      case PROGRAM_INPUT:
-         COPY_4V(val, CurrentMachine->Attribs[index][CurrentMachine->CurFrag]);
-         break;
-      case PROGRAM_OUTPUT:
-         COPY_4V(val, CurrentMachine->Outputs[index]);
-         break;
-      case PROGRAM_TEMPORARY:
-         COPY_4V(val, CurrentMachine->Temporaries[index]);
-         break;
-      default:
-         _mesa_problem(NULL,
-                       "bad register file in _swrast_get_program_register");
-      }
-   }
-}
-#endif /* FEATURE_MESA_program_debug */
-
-
 /**
  * Fetch a texel.
  */
@@ -147,1449 +91,6 @@ fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
 
 
 /**
- * Return a pointer to the 4-element float vector specified by the given
- * source register.
- */
-static INLINE const GLfloat *
-get_register_pointer( GLcontext *ctx,
-                      const struct prog_src_register *source,
-                      const struct fp_machine *machine,
-                      const struct gl_fragment_program *program )
-{
-   /* XXX relative addressing... */
-   switch (source->File) {
-   case PROGRAM_TEMPORARY:
-      ASSERT(source->Index < MAX_PROGRAM_TEMPS);
-      return machine->Temporaries[source->Index];
-   case PROGRAM_INPUT:
-      ASSERT(source->Index < FRAG_ATTRIB_MAX);
-      return machine->Attribs[source->Index][machine->CurFrag];
-   case PROGRAM_OUTPUT:
-      /* This is only for PRINT */
-      ASSERT(source->Index < FRAG_RESULT_MAX);
-      return machine->Outputs[source->Index];
-   case PROGRAM_LOCAL_PARAM:
-      ASSERT(source->Index < MAX_PROGRAM_LOCAL_PARAMS);
-      return program->Base.LocalParams[source->Index];
-   case PROGRAM_ENV_PARAM:
-      ASSERT(source->Index < MAX_PROGRAM_ENV_PARAMS);
-      return ctx->FragmentProgram.Parameters[source->Index];
-   case PROGRAM_STATE_VAR:
-      /* Fallthrough */
-   case PROGRAM_CONSTANT:
-      /* Fallthrough */
-   case PROGRAM_UNIFORM:
-      /* Fallthrough */
-   case PROGRAM_NAMED_PARAM:
-      ASSERT(source->Index < (GLint) program->Base.Parameters->NumParameters);
-      return program->Base.Parameters->ParameterValues[source->Index];
-   default:
-      _mesa_problem(ctx, "Invalid input register file %d in fp "
-                    "get_register_pointer", source->File);
-      return NULL;
-   }
-}
-
-
-/**
- * Fetch a 4-element float vector from the given source register.
- * Apply swizzling and negating as needed.
- */
-static void
-fetch_vector4( GLcontext *ctx,
-               const struct prog_src_register *source,
-               const struct fp_machine *machine,
-               const struct gl_fragment_program *program,
-               GLfloat result[4] )
-{
-   const GLfloat *src = get_register_pointer(ctx, source, machine, program);
-   ASSERT(src);
-
-   if (source->Swizzle == SWIZZLE_NOOP) {
-      /* no swizzling */
-      COPY_4V(result, src);
-   }
-   else {
-      ASSERT(GET_SWZ(source->Swizzle, 0) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 1) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 2) <= 3);
-      ASSERT(GET_SWZ(source->Swizzle, 3) <= 3);
-      result[0] = src[GET_SWZ(source->Swizzle, 0)];
-      result[1] = src[GET_SWZ(source->Swizzle, 1)];
-      result[2] = src[GET_SWZ(source->Swizzle, 2)];
-      result[3] = src[GET_SWZ(source->Swizzle, 3)];
-   }
-
-   if (source->NegateBase) {
-      result[0] = -result[0];
-      result[1] = -result[1];
-      result[2] = -result[2];
-      result[3] = -result[3];
-   }
-   if (source->Abs) {
-      result[0] = FABSF(result[0]);
-      result[1] = FABSF(result[1]);
-      result[2] = FABSF(result[2]);
-      result[3] = FABSF(result[3]);
-   }
-   if (source->NegateAbs) {
-      result[0] = -result[0];
-      result[1] = -result[1];
-      result[2] = -result[2];
-      result[3] = -result[3];
-   }
-}
-
-
-/**
- * Fetch the derivative with respect to X for the given register.
- * \return GL_TRUE if it was easily computed or GL_FALSE if we
- * need to execute another instance of the program (ugh)!
- */
-static GLboolean
-fetch_vector4_deriv( GLcontext *ctx,
-                     const struct prog_src_register *source,
-                     const SWspan *span,
-                     char xOrY, GLint column, GLfloat result[4] )
-{
-   GLfloat src[4];
-
-   ASSERT(xOrY == 'X' || xOrY == 'Y');
-
-   switch (source->Index) {
-   case FRAG_ATTRIB_WPOS:
-      if (xOrY == 'X') {
-         src[0] = 1.0;
-         src[1] = 0.0;
-         src[2] = span->attrStepX[FRAG_ATTRIB_WPOS][2]
-                / ctx->DrawBuffer->_DepthMaxF;
-         src[3] = span->attrStepX[FRAG_ATTRIB_WPOS][3];
-      }
-      else {
-         src[0] = 0.0;
-         src[1] = 1.0;
-         src[2] = span->attrStepY[FRAG_ATTRIB_WPOS][2]
-                / ctx->DrawBuffer->_DepthMaxF;
-         src[3] = span->attrStepY[FRAG_ATTRIB_WPOS][3];
-      }
-      break;
-   case FRAG_ATTRIB_COL0:
-   case FRAG_ATTRIB_COL1:
-      if (xOrY == 'X') {
-         src[0] = span->attrStepX[source->Index][0] * (1.0F / CHAN_MAXF);
-         src[1] = span->attrStepX[source->Index][1] * (1.0F / CHAN_MAXF);
-         src[2] = span->attrStepX[source->Index][2] * (1.0F / CHAN_MAXF);
