mesa: begin implementation of GL_ARB_draw_buffers_blend

8 files changed, 423 insertions, 188 deletions

diff --git a/src/mesa/main/attrib.c b/src/mesa/main/attrib.c
index adfec3b0d5a..7fd1287368f 100644
--- a/src/mesa/main/attrib.c
+++ b/src/mesa/main/attrib.c
@@ -954,20 +954,39 @@ _mesa_PopAttrib(void)
                      _mesa_set_enable(ctx, GL_BLEND, (color->BlendEnabled & 1));
                   }
                }
-               _mesa_BlendFuncSeparateEXT(color->BlendSrcRGB,
-                                          color->BlendDstRGB,
-                                          color->BlendSrcA,
-                                          color->BlendDstA);
-	       /* This special case is because glBlendEquationSeparateEXT
-		* cannot take GL_LOGIC_OP as a parameter.
-		*/
-	       if ( color->BlendEquationRGB == color->BlendEquationA ) {
-		  _mesa_BlendEquation(color->BlendEquationRGB);
-	       }
-	       else {
-		  _mesa_BlendEquationSeparateEXT(color->BlendEquationRGB,
-						 color->BlendEquationA);
-	       }
+               if (ctx->Color._BlendFuncPerBuffer ||
+                   ctx->Color._BlendEquationPerBuffer) {
+                  /* set blend per buffer */
+                  GLuint buf;
+                  for (buf = 0; buf < ctx->Const.MaxDrawBuffers; buf++) {
+                     _mesa_BlendFuncSeparatei(buf, color->Blend[buf].SrcRGB,
+                                              color->Blend[buf].DstRGB,
+                                              color->Blend[buf].SrcA,
+                                              color->Blend[buf].DstA);
+                     _mesa_BlendEquationSeparatei(buf,
+                                                  color->Blend[buf].EquationRGB,
+                                                  color->Blend[buf].EquationA);
+                  }
+               }
+               else {
+                  /* set same blend modes for all buffers */
+                  _mesa_BlendFuncSeparateEXT(color->Blend[0].SrcRGB,
+                                             color->Blend[0].DstRGB,
+                                             color->Blend[0].SrcA,
+                                             color->Blend[0].DstA);
+                  /* This special case is because glBlendEquationSeparateEXT
+                   * cannot take GL_LOGIC_OP as a parameter.
+                   */
+                  if (color->Blend[0].EquationRGB ==
+                      color->Blend[0].EquationA) {
+                     _mesa_BlendEquation(color->Blend[0].EquationRGB);
+                  }
+                  else {
+                     _mesa_BlendEquationSeparateEXT(
+                                                 color->Blend[0].EquationRGB,
+                                                 color->Blend[0].EquationA);
+                  }
+               }
                _mesa_BlendColor(color->BlendColor[0],
                                 color->BlendColor[1],
                                 color->BlendColor[2],
diff --git a/src/mesa/main/blend.c b/src/mesa/main/blend.c
index ec778b7244d..43e2f7f8617 100644
--- a/src/mesa/main/blend.c
+++ b/src/mesa/main/blend.c
@@ -37,6 +37,110 @@
 #include "mtypes.h"
 
