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mesa: create some glBlendFunc*() helper functions

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Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
This commit is contained in:
Timothy Arceri
2017-06-28 15:21:51 +10:00
parent 87bc32166a
commit f21a764092
1 changed files with 92 additions and 61 deletions
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153
src/mesa/main/blend.c
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@@ -157,20 +157,6 @@ validate_blend_factors(struct gl_context *ctx, const char *func,
}
/**
* Specify the blending operation.
*
* \param sfactor source factor operator.
* \param dfactor destination factor operator.
*
* \sa glBlendFunc, glBlendFuncSeparateEXT
*/
void GLAPIENTRY
_mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
{
_mesa_BlendFuncSeparate(sfactor, dfactor, sfactor, dfactor);
}
static GLboolean
blend_factor_is_dual_src(GLenum factor)
{
@@ -203,6 +189,95 @@ num_buffers(const struct gl_context *ctx)
}
/* Returns true if there was no change */
static bool
skip_blend_state_update(const struct gl_context *ctx,
GLenum sfactorRGB, GLenum dfactorRGB,
GLenum sfactorA, GLenum dfactorA)
{
/* Check if we're really changing any state. If not, return early. */
if (ctx->Color._BlendFuncPerBuffer) {
const unsigned numBuffers = num_buffers(ctx);
/* Check all per-buffer states */
for (unsigned 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) {
return false;
}
}
}
else {
/* only need to check 0th per-buffer state */
if (ctx->Color.Blend[0].SrcRGB != sfactorRGB ||
ctx->Color.Blend[0].DstRGB != dfactorRGB ||
ctx->Color.Blend[0].SrcA != sfactorA ||
ctx->Color.Blend[0].DstA != dfactorA) {
return false;
}
}
return true;
}
static void
blend_func_separate(struct gl_context *ctx,
GLenum sfactorRGB, GLenum dfactorRGB,
GLenum sfactorA, GLenum dfactorA)
{
FLUSH_VERTICES(ctx, ctx->DriverFlags.NewBlend ? 0 : _NEW_COLOR);
ctx->NewDriverState |= ctx->DriverFlags.NewBlend;
const unsigned numBuffers = num_buffers(ctx);
for (unsigned 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;
}
update_uses_dual_src(ctx, 0);
for (unsigned buf = 1; buf < numBuffers; buf++) {
ctx->Color.Blend[buf]._UsesDualSrc = ctx->Color.Blend[0]._UsesDualSrc;
}
ctx->Color._BlendFuncPerBuffer = GL_FALSE;
if (ctx->Driver.BlendFuncSeparate) {
ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
sfactorA, dfactorA);
}
}
/**
* Specify the blending operation.
*
* \param sfactor source factor operator.
* \param dfactor destination factor operator.
*
* \sa glBlendFunc, glBlendFuncSeparateEXT
*/
void GLAPIENTRY
_mesa_BlendFunc( GLenum sfactor, GLenum dfactor )
{
GET_CURRENT_CONTEXT(ctx);
if (skip_blend_state_update(ctx, sfactor, dfactor, sfactor, dfactor))
return;
if (!validate_blend_factors(ctx, "glBlendFunc",
sfactor, dfactor, sfactor, dfactor)) {
return;
}
blend_func_separate(ctx, sfactor, dfactor, sfactor, dfactor);
}
/**
* Set the separate blend source/dest factors for all draw buffers.
*
@@ -216,9 +291,6 @@ _mesa_BlendFuncSeparate( GLenum sfactorRGB, GLenum dfactorRGB,
GLenum sfactorA, GLenum dfactorA )
{
GET_CURRENT_CONTEXT(ctx);
const unsigned numBuffers = num_buffers(ctx);
unsigned buf;
bool changed = false;
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glBlendFuncSeparate %s %s %s %s\n",
@@ -227,30 +299,9 @@ _mesa_BlendFuncSeparate( GLenum sfactorRGB, GLenum dfactorRGB,
_mesa_enum_to_string(sfactorA),
_mesa_enum_to_string(dfactorA));
/* Check if we're really changing any state. If not, return early. */
if (ctx->Color._BlendFuncPerBuffer) {
/* Check all per-buffer states */
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 = true;
break;
}
}
}
else {
/* only need to check 0th per-buffer state */
if (ctx->Color.Blend[0].SrcRGB != sfactorRGB ||
ctx->Color.Blend[0].DstRGB != dfactorRGB ||
ctx->Color.Blend[0].SrcA != sfactorA ||
ctx->Color.Blend[0].DstA != dfactorA) {
changed = true;
}
}
if (!changed)
if (skip_blend_state_update(ctx, sfactorRGB, dfactorRGB, sfactorA, dfactorA))
return;
if (!validate_blend_factors(ctx, "glBlendFuncSeparate",
@@ -259,27 +310,7 @@ _mesa_BlendFuncSeparate( GLenum sfactorRGB, GLenum dfactorRGB,
return;
}
FLUSH_VERTICES(ctx, ctx->DriverFlags.NewBlend ? 0 : _NEW_COLOR);
ctx->NewDriverState |= ctx->DriverFlags.NewBlend;
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;
}
update_uses_dual_src(ctx, 0);
for (buf = 1; buf < numBuffers; buf++) {
ctx->Color.Blend[buf]._UsesDualSrc = ctx->Color.Blend[0]._UsesDualSrc;
}
ctx->Color._BlendFuncPerBuffer = GL_FALSE;
if (ctx->Driver.BlendFuncSeparate) {
ctx->Driver.BlendFuncSeparate(ctx, sfactorRGB, dfactorRGB,
sfactorA, dfactorA);
}
blend_func_separate(ctx, sfactorRGB, dfactorRGB, sfactorA, dfactorA);
}