-         src[3] = span->attrStepX[source->Index][3] * (1.0F / CHAN_MAXF);
-      }
-      else {
-         src[0] = span->attrStepY[source->Index][0] * (1.0F / CHAN_MAXF);
-         src[1] = span->attrStepY[source->Index][1] * (1.0F / CHAN_MAXF);
-         src[2] = span->attrStepY[source->Index][2] * (1.0F / CHAN_MAXF);
-         src[3] = span->attrStepY[source->Index][3] * (1.0F / CHAN_MAXF);
-      }
-      break;
-   case FRAG_ATTRIB_FOGC:
-      if (xOrY == 'X') {
-         src[0] = span->attrStepX[FRAG_ATTRIB_FOGC][0] * (1.0F / CHAN_MAXF);
-         src[1] = 0.0;
-         src[2] = 0.0;
-         src[3] = 0.0;
-      }
-      else {
-         src[0] = span->attrStepY[FRAG_ATTRIB_FOGC][0] * (1.0F / CHAN_MAXF);
-         src[1] = 0.0;
-         src[2] = 0.0;
-         src[3] = 0.0;
-      }
-      break;
-   default:
-      assert(source->Index < FRAG_ATTRIB_MAX);
-      /* texcoord or varying */
-      if (xOrY == 'X') {
-         /* this is a little tricky - I think I've got it right */
-         const GLfloat invQ = 1.0f / (span->attrStart[source->Index][3]
-                               + span->attrStepX[source->Index][3] * column);
-         src[0] = span->attrStepX[source->Index][0] * invQ;
-         src[1] = span->attrStepX[source->Index][1] * invQ;
-         src[2] = span->attrStepX[source->Index][2] * invQ;
-         src[3] = span->attrStepX[source->Index][3] * invQ;
-      }
-      else {
-         /* Tricky, as above, but in Y direction */
-         const GLfloat invQ = 1.0f / (span->attrStart[source->Index][3]
-                                      + span->attrStepY[source->Index][3]);
-         src[0] = span->attrStepY[source->Index][0] * invQ;
-         src[1] = span->attrStepY[source->Index][1] * invQ;
-         src[2] = span->attrStepY[source->Index][2] * invQ;
-         src[3] = span->attrStepY[source->Index][3] * invQ;
-      }
-      break;
-   }
-
-   result[0] = src[GET_SWZ(source->Swizzle, 0)];
-   result[1] = src[GET_SWZ(source->Swizzle, 1)];
-   result[2] = src[GET_SWZ(source->Swizzle, 2)];
-   result[3] = src[GET_SWZ(source->Swizzle, 3)];
-
-   if (source->NegateBase) {
-      result[0] = -result[0];
-      result[1] = -result[1];
-      result[2] = -result[2];
-      result[3] = -result[3];
-   }
-   if (source->Abs) {
-      result[0] = FABSF(result[0]);
-      result[1] = FABSF(result[1]);
-      result[2] = FABSF(result[2]);
-      result[3] = FABSF(result[3]);
-   }
-   if (source->NegateAbs) {
-      result[0] = -result[0];
-      result[1] = -result[1];
-      result[2] = -result[2];
-      result[3] = -result[3];
-   }
-   return GL_TRUE;
-}
-
-
-/**
- * As above, but only return result[0] element.
- */
-static void
-fetch_vector1( GLcontext *ctx,
-               const struct prog_src_register *source,
-               const struct fp_machine *machine,
-               const struct gl_fragment_program *program,
-               GLfloat result[4] )
-{
-   const GLfloat *src = get_register_pointer(ctx, source, machine, program);
-   ASSERT(src);
-
-   result[0] = src[GET_SWZ(source->Swizzle, 0)];
-
-   if (source->NegateBase) {
-      result[0] = -result[0];
-   }
-   if (source->Abs) {
-      result[0] = FABSF(result[0]);
-   }
-   if (source->NegateAbs) {
-      result[0] = -result[0];
-   }
-}
-
-
-/**
- * Test value against zero and return GT, LT, EQ or UN if NaN.
- */
-static INLINE GLuint
-generate_cc( float value )
-{
-   if (value != value)
-      return COND_UN;  /* NaN */
-   if (value > 0.0F)
-      return COND_GT;
-   if (value < 0.0F)
-      return COND_LT;
-   return COND_EQ;
-}
-
-
-/**
- * Test if the ccMaskRule is satisfied by the given condition code.
- * Used to mask destination writes according to the current condition code.
- */
-static INLINE GLboolean
-test_cc(GLuint condCode, GLuint ccMaskRule)
-{
-   switch (ccMaskRule) {
-   case COND_EQ: return (condCode == COND_EQ);
-   case COND_NE: return (condCode != COND_EQ);
-   case COND_LT: return (condCode == COND_LT);
-   case COND_GE: return (condCode == COND_GT || condCode == COND_EQ);
-   case COND_LE: return (condCode == COND_LT || condCode == COND_EQ);
-   case COND_GT: return (condCode == COND_GT);
-   case COND_TR: return GL_TRUE;
-   case COND_FL: return GL_FALSE;
-   default:      return GL_TRUE;
-   }
-}
-
-
-/**
- * Evaluate the 4 condition codes against a predicate and return GL_TRUE
- * or GL_FALSE to indicate result.
- */
-static INLINE GLboolean
-eval_condition(const struct fp_machine *machine,
-               const struct prog_instruction *inst)
-{
-   const GLuint swizzle = inst->DstReg.CondSwizzle;
-   const GLuint condMask = inst->DstReg.CondMask;
-   if (test_cc(machine->CondCodes[GET_SWZ(swizzle, 0)], condMask) ||
-       test_cc(machine->CondCodes[GET_SWZ(swizzle, 1)], condMask) ||
-       test_cc(machine->CondCodes[GET_SWZ(swizzle, 2)], condMask) ||
-       test_cc(machine->CondCodes[GET_SWZ(swizzle, 3)], condMask)) {
-      return GL_TRUE;
-   }
-   else {
-      return GL_FALSE;
-   }
-}
-
-
-
-/**
- * Store 4 floats into a register.  Observe the instructions saturate and
- * set-condition-code flags.