 
+
+/**
+ * Check if given blend source factor is legal.
+ * \return GL_TRUE if legal, GL_FALSE otherwise.
+ */
+static GLboolean
+legal_src_factor(const struct gl_context *ctx, GLenum factor)
+{
+   switch (factor) {
+   case GL_SRC_COLOR:
+   case GL_ONE_MINUS_SRC_COLOR:
+      return ctx->Extensions.NV_blend_square;
+   case GL_ZERO:
+   case GL_ONE:
+   case GL_DST_COLOR:
+   case GL_ONE_MINUS_DST_COLOR:
+   case GL_SRC_ALPHA:
+   case GL_ONE_MINUS_SRC_ALPHA:
+   case GL_DST_ALPHA:
+   case GL_ONE_MINUS_DST_ALPHA:
+   case GL_SRC_ALPHA_SATURATE:
+   case GL_CONSTANT_COLOR:
+   case GL_ONE_MINUS_CONSTANT_COLOR:
+   case GL_CONSTANT_ALPHA:
+   case GL_ONE_MINUS_CONSTANT_ALPHA:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+/**
+ * Check if given blend destination factor is legal.
+ * \return GL_TRUE if legal, GL_FALSE otherwise.
+ */
+static GLboolean
+legal_dst_factor(const struct gl_context *ctx, GLenum factor)
+{
+   switch (factor) {
+   case GL_DST_COLOR:
+   case GL_ONE_MINUS_DST_COLOR:
+      return ctx->Extensions.NV_blend_square;
+   case GL_ZERO:
+   case GL_ONE:
+   case GL_SRC_COLOR:
+   case GL_ONE_MINUS_SRC_COLOR:
+   case GL_SRC_ALPHA:
+   case GL_ONE_MINUS_SRC_ALPHA:
+   case GL_DST_ALPHA:
+   case GL_ONE_MINUS_DST_ALPHA:
+   case GL_CONSTANT_COLOR:
+   case GL_ONE_MINUS_CONSTANT_COLOR:
+   case GL_CONSTANT_ALPHA:
+   case GL_ONE_MINUS_CONSTANT_ALPHA:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
+/**
+ * Check if src/dest RGB/A blend factors are legal.  If not generate
+ * a GL error.
+ * \return GL_TRUE if factors are legal, GL_FALSE otherwise.
+ */
+static GLboolean
+validate_blend_factors(struct gl_context *ctx, const char *func,
+                       GLenum sfactorRGB, GLenum dfactorRGB,
+                       GLenum sfactorA, GLenum dfactorA)
+{
+   if (!legal_src_factor(ctx, sfactorRGB)) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "%s(sfactorRGB = %s)", func,
+                  _mesa_lookup_enum_by_nr(sfactorRGB));
+      return GL_FALSE;
+   }
+
+   if (!legal_dst_factor(ctx, dfactorRGB)) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "%s(dfactorRGB = %s)", func,
+                  _mesa_lookup_enum_by_nr(dfactorRGB));
+      return GL_FALSE;
+   }
+
+   if (sfactorA != sfactorRGB && !legal_src_factor(ctx, sfactorA)) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "%s(sfactorA = %s)", func,
+                  _mesa_lookup_enum_by_nr(sfactorA));
+      return GL_FALSE;
+   }
+
+   if (dfactorA != dfactorRGB && !legal_dst_factor(ctx, dfactorA)) {
+      _mesa_error(ctx, GL_INVALID_ENUM,
+                  "%s(dfactorA = %s)", func,
+                  _mesa_lookup_enum_by_nr(dfactorA));
+      return GL_FALSE;
+   }
+
+   return GL_TRUE;
+}
+
+
 /**
  * Specify the blending operation.
  *
@@ -53,21 +157,19 @@ _mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
 
 
 /**
- * Process GL_EXT_blend_func_separate().
+ * Set the separate blend source/dest factors for all draw buffers.
  *
  * \param sfactorRGB RGB source factor operator.
  * \param dfactorRGB RGB destination factor operator.
  * \param sfactorA alpha source factor operator.
  * \param dfactorA alpha destination factor operator.
- *
- * Verifies the parameters and updates gl_colorbuffer_attrib.
- * On a change, flush the vertices and notify the driver via
- * dd_function_table::BlendFuncSeparate.
  */
 void GLAPIENTRY
 _mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB,
                             GLenum sfactorA, GLenum dfactorA )
 {
+   GLuint buf, numBuffers;
+   GLboolean changed;
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);
 
@@ -78,165 +180,130 @@ _mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB,
                   _mesa_lookup_enum_by_nr(sfactorA),
                   _mesa_lookup_enum_by_nr(dfactorA));
 
-   switch (sfactorRGB) {
-      case GL_SRC_COLOR:
-      case GL_ONE_MINUS_SRC_COLOR:
-         if (!ctx->Extensions.NV_blend_square) {
-            _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (sfactorRGB)");
-            return;
-         }
-         /* fall-through */
-      case GL_ZERO:
-      case GL_ONE:
-      case GL_DST_COLOR:
-      case GL_ONE_MINUS_DST_COLOR:
-      case GL_SRC_ALPHA:
-      case GL_ONE_MINUS_SRC_ALPHA:
-      case GL_DST_ALPHA:
-      case GL_ONE_MINUS_DST_ALPHA:
-      case GL_SRC_ALPHA_SATURATE:
-      case GL_CONSTANT_COLOR:
-      case GL_ONE_MINUS_CONSTANT_COLOR:
-      case GL_CONSTANT_ALPHA:
-      case GL_ONE_MINUS_CONSTANT_ALPHA:
-         break;
-      default:
-         _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (sfactorRGB)");
-         return;
+   if (!validate_blend_factors(ctx, "glBlendFuncSeparate",
+                               sfactorRGB, dfactorRGB,
+                               sfactorA, dfactorA)) {
+      return;
    }
 
