Implement blend state

3 files changed, 204 insertions, 0 deletions

diff --git a/src/mesa/softpipe/state_tracker/st_atom.c b/src/mesa/softpipe/state_tracker/st_atom.c
index 1eb5c86e46..5f426f040a 100644
--- a/src/mesa/softpipe/state_tracker/st_atom.c
+++ b/src/mesa/softpipe/state_tracker/st_atom.c
@@ -48,6 +48,7 @@ static const struct st_tracked_state *atoms[] =
    &st_update_setup,
    &st_update_viewport,
    &st_update_scissor,
+   &st_update_blend,
    /* will be patched out at runtime */
 /*    &st_update_constants */
 };
diff --git a/src/mesa/softpipe/state_tracker/st_atom.h b/src/mesa/softpipe/state_tracker/st_atom.h
index ee3d36a00c..dc8397adce 100644
--- a/src/mesa/softpipe/state_tracker/st_atom.h
+++ b/src/mesa/softpipe/state_tracker/st_atom.h
@@ -51,6 +51,7 @@ const struct st_tracked_state st_update_setup;
 const struct st_tracked_state st_update_viewport;
 const struct st_tracked_state st_update_constants;
 const struct st_tracked_state st_update_scissor;
+const struct st_tracked_state st_update_blend;
 