- */
-static void
-store_vector4( const struct prog_instruction *inst,
-               struct fp_machine *machine,
-               const GLfloat value[4] )
-{
-   const struct prog_dst_register *dest = &(inst->DstReg);
-   const GLboolean clamp = inst->SaturateMode == SATURATE_ZERO_ONE;
-   GLfloat *dstReg;
-   GLfloat dummyReg[4];
-   GLfloat clampedValue[4];
-   GLuint writeMask = dest->WriteMask;
-
-   switch (dest->File) {
-      case PROGRAM_OUTPUT:
-         dstReg = machine->Outputs[dest->Index];
-         break;
-      case PROGRAM_TEMPORARY:
-         dstReg = machine->Temporaries[dest->Index];
-         break;
-      case PROGRAM_WRITE_ONLY:
-         dstReg = dummyReg;
-         return;
-      default:
-         _mesa_problem(NULL, "bad register file in store_vector4(fp)");
-         return;
-   }
-
-#if 0
-   if (value[0] > 1.0e10 ||
-       IS_INF_OR_NAN(value[0]) ||
-       IS_INF_OR_NAN(value[1]) ||
-       IS_INF_OR_NAN(value[2]) ||
-       IS_INF_OR_NAN(value[3])  )
-      printf("store %g %g %g %g\n", value[0], value[1], value[2], value[3]);
-#endif
-
-   if (clamp) {
-      clampedValue[0] = CLAMP(value[0], 0.0F, 1.0F);
-      clampedValue[1] = CLAMP(value[1], 0.0F, 1.0F);
-      clampedValue[2] = CLAMP(value[2], 0.0F, 1.0F);
-      clampedValue[3] = CLAMP(value[3], 0.0F, 1.0F);
-      value = clampedValue;
-   }
-
-   if (dest->CondMask != COND_TR) {
-      /* condition codes may turn off some writes */
-      if (writeMask & WRITEMASK_X) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 0)],
-                      dest->CondMask))
-            writeMask &= ~WRITEMASK_X;
-      }
-      if (writeMask & WRITEMASK_Y) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 1)],
-                      dest->CondMask))
-            writeMask &= ~WRITEMASK_Y;
-      }
-      if (writeMask & WRITEMASK_Z) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 2)],
-                      dest->CondMask))
-            writeMask &= ~WRITEMASK_Z;
-      }
-      if (writeMask & WRITEMASK_W) {
-         if (!test_cc(machine->CondCodes[GET_SWZ(dest->CondSwizzle, 3)],
-                      dest->CondMask))
-            writeMask &= ~WRITEMASK_W;
-      }
-   }
-
-   if (writeMask & WRITEMASK_X)
-      dstReg[0] = value[0];
-   if (writeMask & WRITEMASK_Y)
-      dstReg[1] = value[1];
-   if (writeMask & WRITEMASK_Z)
-      dstReg[2] = value[2];
-   if (writeMask & WRITEMASK_W)
-      dstReg[3] = value[3];
-
-   if (inst->CondUpdate) {
-      if (writeMask & WRITEMASK_X)
-         machine->CondCodes[0] = generate_cc(value[0]);
-      if (writeMask & WRITEMASK_Y)
-         machine->CondCodes[1] = generate_cc(value[1]);
-      if (writeMask & WRITEMASK_Z)
-         machine->CondCodes[2] = generate_cc(value[2]);
-      if (writeMask & WRITEMASK_W)
-         machine->CondCodes[3] = generate_cc(value[3]);
-   }
-}
-
-
-/**
- * Initialize a new machine state instance from an existing one, adding
- * the partial derivatives onto the input registers.
- * Used to implement DDX and DDY instructions in non-trivial cases.
- */
-static void
-init_machine_deriv( GLcontext *ctx,
-                    const struct fp_machine *machine,
-                    const struct gl_fragment_program *program,
-                    const SWspan *span, char xOrY,
-                    struct fp_machine *dMachine )
-{
-   GLuint attr;
-
-   ASSERT(xOrY == 'X' || xOrY == 'Y');
-
-   /* copy existing machine */
-   _mesa_memcpy(dMachine, machine, sizeof(struct fp_machine));
-
-   if (program->Base.Target == GL_FRAGMENT_PROGRAM_NV) {
-      /* XXX also need to do this when using valgrind */
-      /* Clear temporary registers (undefined for ARB_f_p) */
-      _mesa_bzero( (void*) machine->Temporaries,
-                   MAX_PROGRAM_TEMPS * 4 * sizeof(GLfloat));
-   }
-
-   /* Add derivatives */
-   if (program->Base.InputsRead & FRAG_BIT_WPOS) {
-      GLfloat *wpos = machine->Attribs[FRAG_ATTRIB_WPOS][machine->CurFrag];
-      if (xOrY == 'X') {
-         wpos[0] += 1.0F;
-         wpos[1] += 0.0F;
-         wpos[2] += span->attrStepX[FRAG_ATTRIB_WPOS][2];
-         wpos[3] += span->attrStepX[FRAG_ATTRIB_WPOS][3];
-      }
-      else {
-         wpos[0] += 0.0F;
-         wpos[1] += 1.0F;
-         wpos[2] += span->attrStepY[FRAG_ATTRIB_WPOS][2];
-         wpos[3] += span->attrStepY[FRAG_ATTRIB_WPOS][3];
-      }
-   }
-
-   /* primary, secondary colors */
-   for (attr = FRAG_ATTRIB_COL0; attr <= FRAG_ATTRIB_COL1; attr++) {
-      if (program->Base.InputsRead & (1 << attr)) {
-         GLfloat *col = machine->Attribs[attr][machine->CurFrag];
-         if (xOrY == 'X') {
-            col[0] += span->attrStepX[attr][0] * (1.0F / CHAN_MAXF);
-            col[1] += span->attrStepX[attr][1] * (1.0F / CHAN_MAXF);
-            col[2] += span->attrStepX[attr][2] * (1.0F / CHAN_MAXF);
-            col[3] += span->attrStepX[attr][3] * (1.0F / CHAN_MAXF);
-         }
-         else {
-            col[0] += span->attrStepY[attr][0] * (1.0F / CHAN_MAXF);
-            col[1] += span->attrStepY[attr][1] * (1.0F / CHAN_MAXF);
-            col[2] += span->attrStepY[attr][2] * (1.0F / CHAN_MAXF);
-            col[3] += span->attrStepY[attr][3] * (1.0F / CHAN_MAXF);
-         }
-      }
-   }
-   if (program->Base.InputsRead & FRAG_BIT_FOGC) {
-      GLfloat *fogc = machine->Attribs[FRAG_ATTRIB_FOGC][machine->CurFrag];
-      if (xOrY == 'X') {
-         fogc[0] += span->attrStepX[FRAG_ATTRIB_FOGC][0];
-      }
-      else {
-         fogc[0] += span->attrStepY[FRAG_ATTRIB_FOGC][0];
-      }
-   }
-   /* texcoord and varying vars */
-   for (attr = FRAG_ATTRIB_TEX0; attr < FRAG_ATTRIB_MAX; attr++) {
-      if (program->Base.InputsRead & (1 << attr)) {
-         GLfloat *val = machine->Attribs[attr][machine->CurFrag];
-         /* XXX perspective-correct interpolation */
-         if (xOrY == 'X') {
-            val[0] += span->attrStepX[attr][0];
-            val[1] += span->attrStepX[attr][1];
-            val[2] += span->attrStepX[attr][2];
-            val[3] += span->attrStepX[attr][3];
-         }
-         else {
-            val[0] += span->attrStepY[attr][0];
-            val[1] += span->attrStepY[attr][1];
-            val[2] += span->attrStepY[attr][2];
-            val[3] += span->attrStepY[attr][3];
-         }
-      }
-   }
-
-   /* init condition codes */
-   dMachine->CondCodes[0] = COND_EQ;
-   dMachine->CondCodes[1] = COND_EQ;
-   dMachine->CondCodes[2] = COND_EQ;
-   dMachine->CondCodes[3] = COND_EQ;
-}
-
-
-/**
- * Execute the given vertex program.
