Implement projective texture sampling, 3D textures. Disable some debug output.

7 files changed, 143 insertions, 119 deletions

diff --git a/src/mesa/shader/slang/library/slang_common_builtin.gc b/src/mesa/shader/slang/library/slang_common_builtin.gc
index 52f5b96d88..184a92ce34 100644
--- a/src/mesa/shader/slang/library/slang_common_builtin.gc
+++ b/src/mesa/shader/slang/library/slang_common_builtin.gc
@@ -1633,38 +1633,42 @@ vec4 texture1DProj(const sampler1D sampler, const vec4 coord)
 
 vec4 texture2D(const sampler2D sampler, const vec2 coord)
 {
-    __asm vec4_tex2d __retVal, sampler, coord; // XXX sampler
+    __asm vec4_tex2d __retVal, sampler, coord;
 }
 
-//vec4 texture2DProj(const sampler2D sampler, const vec3 coord)
-//{
-//   vec2 pcoord = coord.st / coord.p;
-//    __asm vec4_tex2d __retVal, pcoord; // XXX sampler
-//}
+vec4 texture2DProj(const sampler2D sampler, const vec3 coord)
+{
+   // new coord with .z moved to .w
+   vec4 coord4;
+   coord4.xy = coord.xy;
+   coord4.w = coord.z;
+    __asm vec4_texp2d __retVal, sampler, coord4;
+}
 
-//vec4 texture2DProj(const sampler2D sampler, const vec4 coord)
-//{
-//   vec2 pcoord = coord.st / coord.q;
-//    __asm vec4_tex2d __retVal, pcoord; // XXX sampler
-//}
+vec4 texture2DProj(const sampler2D sampler, const vec4 coord)
+{
+    __asm vec4_texp2d __retVal, coord;
+}
 
 
-vec4 texture3D (sampler3D sampler, vec3 coord) {
-    vec4 texel;
-    __asm vec4_tex3d texel, sampler, coord, 0.0;
-    return texel;
+vec4 texture3D(const sampler3D sampler, const vec3 coord)
+{
+   __asm vec4_tex3d __retVal, sampler, coord;
 }
 
-vec4 texture3DProj (sampler3D sampler, vec4 coord) {
-    return texture3D (sampler, vec3 (coord.s / coord.q, coord.t / coord.q, coord.p / coord.q));
+vec4 texture3DProj(const sampler3D sampler, const vec4 coord)
+{
+   __asm vec4_texp3d __retVal, sampler, coord;
 }
 
-vec4 textureCube (samplerCube sampler, vec3 coord) {
-    vec4 texel;
-    __asm vec4_texcube texel, sampler, coord, 0.0;
-    return texel;
+
+vec4 textureCube(const samplerCube sampler, const vec3 coord)
+{
+   __asm vec4_texcube __retVal, sampler, coord;
 }
 