-   switch (dfactorRGB) {
-      case GL_DST_COLOR:
-      case GL_ONE_MINUS_DST_COLOR:
-         if (!ctx->Extensions.NV_blend_square) {
-            _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (dfactorRGB)");
-            return;
-         }
-         /* fall-through */
-      case GL_ZERO:
-      case GL_ONE:
-      case GL_SRC_COLOR:
-      case GL_ONE_MINUS_SRC_COLOR:
-      case GL_SRC_ALPHA:
-      case GL_ONE_MINUS_SRC_ALPHA:
-      case GL_DST_ALPHA:
-      case GL_ONE_MINUS_DST_ALPHA:
-      case GL_CONSTANT_COLOR:
-      case GL_ONE_MINUS_CONSTANT_COLOR:
-      case GL_CONSTANT_ALPHA:
-      case GL_ONE_MINUS_CONSTANT_ALPHA:
+   numBuffers = ctx->Extensions.ARB_draw_buffers_blend
+      ? ctx->Const.MaxDrawBuffers : 1;
+
+   changed = GL_FALSE;
+   for (buf = 0; buf < numBuffers; buf++) {
+      if (ctx->Color.Blend[buf].SrcRGB != sfactorRGB ||
+          ctx->Color.Blend[buf].DstRGB != dfactorRGB ||
+          ctx->Color.Blend[buf].SrcA != sfactorA ||
+          ctx->Color.Blend[buf].DstA != dfactorA) {
+         changed = GL_TRUE;
          break;
-      default:
-         _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (dfactorRGB)");
-         return;
+      }
    }
+   if (!changed)
+      return;
 
-   switch (sfactorA) {
-      case GL_SRC_COLOR:
-      case GL_ONE_MINUS_SRC_COLOR:
-         if (!ctx->Extensions.NV_blend_square) {
-            _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (sfactorA)");
-            return;
-         }
-         /* fall-through */
-      case GL_ZERO:
-      case GL_ONE:
-      case GL_DST_COLOR:
-      case GL_ONE_MINUS_DST_COLOR:
-      case GL_SRC_ALPHA:
-      case GL_ONE_MINUS_SRC_ALPHA:
-      case GL_DST_ALPHA:
-      case GL_ONE_MINUS_DST_ALPHA:
-      case GL_SRC_ALPHA_SATURATE:
-      case GL_CONSTANT_COLOR:
-      case GL_ONE_MINUS_CONSTANT_COLOR:
-      case GL_CONSTANT_ALPHA:
-      case GL_ONE_MINUS_CONSTANT_ALPHA:
-         break;
-      default:
-         _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (sfactorA)");
-         return;
+   FLUSH_VERTICES(ctx, _NEW_COLOR);
+
+   for (buf = 0; buf < numBuffers; buf++) {
+      ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
+      ctx->Color.Blend[buf].DstRGB = dfactorRGB;
+      ctx->Color.Blend[buf].SrcA = sfactorA;
+      ctx->Color.Blend[buf].DstA = dfactorA;
    }
+   ctx->Color._BlendFuncPerBuffer = GL_FALSE;
 
-   switch (dfactorA) {
-      case GL_DST_COLOR:
-      case GL_ONE_MINUS_DST_COLOR:
-         if (!ctx->Extensions.NV_blend_square) {
-            _mesa_error(ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (dfactorA)");
-            return;
-         }
-         /* fall-through */
-      case GL_ZERO:
-      case GL_ONE:
-      case GL_SRC_COLOR:
-      case GL_ONE_MINUS_SRC_COLOR:
-      case GL_SRC_ALPHA:
-      case GL_ONE_MINUS_SRC_ALPHA:
-      case GL_DST_ALPHA:
-      case GL_ONE_MINUS_DST_ALPHA:
-      case GL_CONSTANT_COLOR:
-      case GL_ONE_MINUS_CONSTANT_COLOR:
-      case GL_CONSTANT_ALPHA:
-      case GL_ONE_MINUS_CONSTANT_ALPHA:
-         break;
-      default:
-         _mesa_error( ctx, GL_INVALID_ENUM, "glBlendFunc or glBlendFuncSeparate (dfactorA)" );
-         return;
+   if (ctx->Driver.BlendFuncSeparate) {
+      ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
+                                    sfactorA, dfactorA);
    }
+}
+
 