- * NOTE: we do everything in single-precision floating point; we don't
- * currently observe the single/half/fixed-precision qualifiers.
- * \param ctx - rendering context
- * \param program - the fragment program to execute
- * \param machine - machine state (register file)
- * \param maxInst - max number of instructions to execute
- * \return GL_TRUE if program completed or GL_FALSE if program executed KIL.
- */
-static GLboolean
-execute_program( GLcontext *ctx,
-                 const struct gl_fragment_program *program, GLuint maxInst,
-                 struct fp_machine *machine, const SWspan *span,
-                 GLuint column )
-{
-   const GLuint MAX_EXEC = 10000;
-   GLint pc, total = 0;
-
-   if (DEBUG_FRAG) {
-      printf("execute fragment program --------------------\n");
-   }
-
-   for (pc = 0; pc < maxInst; pc++) {
-      const struct prog_instruction *inst = program->Base.Instructions + pc;
-
-      if (ctx->FragmentProgram.CallbackEnabled &&
-          ctx->FragmentProgram.Callback) {
-         ctx->FragmentProgram.CurrentPosition = inst->StringPos;
-         ctx->FragmentProgram.Callback(program->Base.Target,
-                                       ctx->FragmentProgram.CallbackData);
-      }
-
-      if (DEBUG_FRAG) {
-         _mesa_print_instruction(inst);
-      }
-
-      switch (inst->Opcode) {
-         case OPCODE_ABS:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = FABSF(a[0]);
-               result[1] = FABSF(a[1]);
-               result[2] = FABSF(a[2]);
-               result[3] = FABSF(a[3]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_ADD:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = a[0] + b[0];
-               result[1] = a[1] + b[1];
-               result[2] = a[2] + b[2];
-               result[3] = a[3] + b[3];
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("ADD (%g %g %g %g) = (%g %g %g %g) + (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3], 
-                         a[0], a[1], a[2], a[3],
-                         b[0], b[1], b[2], b[3]);
-               }
-            }
-            break;
-         case OPCODE_BGNLOOP:
-            /* no-op */
-            break;
-         case OPCODE_ENDLOOP:
-            /* subtract 1 here since pc is incremented by for(pc) loop */
-            pc = inst->BranchTarget - 1; /* go to matching BNGLOOP */
-            break;
-         case OPCODE_BGNSUB: /* begin subroutine */
-            break;
-         case OPCODE_ENDSUB: /* end subroutine */
-            break;
-         case OPCODE_BRA: /* branch (conditional) */
-            /* fall-through */
-         case OPCODE_BRK: /* break out of loop (conditional) */
-            /* fall-through */
-         case OPCODE_CONT: /* continue loop (conditional) */
-            if (eval_condition(machine, inst)) {
-               /* take branch */
-               /* Subtract 1 here since we'll do pc++ at end of for-loop */
-               pc = inst->BranchTarget - 1;
-            }
-            break;
-         case OPCODE_CAL: /* Call subroutine (conditional) */
-            if (eval_condition(machine, inst)) {
-               /* call the subroutine */
-               if (machine->StackDepth >= MAX_PROGRAM_CALL_DEPTH) {
-                  return GL_TRUE; /* Per GL_NV_vertex_program2 spec */
-               }
-               machine->CallStack[machine->StackDepth++] = pc + 1;
-               pc = inst->BranchTarget; /* XXX - 1 ??? */
-            }
-            break;
-         case OPCODE_CMP:
-            {
-               GLfloat a[4], b[4], c[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
-               result[0] = a[0] < 0.0F ? b[0] : c[0];
-               result[1] = a[1] < 0.0F ? b[1] : c[1];
-               result[2] = a[2] < 0.0F ? b[2] : c[2];
-               result[3] = a[3] < 0.0F ? b[3] : c[3];
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_COS:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = result[1] = result[2] = result[3]
-                  = (GLfloat) _mesa_cos(a[0]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_DDX: /* Partial derivative with respect to X */
-            {
-               GLfloat a[4], aNext[4], result[4];
-               struct fp_machine dMachine;
-               if (!fetch_vector4_deriv(ctx, &inst->SrcReg[0], span, 'X',
-                                        column, result)) {
-                  /* This is tricky.  Make a copy of the current machine state,
-                   * increment the input registers by the dx or dy partial
-                   * derivatives, then re-execute the program up to the
-                   * preceeding instruction, then fetch the source register.
-                   * Finally, find the difference in the register values for
-                   * the original and derivative runs.