+
+
 vec4 shadow1D (sampler1DShadow sampler, vec3 coord) {
     vec4 texel;
     __asm vec4_shad1d texel, sampler, coord, 0.0;
diff --git a/src/mesa/shader/slang/library/slang_common_builtin_gc.h b/src/mesa/shader/slang/library/slang_common_builtin_gc.h
index e418f53213..3a089e5838 100644
--- a/src/mesa/shader/slang/library/slang_common_builtin_gc.h
+++ b/src/mesa/shader/slang/library/slang_common_builtin_gc.h
@@ -682,81 +682,85 @@
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-51,52,0,0,0,17,55,0,54,54,0,0,0,17,51,0,50,51,0,0,0,17,50,0,55,55,0,0,0,0,46,0,0,0,58,110,111,105,
-115,101,49,0,18,120,0,58,118,101,99,52,0,17,53,0,52,55,0,0,0,17,49,55,0,56,53,0,0,0,17,49,49,0,48,
-52,0,0,0,17,49,51,0,49,57,0,0,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,52,0,
-17,50,51,0,53,52,0,0,0,17,50,57,0,49,49,0,0,0,17,51,49,0,57,49,0,0,0,17,51,55,0,52,56,0,0,0,0,46,0,
-0,0,0,0,0,0
+101,99,52,95,115,104,97,100,50,100,0,18,116,101,120,101,108,0,0,18,115,97,109,112,108,101,114,0,0,
+18,99,111,111,114,100,0,0,17,48,0,48,0,0,0,0,8,18,116,101,120,101,108,0,0,0,1,0,12,0,115,104,97,
+100,111,119,50,68,80,114,111,106,0,1,0,0,21,115,97,109,112,108,101,114,0,0,1,0,0,12,99,111,111,114,
+100,0,0,0,1,8,58,115,104,97,100,111,119,50,68,0,18,115,97,109,112,108,101,114,0,0,58,118,101,99,51,
+0,18,99,111,111,114,100,0,59,115,0,18,99,111,111,114,100,0,59,113,0,49,0,18,99,111,111,114,100,0,
+59,116,0,18,99,111,111,114,100,0,59,113,0,49,0,18,99,111,111,114,100,0,59,112,0,18,99,111,111,114,
+100,0,59,113,0,49,0,0,0,0,0,0,1,0,9,0,110,111,105,115,101,49,0,1,0,0,9,120,0,0,0,1,3,2,0,9,1,97,0,
+0,0,4,102,108,111,97,116,95,110,111,105,115,101,49,0,18,97,0,0,18,120,0,0,0,8,18,97,0,0,0,1,0,9,0,
+110,111,105,115,101,49,0,1,0,0,10,120,0,0,0,1,3,2,0,9,1,97,0,0,0,4,102,108,111,97,116,95,110,111,
+105,115,101,50,0,18,97,0,0,18,120,0,0,0,8,18,97,0,0,0,1,0,9,0,110,111,105,115,101,49,0,1,0,0,11,
+120,0,0,0,1,3,2,0,9,1,97,0,0,0,4,102,108,111,97,116,95,110,111,105,115,101,51,0,18,97,0,0,18,120,0,
+0,0,8,18,97,0,0,0,1,0,9,0,110,111,105,115,101,49,0,1,0,0,12,120,0,0,0,1,3,2,0,9,1,97,0,0,0,4,102,
+108,111,97,116,95,110,111,105,115,101,52,0,18,97,0,0,18,120,0,0,0,8,18,97,0,0,0,1,0,10,0,110,111,
+105,115,101,50,0,1,0,0,9,120,0,0,0,1,8,58,118,101,99,50,0,58,110,111,105,115,101,49,0,18,120,0,0,0,
+0,58,110,111,105,115,101,49,0,18,120,0,17,49,57,0,51,52,0,0,46,0,0,0,0,0,0,1,0,10,0,110,111,105,
+115,101,50,0,1,0,0,10,120,0,0,0,1,8,58,118,101,99,50,0,58,110,111,105,115,101,49,0,18,120,0,0,0,0,
+58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,50,0,17,49,57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,
+0,46,0,0,0,0,0,0,1,0,10,0,110,111,105,115,101,50,0,1,0,0,11,120,0,0,0,1,8,58,118,101,99,50,0,58,
+110,111,105,115,101,49,0,18,120,0,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,51,0,17,
+49,57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,17,51,0,50,51,0,0,0,0,46,0,0,0,0,0,0,1,0,10,0,110,111,105,
+115,101,50,0,1,0,0,12,120,0,0,0,1,8,58,118,101,99,50,0,58,110,111,105,115,101,49,0,18,120,0,0,0,0,
+58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,52,0,17,49,57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,
+17,51,0,50,51,0,0,0,17,50,0,55,55,0,0,0,0,46,0,0,0,0,0,0,1,0,11,0,110,111,105,115,101,51,0,1,0,0,9,
+120,0,0,0,1,8,58,118,101,99,51,0,58,110,111,105,115,101,49,0,18,120,0,0,0,0,58,110,111,105,115,101,
+49,0,18,120,0,17,49,57,0,51,52,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,17,53,0,52,55,0,0,
+46,0,0,0,0,0,0,1,0,11,0,110,111,105,115,101,51,0,1,0,0,10,120,0,0,0,1,8,58,118,101,99,51,0,58,110,
+111,105,115,101,49,0,18,120,0,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,50,0,17,49,
+57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,
+50,0,17,53,0,52,55,0,0,0,17,49,55,0,56,53,0,0,0,0,46,0,0,0,0,0,0,1,0,11,0,110,111,105,115,101,51,0,
+1,0,0,11,120,0,0,0,1,8,58,118,101,99,51,0,58,110,111,105,115,101,49,0,18,120,0,0,0,0,58,110,111,