-   if (ctx->Color.BlendSrcRGB == sfactorRGB &&
-       ctx->Color.BlendDstRGB == dfactorRGB &&
-       ctx->Color.BlendSrcA == sfactorA &&
-       ctx->Color.BlendDstA == dfactorA)
+#if _HAVE_FULL_GL
+
+
+/**
+ * Set blend source/dest factors for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendFunci(GLuint buf, GLenum sfactor, GLenum dfactor)
+{
+   _mesa_BlendFuncSeparatei(buf, sfactor, dfactor, sfactor, dfactor);
+}
+
+
+/**
+ * Set separate blend source/dest factors for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendFuncSeparatei(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB,
+                         GLenum sfactorA, GLenum dfactorA)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (!ctx->Extensions.ARB_draw_buffers_blend) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "glBlendFunc[Separate]i()");
+      return;
+   }
+
+   if (buf >= ctx->Const.MaxDrawBuffers) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
+                  buf);
       return;
+   }
+
+   if (!validate_blend_factors(ctx, "glBlendFuncSeparatei",
+                               sfactorRGB, dfactorRGB,
+                               sfactorA, dfactorA)) {
+      return;
+   }
+
+   if (ctx->Color.Blend[buf].SrcRGB == sfactorRGB &&
+       ctx->Color.Blend[buf].DstRGB == dfactorRGB &&
+       ctx->Color.Blend[buf].SrcA == sfactorA &&
+       ctx->Color.Blend[buf].DstA == dfactorA)
+      return; /* no change */
 
    FLUSH_VERTICES(ctx, _NEW_COLOR);
 
-   ctx->Color.BlendSrcRGB = sfactorRGB;
-   ctx->Color.BlendDstRGB = dfactorRGB;
-   ctx->Color.BlendSrcA = sfactorA;
-   ctx->Color.BlendDstA = dfactorA;
+   ctx->Color.Blend[buf].SrcRGB = sfactorRGB;
+   ctx->Color.Blend[buf].DstRGB = dfactorRGB;
+   ctx->Color.Blend[buf].SrcA = sfactorA;
+   ctx->Color.Blend[buf].DstA = dfactorA;
+   ctx->Color._BlendFuncPerBuffer = GL_TRUE;
 
-   if (ctx->Driver.BlendFuncSeparate) {
-      (*ctx->Driver.BlendFuncSeparate)( ctx, sfactorRGB, dfactorRGB,
-					sfactorA, dfactorA );
+   if (ctx->Driver.BlendFuncSeparatei) {
+      ctx->Driver.BlendFuncSeparatei(ctx, buf, sfactorRGB, dfactorRGB,
+                                     sfactorA, dfactorA);
    }
 }
 
 
-#if _HAVE_FULL_GL
-
+/**
+ * Check if given blend equation is legal.
+ * \return GL_TRUE if legal, GL_FALSE otherwise.
+ */
 static GLboolean
-_mesa_validate_blend_equation( struct gl_context *ctx,
-			       GLenum mode, GLboolean is_separate )
+legal_blend_equation(const struct gl_context *ctx,
+                     GLenum mode, GLboolean is_separate)
 {
    switch (mode) {
-      case GL_FUNC_ADD:
-         break;
-      case GL_MIN:
-      case GL_MAX:
-         if (!ctx->Extensions.EXT_blend_minmax) {
-            return GL_FALSE;
-         }
-         break;
+   case GL_FUNC_ADD:
+      return GL_TRUE;
+   case GL_MIN:
+   case GL_MAX:
+      return ctx->Extensions.EXT_blend_minmax;
+   case GL_LOGIC_OP:
       /* glBlendEquationSeparate cannot take GL_LOGIC_OP as a parameter.
        */
-      case GL_LOGIC_OP:
-         if (!ctx->Extensions.EXT_blend_logic_op || is_separate) {
-            return GL_FALSE;
-         }
-         break;
-      case GL_FUNC_SUBTRACT:
-      case GL_FUNC_REVERSE_SUBTRACT:
-         if (!ctx->Extensions.EXT_blend_subtract) {
-            return GL_FALSE;
-         }
-         break;
-      default:
-         return GL_FALSE;
+      return ctx->Extensions.EXT_blend_logic_op && !is_separate;
+   case GL_FUNC_SUBTRACT:
+   case GL_FUNC_REVERSE_SUBTRACT:
+      return ctx->Extensions.EXT_blend_subtract;
+   default:
+      return GL_FALSE;
    }
-
-   return GL_TRUE;
 }
 
 
@@ -244,6 +311,8 @@ _mesa_validate_blend_equation( struct gl_context *ctx,
 void GLAPIENTRY
 _mesa_BlendEquation( GLenum mode )
 {
+   GLuint buf, numBuffers;
+   GLboolean changed;
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);
 
@@ -251,27 +320,80 @@ _mesa_BlendEquation( GLenum mode )
       _mesa_debug(ctx, "glBlendEquation %s\n",
                   _mesa_lookup_enum_by_nr(mode));
 
-   if ( ! _mesa_validate_blend_equation( ctx, mode, GL_FALSE ) ) {
+   if (!legal_blend_equation(ctx, mode, GL_FALSE)) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
       return;
    }
 