-                   */
-                  fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a);
-                  init_machine_deriv(ctx, machine, program, span,
-                                     'X', &dMachine);
-                  execute_program(ctx, program, pc, &dMachine, span, column);
-                  fetch_vector4( ctx, &inst->SrcReg[0], &dMachine, program, aNext );
-                  result[0] = aNext[0] - a[0];
-                  result[1] = aNext[1] - a[1];
-                  result[2] = aNext[2] - a[2];
-                  result[3] = aNext[3] - a[3];
-               }
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_DDY: /* Partial derivative with respect to Y */
-            {
-               GLfloat a[4], aNext[4], result[4];
-               struct fp_machine dMachine;
-               if (!fetch_vector4_deriv(ctx, &inst->SrcReg[0], span, 'Y',
-                                        column, result)) {
-                  init_machine_deriv(ctx, machine, program, span,
-                                     'Y', &dMachine);
-                  fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a);
-                  execute_program(ctx, program, pc, &dMachine, span, column);
-                  fetch_vector4( ctx, &inst->SrcReg[0], &dMachine, program, aNext );
-                  result[0] = aNext[0] - a[0];
-                  result[1] = aNext[1] - a[1];
-                  result[2] = aNext[2] - a[2];
-                  result[3] = aNext[3] - a[3];
-               }
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_DP3:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = result[1] = result[2] = result[3] = DOT3(a, b);
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("DP3 %g = (%g %g %g) . (%g %g %g)\n",
-                         result[0], a[0], a[1], a[2], b[0], b[1], b[2]);
-               }
-            }
-            break;
-         case OPCODE_DP4:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = result[1] = result[2] = result[3] = DOT4(a,b);
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("DP4 %g = (%g, %g %g %g) . (%g, %g %g %g)\n",
-                         result[0], a[0], a[1], a[2], a[3],
-                         b[0], b[1], b[2], b[3]);
-               }
-            }
-            break;
-         case OPCODE_DPH:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = result[1] = result[2] = result[3] = 
-                  a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + b[3];
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_DST: /* Distance vector */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = 1.0F;
-               result[1] = a[1] * b[1];
-               result[2] = a[2];
-               result[3] = b[3];
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_EX2: /* Exponential base 2 */
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = result[1] = result[2] = result[3] =
-                  (GLfloat) _mesa_pow(2.0, a[0]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_FLR:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = FLOORF(a[0]);
-               result[1] = FLOORF(a[1]);
-               result[2] = FLOORF(a[2]);
-               result[3] = FLOORF(a[3]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_FRC:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = a[0] - FLOORF(a[0]);
-               result[1] = a[1] - FLOORF(a[1]);
-               result[2] = a[2] - FLOORF(a[2]);
-               result[3] = a[3] - FLOORF(a[3]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_IF:
-            if (eval_condition(machine, inst)) {
-               /* do if-clause (just continue execution) */
-            }
-            else {
-               /* go to the instruction after ELSE or ENDIF */
-               assert(inst->BranchTarget >= 0);
-               pc = inst->BranchTarget - 1;
-            }
-            break;
-         case OPCODE_ELSE:
-            /* goto ENDIF */
-            assert(inst->BranchTarget >= 0);
-            pc = inst->BranchTarget - 1;
-            break;
-         case OPCODE_ENDIF:
-            /* nothing */
-            break;
-         case OPCODE_INT: /* float to int */
-            {
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = (GLfloat) (GLint) a[0];
-               result[1] = (GLfloat) (GLint) a[1];
-               result[2] = (GLfloat) (GLint) a[2];
-               result[3] = (GLfloat) (GLint) a[3];
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_KIL_NV: /* NV_f_p only (conditional) */
-            if (eval_condition(machine, inst)) {
-               return GL_FALSE;
-            }
-            break;
-         case OPCODE_KIL: /* ARB_f_p only */
-            {
-               GLfloat a[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               if (a[0] < 0.0F || a[1] < 0.0F || a[2] < 0.0F || a[3] < 0.0F) {
-                  return GL_FALSE;
-               }
-            }
-            break;
-         case OPCODE_LG2:  /* log base 2 */
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = result[1] = result[2] = result[3] = LOG2(a[0]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_LIT:
-            {
-               const GLfloat epsilon = 1.0F / 256.0F; /* from NV VP spec */
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               a[0] = MAX2(a[0], 0.0F);
-               a[1] = MAX2(a[1], 0.0F);
-               /* XXX ARB version clamps a[3], NV version doesn't */
-               a[3] = CLAMP(a[3], -(128.0F - epsilon), (128.0F - epsilon));
-               result[0] = 1.0F;
-               result[1] = a[0];
-               /* XXX we could probably just use pow() here */
-               if (a[0] > 0.0F) {
-                  if (a[1] == 0.0 && a[3] == 0.0)
-                     result[2] = 1.0;
-                  else
-                     result[2] = EXPF(a[3] * LOGF(a[1]));
-               }
-               else {
-                  result[2] = 0.0;
-               }
-               result[3] = 1.0F;
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("LIT (%g %g %g %g) : (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3],
-                         a[0], a[1], a[2], a[3]);
-               }
-            }
-            break;
-         case OPCODE_LRP:
-            {
-               GLfloat a[4], b[4], c[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
-               result[0] = a[0] * b[0] + (1.0F - a[0]) * c[0];
-               result[1] = a[1] * b[1] + (1.0F - a[1]) * c[1];
-               result[2] = a[2] * b[2] + (1.0F - a[2]) * c[2];
-               result[3] = a[3] * b[3] + (1.0F - a[3]) * c[3];
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("LRP (%g %g %g %g) = (%g %g %g %g), "
-                         "(%g %g %g %g), (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3],
-                         a[0], a[1], a[2], a[3],
-                         b[0], b[1], b[2], b[3],
-                         c[0], c[1], c[2], c[3]);
-               }
-            }
-            break;
-         case OPCODE_MAD:
-            {
-               GLfloat a[4], b[4], c[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
-               result[0] = a[0] * b[0] + c[0];
-               result[1] = a[1] * b[1] + c[1];
-               result[2] = a[2] * b[2] + c[2];
-               result[3] = a[3] * b[3] + c[3];
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("MAD (%g %g %g %g) = (%g %g %g %g) * "
-                         "(%g %g %g %g) + (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3],
-                         a[0], a[1], a[2], a[3],
-                         b[0], b[1], b[2], b[3],
-                         c[0], c[1], c[2], c[3]);
-               }
-            }
-            break;
-         case OPCODE_MAX:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = MAX2(a[0], b[0]);
-               result[1] = MAX2(a[1], b[1]);
-               result[2] = MAX2(a[2], b[2]);
-               result[3] = MAX2(a[3], b[3]);
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("MAX (%g %g %g %g) = (%g %g %g %g), (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3], 
-                         a[0], a[1], a[2], a[3],
-                         b[0], b[1], b[2], b[3]);
-               }
-            }
-            break;
-         case OPCODE_MIN:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = MIN2(a[0], b[0]);
-               result[1] = MIN2(a[1], b[1]);
-               result[2] = MIN2(a[2], b[2]);
-               result[3] = MIN2(a[3], b[3]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_MOV:
-            {
-               GLfloat result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, result );
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("MOV (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3]);
-               }
-            }
-            break;
-         case OPCODE_MUL:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = a[0] * b[0];
-               result[1] = a[1] * b[1];
-               result[2] = a[2] * b[2];
-               result[3] = a[3] * b[3];
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("MUL (%g %g %g %g) = (%g %g %g %g) * (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3], 
-                         a[0], a[1], a[2], a[3],
-                         b[0], b[1], b[2], b[3]);
-               }
-            }
-            break;
-         case OPCODE_NOISE1:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] =
-               result[1] =
-               result[2] =
-               result[3] = _slang_library_noise1(a[0]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_NOISE2:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] =
-               result[1] =
-               result[2] =
-               result[3] = _slang_library_noise2(a[0], a[1]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_NOISE3:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] =
-               result[1] =
-               result[2] =