+105,115,101,49,0,18,120,0,58,118,101,99,51,0,17,49,57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,17,51,0,50,
+51,0,0,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,51,0,17,53,0,52,55,0,0,0,17,
+49,55,0,56,53,0,0,0,17,49,49,0,48,52,0,0,0,0,46,0,0,0,0,0,0,1,0,11,0,110,111,105,115,101,51,0,1,0,
+0,12,120,0,0,0,1,8,58,118,101,99,51,0,58,110,111,105,115,101,49,0,18,120,0,0,0,0,58,110,111,105,
+115,101,49,0,18,120,0,58,118,101,99,52,0,17,49,57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,17,51,0,50,51,
+0,0,0,17,50,0,55,55,0,0,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,52,0,17,53,
+0,52,55,0,0,0,17,49,55,0,56,53,0,0,0,17,49,49,0,48,52,0,0,0,17,49,51,0,49,57,0,0,0,0,46,0,0,0,0,0,
+0,1,0,12,0,110,111,105,115,101,52,0,1,0,0,9,120,0,0,0,1,8,58,118,101,99,52,0,58,110,111,105,115,
+101,49,0,18,120,0,0,0,0,58,110,111,105,115,101,49,0,18,120,0,17,49,57,0,51,52,0,0,46,0,0,0,58,110,
+111,105,115,101,49,0,18,120,0,17,53,0,52,55,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,17,
+50,51,0,53,52,0,0,46,0,0,0,0,0,0,1,0,12,0,110,111,105,115,101,52,0,1,0,0,10,120,0,0,0,1,8,58,118,
+101,99,52,0,58,110,111,105,115,101,49,0,18,120,0,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,
+101,99,50,0,17,49,57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,
+120,0,58,118,101,99,50,0,17,53,0,52,55,0,0,0,17,49,55,0,56,53,0,0,0,0,46,0,0,0,58,110,111,105,115,
+101,49,0,18,120,0,58,118,101,99,50,0,17,50,51,0,53,52,0,0,0,17,50,57,0,49,49,0,0,0,0,46,0,0,0,0,0,
+0,1,0,12,0,110,111,105,115,101,52,0,1,0,0,11,120,0,0,0,1,8,58,118,101,99,52,0,58,110,111,105,115,
+101,49,0,18,120,0,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,51,0,17,49,57,0,51,52,0,
+0,0,17,55,0,54,54,0,0,0,17,51,0,50,51,0,0,0,0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,
+101,99,51,0,17,53,0,52,55,0,0,0,17,49,55,0,56,53,0,0,0,17,49,49,0,48,52,0,0,0,0,46,0,0,0,58,110,
+111,105,115,101,49,0,18,120,0,58,118,101,99,51,0,17,50,51,0,53,52,0,0,0,17,50,57,0,49,49,0,0,0,17,
+51,49,0,57,49,0,0,0,0,46,0,0,0,0,0,0,1,0,12,0,110,111,105,115,101,52,0,1,0,0,12,120,0,0,0,1,8,58,
+118,101,99,52,0,58,110,111,105,115,101,49,0,18,120,0,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,
+118,101,99,52,0,17,49,57,0,51,52,0,0,0,17,55,0,54,54,0,0,0,17,51,0,50,51,0,0,0,17,50,0,55,55,0,0,0,
+0,46,0,0,0,58,110,111,105,115,101,49,0,18,120,0,58,118,101,99,52,0,17,53,0,52,55,0,0,0,17,49,55,0,
+56,53,0,0,0,17,49,49,0,48,52,0,0,0,17,49,51,0,49,57,0,0,0,0,46,0,0,0,58,110,111,105,115,101,49,0,
+18,120,0,58,118,101,99,52,0,17,50,51,0,53,52,0,0,0,17,50,57,0,49,49,0,0,0,17,51,49,0,57,49,0,0,0,
+17,51,55,0,52,56,0,0,0,0,46,0,0,0,0,0,0,0
diff --git a/src/mesa/shader/slang/slang_assemble.c b/src/mesa/shader/slang/slang_assemble.c
index 617249487f..89f5df1e05 100644
--- a/src/mesa/shader/slang/slang_assemble.c
+++ b/src/mesa/shader/slang/slang_assemble.c
@@ -746,7 +746,11 @@ static const struct
    {"int_to_float", slang_asm_int_to_float, slang_asm_float_copy},
    {"vec4_tex1d", slang_asm_vec4_tex1d, slang_asm_none},
    {"vec4_tex2d", slang_asm_vec4_tex2d, slang_asm_none},
+   {"vec4_texb2d", slang_asm_vec4_tex2d, slang_asm_none},
+   {"vec4_texp2d", slang_asm_vec4_tex2d, slang_asm_none},
    {"vec4_tex3d", slang_asm_vec4_tex3d, slang_asm_none},
+   {"vec4_texb3d", slang_asm_vec4_tex3d, slang_asm_none},
+   {"vec4_texp3d", slang_asm_vec4_tex3d, slang_asm_none},
    {"vec4_texcube", slang_asm_vec4_texcube, slang_asm_none},
    {"vec4_shad1d", slang_asm_vec4_shad1d, slang_asm_none},
    {"vec4_shad2d", slang_asm_vec4_shad2d, slang_asm_none},
diff --git a/src/mesa/shader/slang/slang_codegen.c b/src/mesa/shader/slang/slang_codegen.c
index 239f6a5e75..fee317b61f 100644
--- a/src/mesa/shader/slang/slang_codegen.c
+++ b/src/mesa/shader/slang/slang_codegen.c
@@ -189,6 +189,7 @@ is_sampler_type(const slang_fully_specified_type *t)
 static GLuint
 _slang_sizeof_struct(const slang_struct *s)
 {
+   /* XXX TBD */
    return 0;
 }
 