-   if ( (ctx->Color.BlendEquationRGB == mode) &&
-	(ctx->Color.BlendEquationA == mode) )
+   numBuffers = ctx->Extensions.ARB_draw_buffers_blend
+      ? ctx->Const.MaxDrawBuffers : 1;
+
+   changed = GL_FALSE;
+   for (buf = 0; buf < numBuffers; buf++) {
+      if (ctx->Color.Blend[buf].EquationRGB != mode ||
+          ctx->Color.Blend[buf].EquationA != mode) {
+         changed = GL_TRUE;
+         break;
+      }
+   }
+   if (!changed)
       return;
 
    FLUSH_VERTICES(ctx, _NEW_COLOR);
-   ctx->Color.BlendEquationRGB = mode;
-   ctx->Color.BlendEquationA = mode;
+   for (buf = 0; buf < numBuffers; buf++) {
+      ctx->Color.Blend[buf].EquationRGB = mode;
+      ctx->Color.Blend[buf].EquationA = mode;
+   }
+   ctx->Color._BlendEquationPerBuffer = GL_FALSE;
 
    if (ctx->Driver.BlendEquationSeparate)
       (*ctx->Driver.BlendEquationSeparate)( ctx, mode, mode );
 }
 
 
+/**
+ * Set blend equation for one color buffer/target.
+ */
+void GLAPIENTRY
+_mesa_BlendEquationi(GLuint buf, GLenum mode)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glBlendEquationi(%u, %s)\n",
+                  buf, _mesa_lookup_enum_by_nr(mode));
+
+   if (buf >= ctx->Const.MaxDrawBuffers) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBlendFuncSeparatei(buffer=%u)",
+                  buf);
+      return;
+   }
+
+   if (!legal_blend_equation(ctx, mode, GL_FALSE)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationi");
+      return;
+   }
+
+   if (ctx->Color.Blend[buf].EquationRGB == mode &&
+       ctx->Color.Blend[buf].EquationA == mode)
+      return;  /* no change */
+
+   FLUSH_VERTICES(ctx, _NEW_COLOR);
+   ctx->Color.Blend[buf].EquationRGB = mode;
+   ctx->Color.Blend[buf].EquationA = mode;
+   ctx->Color._BlendEquationPerBuffer = GL_TRUE;
+
+   if (ctx->Driver.BlendEquationSeparatei)
+      ctx->Driver.BlendEquationSeparatei(ctx, buf, mode, mode);
+}
+
+
 void GLAPIENTRY
 _mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA )
 {
+   GLuint buf, numBuffers;
+   GLboolean changed;
    GET_CURRENT_CONTEXT(ctx);
    ASSERT_OUTSIDE_BEGIN_END(ctx);
 
@@ -286,29 +408,88 @@ _mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA )
       return;
    }
 
-   if ( ! _mesa_validate_blend_equation( ctx, modeRGB, GL_TRUE ) ) {
+   if (!legal_blend_equation(ctx, modeRGB, GL_TRUE)) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeRGB)");
       return;
    }
 
-   if ( ! _mesa_validate_blend_equation( ctx, modeA, GL_TRUE ) ) {
+   if (!legal_blend_equation(ctx, modeA, GL_TRUE)) {
       _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparateEXT(modeA)");
       return;
    }
 
+   numBuffers = ctx->Extensions.ARB_draw_buffers_blend
+      ? ctx->Const.MaxDrawBuffers : 1;
 
-   if ( (ctx->Color.BlendEquationRGB == modeRGB) &&
-	(ctx->Color.BlendEquationA == modeA) )
+   changed = GL_FALSE;
+   for (buf = 0; buf < numBuffers; buf++) {
+      if (ctx->Color.Blend[buf].EquationRGB != modeRGB ||
+          ctx->Color.Blend[buf].EquationA != modeA) {
+         changed = GL_TRUE;
+         break;
+      }
+   }
+   if (!changed)
       return;
 
    FLUSH_VERTICES(ctx, _NEW_COLOR);
-   ctx->Color.BlendEquationRGB = modeRGB;
-   ctx->Color.BlendEquationA = modeA;
+   for (buf = 0; buf < numBuffers; buf++) {
+      ctx->Color.Blend[buf].EquationRGB = modeRGB;
+      ctx->Color.Blend[buf].EquationA = modeA;
+   }
+   ctx->Color._BlendEquationPerBuffer = GL_FALSE;
 