-               result[3] = _slang_library_noise3(a[0], a[1], a[2]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_NOISE4:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] =
-               result[1] =
-               result[2] =
-               result[3] = _slang_library_noise4(a[0], a[1], a[2], a[3]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_NOP:
-            break;
-         case OPCODE_PK2H: /* pack two 16-bit floats in one 32-bit float */
-            {
-               GLfloat a[4], result[4];
-               GLhalfNV hx, hy;
-               GLuint *rawResult = (GLuint *) result;
-               GLuint twoHalves;
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               hx = _mesa_float_to_half(a[0]);
-               hy = _mesa_float_to_half(a[1]);
-               twoHalves = hx | (hy << 16);
-               rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
-                  = twoHalves;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_PK2US: /* pack two GLushorts into one 32-bit float */
-            {
-               GLfloat a[4], result[4];
-               GLuint usx, usy, *rawResult = (GLuint *) result;
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               a[0] = CLAMP(a[0], 0.0F, 1.0F);
-               a[1] = CLAMP(a[1], 0.0F, 1.0F);
-               usx = IROUND(a[0] * 65535.0F);
-               usy = IROUND(a[1] * 65535.0F);
-               rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
-                  = usx | (usy << 16);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_PK4B: /* pack four GLbytes into one 32-bit float */
-            {
-               GLfloat a[4], result[4];
-               GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               a[0] = CLAMP(a[0], -128.0F / 127.0F, 1.0F);
-               a[1] = CLAMP(a[1], -128.0F / 127.0F, 1.0F);
-               a[2] = CLAMP(a[2], -128.0F / 127.0F, 1.0F);
-               a[3] = CLAMP(a[3], -128.0F / 127.0F, 1.0F);
-               ubx = IROUND(127.0F * a[0] + 128.0F);
-               uby = IROUND(127.0F * a[1] + 128.0F);
-               ubz = IROUND(127.0F * a[2] + 128.0F);
-               ubw = IROUND(127.0F * a[3] + 128.0F);
-               rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
-                  = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_PK4UB: /* pack four GLubytes into one 32-bit float */
-            {
-               GLfloat a[4], result[4];
-               GLuint ubx, uby, ubz, ubw, *rawResult = (GLuint *) result;
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               a[0] = CLAMP(a[0], 0.0F, 1.0F);
-               a[1] = CLAMP(a[1], 0.0F, 1.0F);
-               a[2] = CLAMP(a[2], 0.0F, 1.0F);
-               a[3] = CLAMP(a[3], 0.0F, 1.0F);
-               ubx = IROUND(255.0F * a[0]);
-               uby = IROUND(255.0F * a[1]);
-               ubz = IROUND(255.0F * a[2]);
-               ubw = IROUND(255.0F * a[3]);
-               rawResult[0] = rawResult[1] = rawResult[2] = rawResult[3]
-                  = ubx | (uby << 8) | (ubz << 16) | (ubw << 24);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_POW:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector1( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = result[1] = result[2] = result[3]
-                  = (GLfloat)_mesa_pow(a[0], b[0]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_RCP:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               if (DEBUG_FRAG) {
-                  if (a[0] == 0)
-                     printf("RCP(0)\n");
-                  else if (IS_INF_OR_NAN(a[0]))
-                     printf("RCP(inf)\n");
-               }
-               result[0] = result[1] = result[2] = result[3] = 1.0F / a[0];
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_RET: /* return from subroutine (conditional) */
-            if (eval_condition(machine, inst)) {
-               if (machine->StackDepth == 0) {
-                  return GL_TRUE; /* Per GL_NV_vertex_program2 spec */
-               }
-               pc = machine->CallStack[--machine->StackDepth];
-            }
-            break;
-         case OPCODE_RFL: /* reflection vector */
-            {
-               GLfloat axis[4], dir[4], result[4], tmpX, tmpW;
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, axis );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, dir );
-               tmpW = DOT3(axis, axis);
-               tmpX = (2.0F * DOT3(axis, dir)) / tmpW;
-               result[0] = tmpX * axis[0] - dir[0];
-               result[1] = tmpX * axis[1] - dir[1];
-               result[2] = tmpX * axis[2] - dir[2];
-               /* result[3] is never written! XXX enforce in parser! */
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_RSQ: /* 1 / sqrt() */
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               a[0] = FABSF(a[0]);
-               result[0] = result[1] = result[2] = result[3] = INV_SQRTF(a[0]);
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("RSQ %g = 1/sqrt(|%g|)\n", result[0], a[0]);
-               }
-            }
-            break;
-         case OPCODE_SCS: /* sine and cos */
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = (GLfloat) _mesa_cos(a[0]);
-               result[1] = (GLfloat) _mesa_sin(a[0]);
-               result[2] = 0.0;  /* undefined! */
-               result[3] = 0.0;  /* undefined! */
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SEQ: /* set on equal */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = (a[0] == b[0]) ? 1.0F : 0.0F;
-               result[1] = (a[1] == b[1]) ? 1.0F : 0.0F;
-               result[2] = (a[2] == b[2]) ? 1.0F : 0.0F;
-               result[3] = (a[3] == b[3]) ? 1.0F : 0.0F;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SFL: /* set false, operands ignored */
-            {
-               static const GLfloat result[4] = { 0.0F, 0.0F, 0.0F, 0.0F };
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SGE: /* set on greater or equal */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = (a[0] >= b[0]) ? 1.0F : 0.0F;
-               result[1] = (a[1] >= b[1]) ? 1.0F : 0.0F;
-               result[2] = (a[2] >= b[2]) ? 1.0F : 0.0F;
-               result[3] = (a[3] >= b[3]) ? 1.0F : 0.0F;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SGT: /* set on greater */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = (a[0] > b[0]) ? 1.0F : 0.0F;
-               result[1] = (a[1] > b[1]) ? 1.0F : 0.0F;
-               result[2] = (a[2] > b[2]) ? 1.0F : 0.0F;
-               result[3] = (a[3] > b[3]) ? 1.0F : 0.0F;
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("SGT %g %g %g %g\n",
-                         result[0], result[1], result[2], result[3]);
-               }
-            }
-            break;
-         case OPCODE_SIN:
-            {
-               GLfloat a[4], result[4];
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = result[1] = result[2] = result[3]
-                  = (GLfloat) _mesa_sin(a[0]);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SLE: /* set on less or equal */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = (a[0] <= b[0]) ? 1.0F : 0.0F;
-               result[1] = (a[1] <= b[1]) ? 1.0F : 0.0F;
-               result[2] = (a[2] <= b[2]) ? 1.0F : 0.0F;
-               result[3] = (a[3] <= b[3]) ? 1.0F : 0.0F;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SLT: /* set on less */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = (a[0] < b[0]) ? 1.0F : 0.0F;
-               result[1] = (a[1] < b[1]) ? 1.0F : 0.0F;
-               result[2] = (a[2] < b[2]) ? 1.0F : 0.0F;
-               result[3] = (a[3] < b[3]) ? 1.0F : 0.0F;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SNE: /* set on not equal */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = (a[0] != b[0]) ? 1.0F : 0.0F;
-               result[1] = (a[1] != b[1]) ? 1.0F : 0.0F;
-               result[2] = (a[2] != b[2]) ? 1.0F : 0.0F;
-               result[3] = (a[3] != b[3]) ? 1.0F : 0.0F;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_STR: /* set true, operands ignored */
-            {
-               static const GLfloat result[4] = { 1.0F, 1.0F, 1.0F, 1.0F };
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_SUB:
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = a[0] - b[0];
-               result[1] = a[1] - b[1];
-               result[2] = a[2] - b[2];
-               result[3] = a[3] - b[3];
-               store_vector4( inst, machine, result );
-               if (DEBUG_FRAG) {
-                  printf("SUB (%g %g %g %g) = (%g %g %g %g) - (%g %g %g %g)\n",
-                         result[0], result[1], result[2], result[3],
-                         a[0], a[1], a[2], a[3], b[0], b[1], b[2], b[3]);
-               }
-            }
-            break;
-         case OPCODE_SWZ: /* extended swizzle */
-            {
-               const struct prog_src_register *source = &inst->SrcReg[0];
-               const GLfloat *src = get_register_pointer(ctx, source,
-                                                         machine, program);
-               GLfloat result[4];
-               GLuint i;
-               for (i = 0; i < 4; i++) {
-                  const GLuint swz = GET_SWZ(source->Swizzle, i);
-                  if (swz == SWIZZLE_ZERO)
-                     result[i] = 0.0;
-                  else if (swz == SWIZZLE_ONE)
-                     result[i] = 1.0;
-                  else {
-                     ASSERT(swz >= 0);
-                     ASSERT(swz <= 3);
-                     result[i] = src[swz];
-                  }
-                  if (source->NegateBase & (1 << i))
-                     result[i] = -result[i];
-               }
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_TEX: /* Both ARB and NV frag prog */
-            /* Texel lookup */
-            {
-               /* Note: only use the precomputed lambda value when we're
-                * sampling texture unit [K] with texcoord[K].