 
 #endif
diff --git a/src/mesa/softpipe/state_tracker/st_atom_blend.c b/src/mesa/softpipe/state_tracker/st_atom_blend.c
new file mode 100644
index 0000000000..eabb9172ba
--- /dev/null
+++ b/src/mesa/softpipe/state_tracker/st_atom_blend.c
@@ -0,0 +1,202 @@
+/**************************************************************************
+ * 
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * 
+ **************************************************************************/
+
+ /*
+  * Authors:
+  *   Keith Whitwell <keith@tungstengraphics.com>
+  *   Brian Paul
+  */
+ 
+
+#include "st_context.h"
+#include "st_atom.h"
+#include "softpipe/sp_context.h"
+#include "softpipe/sp_defines.h"
+
+
+/**
+ * Convert GLenum blend tokens to softpipe tokens.
+ * Both blend factors and blend funcs are accepted.
+ */
+static GLuint
+gl_blend_to_sp(GLenum blend)
+{
+   switch (blend) {
+   /* blend functions */
+   case GL_FUNC_ADD:
+      return SP_BLEND_ADD;
+   case GL_FUNC_SUBTRACT:
+      return SP_BLEND_SUBTRACT;
+   case GL_FUNC_REVERSE_SUBTRACT:
+      return SP_BLEND_REVERSE_SUBTRACT;
+   case GL_MIN:
+      return SP_BLEND_MIN;
+   case GL_MAX:
+      return SP_BLEND_MAX;
+
+   /* blend factors */
+   case GL_ONE:
+      return SP_BLENDFACTOR_ONE;
+   case GL_SRC_COLOR:
+      return SP_BLENDFACTOR_SRC_COLOR;
+   case GL_SRC_ALPHA:
+      return SP_BLENDFACTOR_SRC_ALPHA;
+   case GL_DST_ALPHA:
+      return SP_BLENDFACTOR_DST_ALPHA;
+   case GL_DST_COLOR:
+      return SP_BLENDFACTOR_DST_COLOR;
+   case GL_SRC_ALPHA_SATURATE:
+      return SP_BLENDFACTOR_SRC_ALPHA_SATURATE;
+   case GL_CONSTANT_COLOR:
+      return SP_BLENDFACTOR_CONST_COLOR;
+   case GL_CONSTANT_ALPHA:
+      return SP_BLENDFACTOR_CONST_ALPHA;
+      /*
+      return SP_BLENDFACTOR_SRC1_COLOR;
+      return SP_BLENDFACTOR_SRC1_ALPHA;
+      */
+   case GL_ZERO:
+      return SP_BLENDFACTOR_ZERO;
+   case GL_ONE_MINUS_SRC_COLOR:
+      return SP_BLENDFACTOR_INV_SRC_COLOR;
+   case GL_ONE_MINUS_SRC_ALPHA:
+      return SP_BLENDFACTOR_INV_SRC_ALPHA;
+   case GL_ONE_MINUS_DST_COLOR:
+      return SP_BLENDFACTOR_INV_DST_ALPHA;
+   case GL_ONE_MINUS_DST_ALPHA:
+      return SP_BLENDFACTOR_INV_DST_COLOR;
+   case GL_ONE_MINUS_CONSTANT_COLOR:
+      return SP_BLENDFACTOR_INV_CONST_COLOR;
+   case GL_ONE_MINUS_CONSTANT_ALPHA:
+      return SP_BLENDFACTOR_INV_CONST_ALPHA;
+      /*
+      return SP_BLENDFACTOR_INV_SRC1_COLOR;
+      return SP_BLENDFACTOR_INV_SRC1_ALPHA;
+      */
+   default:
+      assert("invalid GL token in gl_blend_to_sp()" == NULL);
+      return 0;
+   }
+}
+
+
+/**
+ * Convert GLenum logicop tokens to softpipe tokens.
+ */
+static GLuint
+gl_logicop_to_sp(GLenum logicop)
+{
+   switch (logicop) {
+   case GL_CLEAR:
+      return SP_LOGICOP_CLEAR;
+   case GL_NOR:
+      return SP_LOGICOP_NOR;
+   case GL_AND_INVERTED:
+      return SP_LOGICOP_AND_INVERTED;
+   case GL_COPY_INVERTED:
+      return SP_LOGICOP_COPY_INVERTED;
+   case GL_AND_REVERSE:
+      return SP_LOGICOP_AND_REVERSE;
+   case GL_INVERT:
+      return SP_LOGICOP_INVERT;
+   case GL_XOR:
+      return SP_LOGICOP_XOR;
+   case GL_NAND:
+      return SP_LOGICOP_NAND;
+   case GL_AND:
+      return SP_LOGICOP_AND;
+   case GL_EQUIV:
+      return SP_LOGICOP_EQUIV;
+   case GL_NOOP:
+      return SP_LOGICOP_NOOP;
+   case GL_OR_INVERTED:
+      return SP_LOGICOP_OR_INVERTED;
+   case GL_COPY:
+      return SP_LOGICOP_COPY;
+   case GL_OR_REVERSE:
+      return SP_LOGICOP_OR_REVERSE;
+   case GL_OR:
+      return SP_LOGICOP_OR;
+   case GL_SET:
+      return SP_LOGICOP_SET;
+   default:
+      assert("invalid GL token in gl_logicop_to_sp()" == NULL);
+      return 0;
+   }
+}
+
+
+static void 
+update_blend( struct st_context *st )
+{
+   struct softpipe_blend_state blend;
+
+   memset(&blend, 0, sizeof(blend));
+
+   if (st->ctx->Color.ColorLogicOpEnabled ||
+       (st->ctx->Color.BlendEnabled &&
+        st->ctx->Color.BlendEquationRGB == GL_LOGIC_OP)) {
+      /* logicop enabled */
+      blend.logicop_enable = 1;
+      blend.logicop_func = gl_logicop_to_sp(st->ctx->Color.LogicOp);
+   }
+   else if (st->ctx->Color.BlendEnabled) {
+      /* blending enabled */
+      blend.blend_enable = 1;
+
+      blend.rgb_func = gl_blend_to_sp(st->ctx->Color.BlendEquationRGB);
+      blend.rgb_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcRGB);
+      blend.rgb_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstRGB);
+
+      blend.alpha_func = gl_blend_to_sp(st->ctx->Color.BlendEquationA);
+      blend.alpha_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcA);
+      blend.alpha_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstA);
+   }
+   else {
+      /* no blending / logicop */
+   }
+
+   if (memcmp(&blend, &st->state.blend, sizeof(blend)) != 0) {
+      /* state has changed */
+      st->state.blend = blend;  /* struct copy */
+      st->softpipe->set_blend_state(st->softpipe, &blend); /* set new state */
+   }
+}
+
+
+const struct st_tracked_state st_update_blend = {
+   .dirty = {
+      .mesa = (_NEW_COLOR),  /* XXX _NEW_BLEND someday? */
+      .st  = 0,
+   },
+   .update = update_blend
+};
+
+
+
+
+