    if (ctx->Driver.BlendEquationSeparate)
-      (*ctx->Driver.BlendEquationSeparate)( ctx, modeRGB, modeA );
+      ctx->Driver.BlendEquationSeparate(ctx, modeRGB, modeA);
 }
-#endif
+
+
+/**
+ * Set separate blend equations for one color buffer/target.
+ */
+void
+_mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (MESA_VERBOSE & VERBOSE_API)
+      _mesa_debug(ctx, "glBlendEquationSeparatei %u, %s %s\n", buf,
+                  _mesa_lookup_enum_by_nr(modeRGB),
+                  _mesa_lookup_enum_by_nr(modeA));
+
+   if (buf >= ctx->Const.MaxDrawBuffers) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBlendEquationSeparatei(buffer=%u)",
+                  buf);
+      return;
+   }
+
+   if (!legal_blend_equation(ctx, modeRGB, GL_TRUE)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeRGB)");
+      return;
+   }
+
+   if (!legal_blend_equation(ctx, modeA, GL_TRUE)) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquationSeparatei(modeA)");
+      return;
+   }
+
+   if (ctx->Color.Blend[buf].EquationRGB == modeRGB &&
+       ctx->Color.Blend[buf].EquationA == modeA)
+      return;  /* no change */
+
+   FLUSH_VERTICES(ctx, _NEW_COLOR);
+   ctx->Color.Blend[buf].EquationRGB = modeRGB;
+   ctx->Color.Blend[buf].EquationA = modeA;
+   ctx->Color._BlendEquationPerBuffer = GL_TRUE;
+
+   if (ctx->Driver.BlendEquationSeparatei)
+      ctx->Driver.BlendEquationSeparatei(ctx, buf, modeRGB, modeA);
+}
+
+
+
+#endif /* _HAVE_FULL_GL */
 
 
 /**
@@ -593,6 +774,8 @@ _mesa_ClampColorARB(GLenum target, GLenum clamp)
  */
 void _mesa_init_color( struct gl_context * ctx )
 {
+   GLuint i;
+
    /* Color buffer group */
    ctx->Color.IndexMask = ~0u;
    memset(ctx->Color.ColorMask, 0xff, sizeof(ctx->Color.ColorMask));
@@ -602,12 +785,14 @@ void _mesa_init_color( struct gl_context * ctx )
    ctx->Color.AlphaFunc = GL_ALWAYS;
    ctx->Color.AlphaRef = 0;
    ctx->Color.BlendEnabled = 0x0;
-   ctx->Color.BlendSrcRGB = GL_ONE;
-   ctx->Color.BlendDstRGB = GL_ZERO;
-   ctx->Color.BlendSrcA = GL_ONE;
-   ctx->Color.BlendDstA = GL_ZERO;
-   ctx->Color.BlendEquationRGB = GL_FUNC_ADD;
-   ctx->Color.BlendEquationA = GL_FUNC_ADD;
+   for (i = 0; i < Elements(ctx->Color.Blend); i++) {
+      ctx->Color.Blend[i].SrcRGB = GL_ONE;
+      ctx->Color.Blend[i].DstRGB = GL_ZERO;
+      ctx->Color.Blend[i].SrcA = GL_ONE;
+      ctx->Color.Blend[i].DstA = GL_ZERO;
+      ctx->Color.Blend[i].EquationRGB = GL_FUNC_ADD;
+      ctx->Color.Blend[i].EquationA = GL_FUNC_ADD;
+   }
    ASSIGN_4V( ctx->Color.BlendColor, 0.0, 0.0, 0.0, 0.0 );
    ctx->Color.IndexLogicOpEnabled = GL_FALSE;
    ctx->Color.ColorLogicOpEnabled = GL_FALSE;
diff --git a/src/mesa/main/blend.h b/src/mesa/main/blend.h
index f72c779f1aa..39e7c9fd49b 100644
--- a/src/mesa/main/blend.h
+++ b/src/mesa/main/blend.h
@@ -48,13 +48,30 @@ _mesa_BlendFuncSeparateEXT( GLenum sfactorRGB, GLenum dfactorRGB,
 
 
 extern void GLAPIENTRY
+_mesa_BlendFunci(GLuint buf, GLenum sfactor, GLenum dfactor);
+
+
+extern void GLAPIENTRY
+_mesa_BlendFuncSeparatei(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB,
+                         GLenum sfactorA, GLenum dfactorA);
+
+
+extern void GLAPIENTRY
 _mesa_BlendEquation( GLenum mode );
 
 
 extern void GLAPIENTRY
+_mesa_BlendEquationi(GLuint buf, GLenum mode);
+
+
+extern void GLAPIENTRY
 _mesa_BlendEquationSeparateEXT( GLenum modeRGB, GLenum modeA );
 