@@ -404,6 +405,8 @@ _slang_input_index(const char *name, GLenum target)
    const struct input_info *inputs
       = (target == GL_VERTEX_PROGRAM_ARB) ? vertInputs : fragInputs;
 
+   ASSERT(MAX_TEXTURE_UNITS == 8); /* if this fails, fix vertInputs above */
+
    for (i = 0; inputs[i].Name; i++) {
       if (strcmp(inputs[i].Name, name) == 0) {
          /* found */
@@ -476,6 +479,7 @@ _slang_codegen_global_variable(slang_variable *var, struct gl_program *prog,
    const char *varName = (char *) var->a_name;
    GLint texIndex;
    slang_ir_storage *store = NULL;
+   int dbg = 0;
 
    texIndex = sampler_to_texture_index(var->type.specifier.type);
 
@@ -487,7 +491,7 @@ _slang_codegen_global_variable(slang_variable *var, struct gl_program *prog,
        */
       GLint samplerUniform = _mesa_add_sampler(prog->Parameters, varName);
       store = _slang_new_ir_storage(PROGRAM_SAMPLER, samplerUniform, texIndex);
-      printf("SAMPLER ");
+      if (dbg) printf("SAMPLER ");
    }
    else if (var->type.qualifier == slang_qual_uniform) {
       /* Uniform variable */
@@ -506,7 +510,7 @@ _slang_codegen_global_variable(slang_variable *var, struct gl_program *prog,
          store = _slang_new_ir_storage(PROGRAM_STATE_VAR, -1, size);
 
