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Use framebuffer fetch for more accurate blending.

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On devices which support it, framebuffer fetch should give us more correct
blending than copying fbos or using a fallback (such as doubling which may
clamp.)

Not actually tested on any supported device.
This commit is contained in:
Unknown W. Brackets 2015-03-07 12:09:27 -08:00
parent 9c3ccc97a2
commit 2344760018
1 changed files with 6 additions and 0 deletions
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6
GPU/GLES/FragmentShaderGenerator.cpp
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@ -281,6 +281,8 @@ ReplaceBlendType ReplaceBlendWithShader() {
case GE_DSTBLEND_DOUBLEINVSRCALPHA:
// We can't technically do this correctly (due to clamping) without reading the dst color.
// Using a copy isn't accurate either, though, when there's overlap.
if (gl_extensions.EXT_shader_framebuffer_fetch || gl_extensions.NV_shader_framebuffer_fetch)
return !gstate_c.allowShaderBlend ? REPLACE_BLEND_PRE_SRC_2X_ALPHA : REPLACE_BLEND_COPY_FBO;
return REPLACE_BLEND_PRE_SRC_2X_ALPHA;
default:
@ -338,11 +340,15 @@ ReplaceBlendType ReplaceBlendWithShader() {
case GE_DSTBLEND_DOUBLEINVSRCALPHA:
if (funcA == GE_SRCBLEND_SRCALPHA || funcA == GE_SRCBLEND_INVSRCALPHA) {
// Can't safely double alpha, will clamp. However, a copy may easily be worse due to overlap.
if (gl_extensions.EXT_shader_framebuffer_fetch || gl_extensions.NV_shader_framebuffer_fetch)
return !gstate_c.allowShaderBlend ? REPLACE_BLEND_PRE_SRC_2X_ALPHA : REPLACE_BLEND_COPY_FBO;
return REPLACE_BLEND_PRE_SRC_2X_ALPHA;
} else {
// This means dst alpha/color is used in the src factor.
// Unfortunately, copying here causes overlap problems in Silent Hill games (it seems?)
// We will just hope that doubling alpha for the dst factor will not clamp too badly.
if (gl_extensions.EXT_shader_framebuffer_fetch || gl_extensions.NV_shader_framebuffer_fetch)
return !gstate_c.allowShaderBlend ? REPLACE_BLEND_2X_ALPHA : REPLACE_BLEND_COPY_FBO;
return REPLACE_BLEND_2X_ALPHA;
}