-                * Otherwise, the lambda value may have no relation to the
-                * instruction's texcoord or texture image.  Using the wrong
-                * lambda is usually bad news.
-                * The rest of the time, just use zero (until we get a more
-                * sophisticated way of computing lambda).
-                */
-               GLfloat coord[4], color[4], lambda;
-               if (inst->SrcReg[0].File == PROGRAM_INPUT &&
-                   inst->SrcReg[0].Index == FRAG_ATTRIB_TEX0+inst->TexSrcUnit)
-                  lambda = span->array->lambda[inst->TexSrcUnit][column];
-               else
-                  lambda = 0.0;
-               fetch_vector4(ctx, &inst->SrcReg[0], machine, program, coord);
-               fetch_texel( ctx, coord, lambda, inst->TexSrcUnit, color );
-               if (DEBUG_FRAG) {
-                  printf("TEX (%g, %g, %g, %g) = texture[%d][%g, %g, %g, %g], "
-                         "lod %f\n",
-                         color[0], color[1], color[2], color[3],
-                         inst->TexSrcUnit,
-                         coord[0], coord[1], coord[2], coord[3], lambda);
-               }
-               store_vector4( inst, machine, color );
-            }
-            break;
-         case OPCODE_TXB: /* GL_ARB_fragment_program only */
-            /* Texel lookup with LOD bias */
-            {
-               const struct gl_texture_unit *texUnit
-                  = &ctx->Texture.Unit[inst->TexSrcUnit];
-               GLfloat coord[4], color[4], lambda, bias;
-               if (inst->SrcReg[0].File == PROGRAM_INPUT &&
-                   inst->SrcReg[0].Index == FRAG_ATTRIB_TEX0+inst->TexSrcUnit)
-                  lambda = span->array->lambda[inst->TexSrcUnit][column];
-               else
-                  lambda = 0.0;
-               fetch_vector4(ctx, &inst->SrcReg[0], machine, program, coord);
-               /* coord[3] is the bias to add to lambda */
-               bias = texUnit->LodBias + coord[3];
-               if (texUnit->_Current)
-                  bias += texUnit->_Current->LodBias;
-               fetch_texel(ctx, coord, lambda + bias, inst->TexSrcUnit, color);
-               store_vector4( inst, machine, color );
-            }
-            break;
-         case OPCODE_TXD: /* GL_NV_fragment_program only */
-            /* Texture lookup w/ partial derivatives for LOD */
-            {
-               GLfloat texcoord[4], dtdx[4], dtdy[4], color[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, texcoord );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, dtdx );
-               fetch_vector4( ctx, &inst->SrcReg[2], machine, program, dtdy );
-               fetch_texel_deriv( ctx, texcoord, dtdx, dtdy, inst->TexSrcUnit,
-                                  color );
-               store_vector4( inst, machine, color );
-            }
-            break;
-         case OPCODE_TXP: /* GL_ARB_fragment_program only */
-            /* Texture lookup w/ projective divide */
-            {
-               GLfloat texcoord[4], color[4], lambda;
-               if (inst->SrcReg[0].File == PROGRAM_INPUT &&
-                   inst->SrcReg[0].Index == FRAG_ATTRIB_TEX0+inst->TexSrcUnit)
-                  lambda = span->array->lambda[inst->TexSrcUnit][column];
-               else
-                  lambda = 0.0;
-               fetch_vector4(ctx, &inst->SrcReg[0], machine, program,texcoord);
-	       /* Not so sure about this test - if texcoord[3] is
-		* zero, we'd probably be fine except for an ASSERT in
-		* IROUND_POS() which gets triggered by the inf values created.
