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DX11 plugin: Do destination-alpha in a single pass. No more drawing the same geometry twice! SMG is faster now because it uses destination-alpha extensively. This uses dual-source color blending, a DirectX 10-level feature. The equivalent OpenGL function comes from the GL_ARB_blend_func_extended extension, which was made core in OpenGL 3.3.

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git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6294 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
Nolan Check
2010-10-20 03:11:22 +00:00
parent 479eea6ad2
commit cb453a0fb3
7 changed files with 79 additions and 62 deletions
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22
Source/Core/VideoCommon/Src/PixelShaderGen.cpp
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@ -521,7 +521,7 @@ const char *GeneratePixelShaderCode(bool dstAlphaEnable, API_TYPE ApiType,u32 co
if(ApiType != API_D3D11)
WRITE(p, " out float4 ocol0 : COLOR0,%s\n in float4 rawpos : %s,\n",DepthTextureEnable ? "\n out float depth : DEPTH," : "", ApiType == API_OPENGL ? "WPOS" : "POSITION");
else
WRITE(p, " out float4 ocol0 : SV_Target,%s\n in float4 rawpos : SV_Position,\n",DepthTextureEnable ? "\n out float depth : SV_Depth," : "");
WRITE(p, " out float4 ocol0 : SV_Target0,\n out float4 ocol1 : SV_Target1,%s\n in float4 rawpos : SV_Position,\n",DepthTextureEnable ? "\n out float depth : SV_Depth," : "");
WRITE(p, " in float4 colors_0 : COLOR0,\n");
WRITE(p, " in float4 colors_1 : COLOR1");
@ -544,7 +544,8 @@ const char *GeneratePixelShaderCode(bool dstAlphaEnable, API_TYPE ApiType,u32 co
char* pmainstart = p;
int Pretest = AlphaPreTest();
if (dstAlphaEnable && !DepthTextureEnable && Pretest >= 0)
// TODO: Re-enable the early discard on D3D11
if (dstAlphaEnable && !DepthTextureEnable && Pretest >= 0 && ApiType != API_D3D11)
{
if (!Pretest)
{
@ -806,13 +807,24 @@ const char *GeneratePixelShaderCode(bool dstAlphaEnable, API_TYPE ApiType,u32 co
WRITE(p, "depth = zCoord;\n");
}
if (dstAlphaEnable)
if (dstAlphaEnable && ApiType != API_D3D11)
WRITE(p, " ocol0 = float4(prev.rgb, "I_ALPHA"[0].a);\n");
else
{
WriteFog(p);
WRITE(p, " ocol0 = prev;\n");
}
}
// On D3D11, use dual-source color blending to perform dst alpha in a
// single pass
if (ApiType == API_D3D11)
{
// Colors will be blended against the alpha from ocol1...
WRITE(p, " ocol1 = ocol0;\n");
// ...and the alpha from ocol0 will be written to the framebuffer.
if (dstAlphaEnable)
WRITE(p, " ocol0.a = "I_ALPHA"[0].a;\n");
}
}
WRITE(p, "}\n");
if (text[sizeof(text) - 1] != 0x7C)
@ -1256,7 +1268,7 @@ static bool WriteAlphaTest(char *&p, API_TYPE ApiType)
int Pretest = AlphaPreTest();
if(Pretest >= 0)
{
return Pretest;
return Pretest != 0;
}
// using discard then return works the same in cg and dx9 but not in dx11