 
+extern void
+_mesa_BlendEquationSeparatei(GLuint buf, GLenum modeRGB, GLenum modeA);
+
+
 extern void GLAPIENTRY
 _mesa_BlendColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
 
diff --git a/src/mesa/main/context.h b/src/mesa/main/context.h
index 42d98a33a8d..8fb9b4c6b7a 100644
--- a/src/mesa/main/context.h
+++ b/src/mesa/main/context.h
@@ -320,7 +320,7 @@ do {									\
  */
 #define RGBA_LOGICOP_ENABLED(CTX) \
   ((CTX)->Color.ColorLogicOpEnabled || \
-   ((CTX)->Color.BlendEnabled && (CTX)->Color.BlendEquationRGB == GL_LOGIC_OP))
+   ((CTX)->Color.BlendEnabled && (CTX)->Color.Blend[0].EquationRGB == GL_LOGIC_OP))
 
 
 #endif /* CONTEXT_H */
diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index c62969e9b7e..2eede4268ca 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -635,10 +635,15 @@ struct dd_function_table {
    void (*BlendColor)(struct gl_context *ctx, const GLfloat color[4]);
    /** Set the blend equation */
    void (*BlendEquationSeparate)(struct gl_context *ctx, GLenum modeRGB, GLenum modeA);
+   void (*BlendEquationSeparatei)(struct gl_context *ctx, GLuint buffer,
+                                  GLenum modeRGB, GLenum modeA);
    /** Specify pixel arithmetic */
    void (*BlendFuncSeparate)(struct gl_context *ctx,
                              GLenum sfactorRGB, GLenum dfactorRGB,
                              GLenum sfactorA, GLenum dfactorA);
+   void (*BlendFuncSeparatei)(struct gl_context *ctx, GLuint buffer,
+                              GLenum sfactorRGB, GLenum dfactorRGB,
+                              GLenum sfactorA, GLenum dfactorA);
    /** Specify clear values for the color buffers */
    void (*ClearColor)(struct gl_context *ctx, const GLfloat color[4]);
    /** Specify the clear value for the depth buffer */
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 24404993c69..8ca1339c66a 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -80,6 +80,7 @@ static const struct extension extension_table[] = {
    { "GL_ARB_depth_clamp",                         o(ARB_depth_clamp),                         GL             },
    { "GL_ARB_depth_texture",                       o(ARB_depth_texture),                       GL             },
    { "GL_ARB_draw_buffers",                        o(ARB_draw_buffers),                        GL             },
+   { "GL_ARB_draw_buffers_blend",                  o(ARB_draw_buffers_blend),                  GL             },
    { "GL_ARB_draw_elements_base_vertex",           o(ARB_draw_elements_base_vertex),           GL             },
    { "GL_ARB_draw_instanced",                      o(ARB_draw_instanced),                      GL             },
    { "GL_ARB_explicit_attrib_location",            o(ARB_explicit_attrib_location),            GL             },
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index ba273cef461..6f47eca28cc 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -372,7 +372,7 @@ static const struct value_desc values[] = {
      API_OPENGL_BIT | API_OPENGLES_BIT | API_OPENGLES2_BIT, NO_EXTRA},
    { GL_ALPHA_BITS, BUFFER_INT(Visual.alphaBits), extra_new_buffers },
    { GL_BLEND, CONTEXT_BIT0(Color.BlendEnabled), NO_EXTRA },
-   { GL_BLEND_SRC, CONTEXT_ENUM(Color.BlendSrcRGB), NO_EXTRA },
+   { GL_BLEND_SRC, CONTEXT_ENUM(Color.Blend[0].SrcRGB), NO_EXTRA },
    { GL_BLUE_BITS, BUFFER_INT(Visual.blueBits), extra_new_buffers },
    { GL_COLOR_CLEAR_VALUE, CONTEXT_FIELD(Color.ClearColor[0], TYPE_FLOATN_4), NO_EXTRA },
    { GL_COLOR_WRITEMASK, LOC_CUSTOM, TYPE_INT_4, 0, NO_EXTRA },
@@ -435,15 +435,15 @@ static const struct value_desc values[] = {
      extra_ARB_texture_cube_map }, /* XXX: OES_texture_cube_map */
 