-		*/
-	       if (texcoord[3] != 0.0) {
-		  texcoord[0] /= texcoord[3];
-		  texcoord[1] /= texcoord[3];
-		  texcoord[2] /= texcoord[3];
-	       }
-               fetch_texel( ctx, texcoord, lambda, inst->TexSrcUnit, color );
-               store_vector4( inst, machine, color );
-            }
-            break;
-         case OPCODE_TXP_NV: /* GL_NV_fragment_program only */
-            /* Texture lookup w/ projective divide */
-            {
-               GLfloat texcoord[4], color[4], lambda;
-               if (inst->SrcReg[0].File == PROGRAM_INPUT &&
-                   inst->SrcReg[0].Index == FRAG_ATTRIB_TEX0+inst->TexSrcUnit)
-                  lambda = span->array->lambda[inst->TexSrcUnit][column];
-               else
-                  lambda = 0.0;
-               fetch_vector4(ctx, &inst->SrcReg[0], machine, program,texcoord);
-               if (inst->TexSrcTarget != TEXTURE_CUBE_INDEX &&
-		   texcoord[3] != 0.0) {
-                  texcoord[0] /= texcoord[3];
-                  texcoord[1] /= texcoord[3];
-                  texcoord[2] /= texcoord[3];
-               }
-               fetch_texel( ctx, texcoord, lambda, inst->TexSrcUnit, color );
-               store_vector4( inst, machine, color );
-            }
-            break;
-         case OPCODE_UP2H: /* unpack two 16-bit floats */
-            {
-               GLfloat a[4], result[4];
-               const GLuint *rawBits = (const GLuint *) a;
-               GLhalfNV hx, hy;
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               hx = rawBits[0] & 0xffff;
-               hy = rawBits[0] >> 16;
-               result[0] = result[2] = _mesa_half_to_float(hx);
-               result[1] = result[3] = _mesa_half_to_float(hy);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_UP2US: /* unpack two GLushorts */
-            {
-               GLfloat a[4], result[4];
-               const GLuint *rawBits = (const GLuint *) a;
-               GLushort usx, usy;
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               usx = rawBits[0] & 0xffff;
-               usy = rawBits[0] >> 16;
-               result[0] = result[2] = usx * (1.0f / 65535.0f);
-               result[1] = result[3] = usy * (1.0f / 65535.0f);
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_UP4B: /* unpack four GLbytes */
-            {
-               GLfloat a[4], result[4];
-               const GLuint *rawBits = (const GLuint *) a;
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = (((rawBits[0] >>  0) & 0xff) - 128) / 127.0F;
-               result[1] = (((rawBits[0] >>  8) & 0xff) - 128) / 127.0F;
-               result[2] = (((rawBits[0] >> 16) & 0xff) - 128) / 127.0F;
-               result[3] = (((rawBits[0] >> 24) & 0xff) - 128) / 127.0F;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_UP4UB: /* unpack four GLubytes */
-            {
-               GLfloat a[4], result[4];
-               const GLuint *rawBits = (const GLuint *) a;
-               fetch_vector1( ctx, &inst->SrcReg[0], machine, program, a );
-               result[0] = ((rawBits[0] >>  0) & 0xff) / 255.0F;
-               result[1] = ((rawBits[0] >>  8) & 0xff) / 255.0F;
-               result[2] = ((rawBits[0] >> 16) & 0xff) / 255.0F;
-               result[3] = ((rawBits[0] >> 24) & 0xff) / 255.0F;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_XPD: /* cross product */
-            {
-               GLfloat a[4], b[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               result[0] = a[1] * b[2] - a[2] * b[1];
-               result[1] = a[2] * b[0] - a[0] * b[2];
-               result[2] = a[0] * b[1] - a[1] * b[0];
-               result[3] = 1.0;
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_X2D: /* 2-D matrix transform */
-            {
-               GLfloat a[4], b[4], c[4], result[4];
-               fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a );
-               fetch_vector4( ctx, &inst->SrcReg[1], machine, program, b );
-               fetch_vector4( ctx, &inst->SrcReg[2], machine, program, c );
-               result[0] = a[0] + b[0] * c[0] + b[1] * c[1];
-               result[1] = a[1] + b[0] * c[2] + b[1] * c[3];
-               result[2] = a[2] + b[0] * c[0] + b[1] * c[1];
-               result[3] = a[3] + b[0] * c[2] + b[1] * c[3];
-               store_vector4( inst, machine, result );
-            }
-            break;
-         case OPCODE_PRINT:
-            {
-               if (inst->SrcReg[0].File != -1) {
-                  GLfloat a[4];
-                  fetch_vector4( ctx, &inst->SrcReg[0], machine, program, a);
-                  _mesa_printf("%s%g, %g, %g, %g\n", (const char *) inst->Data,
-                               a[0], a[1], a[2], a[3]);
-               }
-               else {
-                  _mesa_printf("%s\n", (const char *) inst->Data);
-               }
-            }
-            break;
-         case OPCODE_END:
-            return GL_TRUE;
-         default:
-            _mesa_problem(ctx, "Bad opcode %d in _mesa_exec_fragment_program",
-                          inst->Opcode);
-            return GL_TRUE; /* return value doesn't matter */
-
-      }
-      total++;
-      if (total > MAX_EXEC) {
-         _mesa_problem(ctx, "Infinite loop detected in fragment program");
-         return GL_TRUE;
-         abort();
-      }
-   }
-   return GL_TRUE;
-}
-
-
-/**
  * Initialize the virtual fragment program machine state prior to running
  * fragment program on a fragment.  This involves initializing the input
  * registers, condition codes, etc.
@@ -1599,9 +100,9 @@ execute_program( GLcontext *ctx,
  * \param col  which element (column) of the span we'll operate on
  */
 static void
-init_machine( GLcontext *ctx, struct fp_machine *machine,
-              const struct gl_fragment_program *program,
-              const SWspan *span, GLuint col )
+init_machine(GLcontext *ctx, struct gl_program_machine *machine,
+             const struct gl_fragment_program *program,
+             const SWspan *span, GLuint col)
 {
    GLuint inputsRead = program->Base.InputsRead;
 
@@ -1616,7 +117,7 @@ init_machine( GLcontext *ctx, struct fp_machine *machine,
 
    /* Setup pointer to input attributes */
    machine->Attribs = span->array->attribs;
-   machine->CurFrag = col;
+   machine->CurElement = col;
 
    /* init condition codes */
    machine->CondCodes[0] = COND_EQ;
@@ -1626,6 +127,9 @@ init_machine( GLcontext *ctx, struct fp_machine *machine,
 
    /* init call stack */
    machine->StackDepth = 0;
+
+   machine->FetchTexelLod = fetch_texel;
+   machine->FetchTexelDeriv = fetch_texel_deriv;
 }
 
 
@@ -1636,17 +140,16 @@ static void
 run_program(GLcontext *ctx, SWspan *span, GLuint start, GLuint end)
 {
    const struct gl_fragment_program *program = ctx->FragmentProgram._Current;
-   struct fp_machine machine;
+   struct gl_program_machine machine;
    GLuint i;
 
-   CurrentMachine = &machine;
-
    for (i = start; i < end; i++) {
       if (span->array->mask[i]) {
          init_machine(ctx, &machine, program, span, i);
 
-         if (execute_program(ctx, program, program->Base.NumInstructions,
-                             &machine, span, i)) {
+         if (_mesa_execute_program(ctx, &program->Base,
+                                   program->Base.NumInstructions,
+                                   &machine, i)) {
             /* Store result color */
             COPY_4V(span->array->attribs[FRAG_ATTRIB_COL0][i],
                     machine.Outputs[FRAG_RESULT_COLR]);
@@ -1669,8 +172,6 @@ run_program(GLcontext *ctx, SWspan *span, GLuint start, GLuint end)
          }
       }
    }
-
-   CurrentMachine = NULL;
 }