       }
-      printf("UNIFORM ");
+      if (dbg) printf("UNIFORM ");
    }
    else if (var->type.qualifier == slang_qual_varying) {
       const GLint size = 4; /* XXX fix */
@@ -530,9 +534,9 @@ _slang_codegen_global_variable(slang_variable *var, struct gl_program *prog,
             store = _slang_new_ir_storage(PROGRAM_OUTPUT, index, size);
             assert(index < VERT_RESULT_MAX);
          }
-         printf("V/F ");
+         if (dbg) printf("V/F ");
       }
-      printf("VARYING ");
+      if (dbg) printf("VARYING ");
    }
    else if (var->type.qualifier == slang_qual_const) {
       if (prog) {
@@ -543,7 +547,7 @@ _slang_codegen_global_variable(slang_variable *var, struct gl_program *prog,
          GLint size = -1;
          store = _slang_new_ir_storage(PROGRAM_CONSTANT, -1, size);
       }
-      printf("CONST ");
+      if (dbg) printf("CONST ");
    }
    else if (var->type.qualifier == slang_qual_attribute) {
       /* Vertex attribute */
@@ -551,13 +555,13 @@ _slang_codegen_global_variable(slang_variable *var, struct gl_program *prog,
       GLint size = 4; /* XXX? */
       assert(index >= 0);
       store = _slang_new_ir_storage(PROGRAM_INPUT, index, size);
-      printf("ATTRIB ");
+      if (dbg) printf("ATTRIB ");
    }
    else if (var->type.qualifier == slang_qual_fixedinput) {
       GLint index = _slang_input_index(varName, GL_FRAGMENT_PROGRAM_ARB);
       GLint size = 4; /* XXX? */
       store = _slang_new_ir_storage(PROGRAM_INPUT, index, size);
-      printf("INPUT ");
+      if (dbg) printf("INPUT ");
    }
    else if (var->type.qualifier == slang_qual_fixedoutput) {
       if (type == slang_unit_vertex_builtin) {
@@ -571,20 +575,16 @@ _slang_codegen_global_variable(slang_variable *var, struct gl_program *prog,
          GLint size = 4; /* XXX? */
          store = _slang_new_ir_storage(PROGRAM_OUTPUT, index, size);
       }
-      printf("OUTPUT ");
+      if (dbg) printf("OUTPUT ");
    }
    else {
-      printf("other ");
+      if (dbg) printf("other ");
    }
-   printf("GLOBAL VAR %s  idx %d\n", (char*) var->a_name, store?store->Index:-2);
+   if (dbg) printf("GLOBAL VAR %s  idx %d\n", (char*) var->a_name, store?store->Index:-2);
 
    assert(!var->aux);
-#if 1
+
    var->aux = store;
-#endif
-   /**
-      XXX allocate variable storage (aux), at least the register file.
-    */
 }
 
