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mesa: add support for ARB_blend_func_extended (v4)

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Add implementations of the two API functions,
Add a new strings to uint mapping for index bindings
Add the blending mode validation for SRC1 + SRC_ALPHA_SATURATE
Add get for MAX_DUAL_SOURCE_DRAW_BUFFERS

v2:
Add check in valid_to_render to address case in spec ERRORS.

v3:
Add index to ir.h so this patch compiles on its own
fixup comment

v4: fixup Brian's comments

The GLSL patch will setup the indices.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2012-03-24 13:33:00 +00:00
parent a75c6163e6
commit f8cf79936b
9 changed files with 154 additions and 6 deletions
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36
src/mesa/main/context.c
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@@ -1695,7 +1695,39 @@ _mesa_set_mvp_with_dp4( struct gl_context *ctx,
ctx->mvp_with_dp4 = flag;
}
static GLboolean
blend_factor_is_dual_src(GLenum factor)
{
return factor == GL_SRC1_COLOR || factor == GL_SRC1_ALPHA ||
factor == GL_ONE_MINUS_SRC1_COLOR || factor == GL_ONE_MINUS_SRC1_ALPHA;
}
/*
* ARB_blend_func_extended - ERRORS section
* "The error INVALID_OPERATION is generated by Begin or any procedure that
* implicitly calls Begin if any draw buffer has a blend function requiring the
* second color input (SRC1_COLOR, ONE_MINUS_SRC1_COLOR, SRC1_ALPHA or
* ONE_MINUS_SRC1_ALPHA), and a framebuffer is bound that has more than
* the value of MAX_DUAL_SOURCE_DRAW_BUFFERS-1 active color attachements."
*/
static GLboolean
_mesa_check_blend_func_error(struct gl_context *ctx)
{
GLuint i;
for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
if (blend_factor_is_dual_src(ctx->Color.Blend[i].SrcRGB) ||
blend_factor_is_dual_src(ctx->Color.Blend[i].DstRGB) ||
blend_factor_is_dual_src(ctx->Color.Blend[i].SrcA) ||
blend_factor_is_dual_src(ctx->Color.Blend[i].DstA)) {
if (i >= ctx->Const.MaxDualSourceDrawBuffers) {
_mesa_error(ctx, GL_INVALID_OPERATION,
"dual source blend on illegal attachment");
return GL_FALSE;
}
}
}
return GL_TRUE;
}
/**
* Prior to drawing anything with glBegin, glDrawArrays, etc. this function
@@ -1816,6 +1848,10 @@ _mesa_valid_to_render(struct gl_context *ctx, const char *where)
return GL_FALSE;
}
if (_mesa_check_blend_func_error(ctx) == GL_FALSE) {
return GL_FALSE;
}
#ifdef DEBUG
if (ctx->Shader.Flags & GLSL_LOG) {
struct gl_shader_program *shProg[MESA_SHADER_TYPES];