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mesa: optimize no-change check in _mesa_BlendEquation()

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Same story as preceeding change to _mesa_BlendFuncSeparate().

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Brian Paul
2015-10-14 09:41:11 -06:00
parent 6fd29e6c31
commit 2dfedf105d
1 changed files with 26 additions and 15 deletions
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src/mesa/main/blend.c
+26 -15
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@@ -345,33 +345,44 @@ void GLAPIENTRY
_mesa_BlendEquation( GLenum mode )
{
GLuint buf, numBuffers;
GLboolean changed;
bool changed = false;
GET_CURRENT_CONTEXT(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glBlendEquation(%s)\n",
_mesa_enum_to_string(mode));
numBuffers = ctx->Extensions.ARB_draw_buffers_blend
? ctx->Const.MaxDrawBuffers : 1;
if (ctx->Color._BlendEquationPerBuffer) {
/* Check all per-buffer states */
for (buf = 0; buf < numBuffers; buf++) {
if (ctx->Color.Blend[buf].EquationRGB != mode ||
ctx->Color.Blend[buf].EquationA != mode) {
changed = true;
break;
}
}
}
else {
/* only need to check 0th per-buffer state */
if (ctx->Color.Blend[0].EquationRGB != mode ||
ctx->Color.Blend[0].EquationA != mode) {
changed = true;
}
}
if (!changed)
return;
if (!legal_blend_equation(ctx, mode)) {
_mesa_error(ctx, GL_INVALID_ENUM, "glBlendEquation");
return;
}
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);
for (buf = 0; buf < numBuffers; buf++) {
ctx->Color.Blend[buf].EquationRGB = mode;
ctx->Color.Blend[buf].EquationA = mode;