 
@@ -627,9 +627,15 @@ static slang_asm_info AsmInfo[] = {
    { "float_power", IR_POW, 1, 2 },
    /* texture / sampler */
    { "vec4_tex1d", IR_TEX, 1, 1 },
-   { "vec4_texb1d", IR_TEXB, 1, 3 },
+   { "vec4_texb1d", IR_TEXB, 1, 3 },  /* 1d w/ bias */
+   { "vec4_texp1d", IR_TEXP, 1, 2 },  /* 1d w/ projection */
    { "vec4_tex2d", IR_TEX, 1, 2 },
-   { "vec4_texb2d", IR_TEXB, 1, 3 },
+   { "vec4_texb2d", IR_TEXB, 1, 3 },  /* 2d w/ bias */
+   { "vec4_texp2d", IR_TEXP, 1, 2 },  /* 2d w/ projection */
+   { "vec4_tex3d", IR_TEX, 1, 2 },
+   { "vec4_texb3d", IR_TEXB, 1, 3 },  /* 3d w/ bias */
+   { "vec4_texp3d", IR_TEXP, 1, 2 },  /* 3d w/ projection */
+
    /* unary op */
    { "int_to_float", IR_I_TO_F, 1, 1 },
    { "float_exp", IR_EXP, 1, 1 },
diff --git a/src/mesa/shader/slang/slang_emit.c b/src/mesa/shader/slang/slang_emit.c
index 65a356050f..aee3fb2ceb 100644
--- a/src/mesa/shader/slang/slang_emit.c
+++ b/src/mesa/shader/slang/slang_emit.c
@@ -92,6 +92,7 @@ static slang_ir_info IrInfo[] = {
    { IR_VAR_DECL, "IR_VAR_DECL", 0, 0, 0 },
    { IR_TEX, "IR_TEX", OPCODE_TEX, 4, 1 },
    { IR_TEXB, "IR_TEXB", OPCODE_TXB, 4, 2 },
+   { IR_TEXP, "IR_TEXP", OPCODE_TXP, 4, 2 },
    { IR_FLOAT, "IR_FLOAT", 0, 0, 0 },
    { IR_FIELD, "IR_FIELD", 0, 0, 0 },
    { IR_NOP, NULL, OPCODE_NOP, 0, 0 }
@@ -564,10 +565,13 @@ emit_tex(slang_gen_context *gc, slang_ir_node *n, struct gl_program *prog)
    if (n->Opcode == IR_TEX) {
       inst = new_instruction(prog, OPCODE_TEX);
    }
-   else {
-      assert(n->Opcode == IR_TEXB);
+   else if (n->Opcode == IR_TEXB) {
       inst = new_instruction(prog, OPCODE_TXB);
    }
+   else {
+      assert(n->Opcode == IR_TEXP);
+      inst = new_instruction(prog, OPCODE_TXP);
+   }
 
    if (!n->Store)
       slang_alloc_temp_storage(gc, n, 4);
@@ -700,6 +704,7 @@ emit(slang_gen_context *gc, slang_ir_node *n, struct gl_program *prog)
       return emit_unop(gc, n, prog);
    case IR_TEX:
    case IR_TEXB:
+   case IR_TEXP:
       return emit_tex(gc, n, prog);
    case IR_NEG:
       return emit_negation(gc, n, prog);
diff --git a/src/mesa/shader/slang/slang_ir.h b/src/mesa/shader/slang/slang_ir.h
index 0613121b98..273964a8f0 100644
--- a/src/mesa/shader/slang/slang_ir.h
+++ b/src/mesa/shader/slang/slang_ir.h
@@ -81,6 +81,7 @@ typedef enum
    IR_VAR_DECL,/* var declaration */
    IR_TEX,     /* texture lookup */
    IR_TEXB,    /* texture lookup with LOD bias */
+   IR_TEXP,    /* texture lookup with projection */
    IR_FLOAT,
    IR_FIELD,
    IR_I_TO_F
diff --git a/src/mesa/shader/slang/slang_link2.c b/src/mesa/shader/slang/slang_link2.c
index 8b59d7f76a..3a5bce0099 100644
--- a/src/mesa/shader/slang/slang_link2.c
+++ b/src/mesa/shader/slang/slang_link2.c
@@ -257,7 +257,7 @@ link_uniform_vars(struct gl_shader_program *shProg, struct gl_program *prog)
 
       if (inst->Opcode == OPCODE_TEX ||
           inst->Opcode == OPCODE_TXB ||
-          inst->Opcode == OPCODE_TXB) {
+          inst->Opcode == OPCODE_TXP) {
          printf("====== remap sampler from %d to %d\n",
                 inst->Sampler, map[ inst->Sampler ]);
          inst->Sampler = map[ inst->Sampler ];
@@ -328,7 +328,7 @@ _slang_resolve_samplers(struct gl_shader_program *shProg,
       struct prog_instruction *inst = prog->Instructions + i;
       if (inst->Opcode == OPCODE_TEX ||
           inst->Opcode == OPCODE_TXB ||
-          inst->Opcode == OPCODE_TXB) {
+          inst->Opcode == OPCODE_TXP) {
          GLint sampleUnit = (GLint) shProg->Uniforms->ParameterValues[inst->Sampler][0];
          assert(sampleUnit < MAX_TEXTURE_IMAGE_UNITS);
          inst->TexSrcUnit = sampleUnit;