    /* XXX: OES_blend_subtract */
-   { GL_BLEND_SRC_RGB_EXT, CONTEXT_ENUM(Color.BlendSrcRGB), NO_EXTRA },
-   { GL_BLEND_DST_RGB_EXT, CONTEXT_ENUM(Color.BlendDstRGB), NO_EXTRA },
-   { GL_BLEND_SRC_ALPHA_EXT, CONTEXT_ENUM(Color.BlendSrcA), NO_EXTRA },
-   { GL_BLEND_DST_ALPHA_EXT, CONTEXT_ENUM(Color.BlendDstA), NO_EXTRA },
+   { GL_BLEND_SRC_RGB_EXT, CONTEXT_ENUM(Color.Blend[0].SrcRGB), NO_EXTRA },
+   { GL_BLEND_DST_RGB_EXT, CONTEXT_ENUM(Color.Blend[0].DstRGB), NO_EXTRA },
+   { GL_BLEND_SRC_ALPHA_EXT, CONTEXT_ENUM(Color.Blend[0].SrcA), NO_EXTRA },
+   { GL_BLEND_DST_ALPHA_EXT, CONTEXT_ENUM(Color.Blend[0].DstA), NO_EXTRA },
 
    /* GL_BLEND_EQUATION_RGB, which is what we're really after, is
     * defined identically to GL_BLEND_EQUATION. */
-   { GL_BLEND_EQUATION, CONTEXT_ENUM(Color.BlendEquationRGB), NO_EXTRA },
-   { GL_BLEND_EQUATION_ALPHA_EXT, CONTEXT_ENUM(Color.BlendEquationA), NO_EXTRA },
+   { GL_BLEND_EQUATION, CONTEXT_ENUM(Color.Blend[0].EquationRGB), NO_EXTRA },
+   { GL_BLEND_EQUATION_ALPHA_EXT, CONTEXT_ENUM(Color.Blend[0].EquationA), NO_EXTRA },
 
    /* GL_ARB_texture_compression */
    { GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB, LOC_CUSTOM, TYPE_INT, 0, NO_EXTRA },
@@ -512,7 +512,7 @@ static const struct value_desc values[] = {
    { GL_ALPHA_TEST, CONTEXT_BOOL(Color.AlphaEnabled), NO_EXTRA },
    { GL_ALPHA_TEST_FUNC, CONTEXT_ENUM(Color.AlphaFunc), NO_EXTRA },
    { GL_ALPHA_TEST_REF, CONTEXT_FIELD(Color.AlphaRef, TYPE_FLOATN), NO_EXTRA },
-   { GL_BLEND_DST, CONTEXT_ENUM(Color.BlendDstRGB), NO_EXTRA },
+   { GL_BLEND_DST, CONTEXT_ENUM(Color.Blend[0].DstRGB), NO_EXTRA },
    { GL_CLIP_PLANE0, CONTEXT_BIT0(Transform.ClipPlanesEnabled), NO_EXTRA },
    { GL_CLIP_PLANE1, CONTEXT_BIT1(Transform.ClipPlanesEnabled), NO_EXTRA },
    { GL_CLIP_PLANE2, CONTEXT_BIT2(Transform.ClipPlanesEnabled), NO_EXTRA },
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 7b4c1161f5a..55c5fd2b849 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -719,13 +719,20 @@ struct gl_colorbuffer_attrib
     */
    /*@{*/
    GLbitfield BlendEnabled;		/**< Per-buffer blend enable flags */
-   GLenum BlendSrcRGB;			/**< Blending source operator */
-   GLenum BlendDstRGB;			/**< Blending destination operator */
-   GLenum BlendSrcA;			/**< GL_INGR_blend_func_separate */
-   GLenum BlendDstA;			/**< GL_INGR_blend_func_separate */
-   GLenum BlendEquationRGB;		/**< Blending equation */
-   GLenum BlendEquationA;		/**< GL_EXT_blend_equation_separate */
    GLfloat BlendColor[4];		/**< Blending color */
+   struct
+   {
+      GLenum SrcRGB;             /**< RGB blend source term */
+      GLenum DstRGB;             /**< RGB blend dest term */
+      GLenum SrcA;               /**< Alpha blend source term */
+      GLenum DstA;               /**< Alpha blend dest term */
+      GLenum EquationRGB;        /**< GL_ADD, GL_SUBTRACT, etc. */
+      GLenum EquationA;          /**< GL_ADD, GL_SUBTRACT, etc. */
+   } Blend[MAX_DRAW_BUFFERS];
+   /** Are the blend func terms currently different for each buffer/target? */
+   GLboolean _BlendFuncPerBuffer;
+   /** Are the blend equations currently different for each buffer/target? */
+   GLboolean _BlendEquationPerBuffer;
    /*@}*/
 
    /** 
@@ -2679,6 +2686,7 @@ struct gl_extensions
    GLboolean ARB_depth_clamp;
    GLboolean ARB_depth_texture;
    GLboolean ARB_draw_buffers;
+   GLboolean ARB_draw_buffers_blend;
    GLboolean ARB_draw_elements_base_vertex;
    GLboolean ARB_draw_instanced;
    GLboolean ARB_fragment_coord_conventions;