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PixelShaderGen: Always truncate the alpha channel to 6-bit.

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This commit is contained in:
Jules Blok 2016-09-08 02:43:05 +02:00
parent 9bc466a443
commit 31a4ee7bfc
1 changed files with 28 additions and 13 deletions
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41
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -346,8 +346,8 @@ static void SampleTexture(ShaderCode& out, const char* texcoords, const char* te
static void WriteAlphaTest(ShaderCode& out, const pixel_shader_uid_data* uid_data, APIType ApiType,
bool per_pixel_depth);
static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data);
static void WriteColor(ShaderCode& out, const pixel_shader_uid_data* uid_data, const char* type,
const char* color);
static void WriteColor(ShaderCode& out, const pixel_shader_uid_data* uid_data, const char* color);
static void WriteAlpha(ShaderCode& out, const char* alpha);
ShaderCode GeneratePixelShaderCode(APIType ApiType, const pixel_shader_uid_data* uid_data)
{
@ -780,8 +780,11 @@ ShaderCode GeneratePixelShaderCode(APIType ApiType, const pixel_shader_uid_data*
out.Write("\tdepth = float(zCoord) / 16777216.0;\n");
}
// No dithering for RGB8 mode
if (uid_data->dither && uid_data->rgba6_format)
{
// Flipper uses a standard 2x2 Bayer Matrix for 6 bit dithering
// Here the matrix is encoded into the two factor constants
out.Write("\tint2 dither = int2(rawpos.xy) & 1;\n");
out.Write("\tprev.rgb = (prev.rgb - (prev.rgb >> 6)) + abs(dither.y * 3 - dither.x * 2);\n");
}
@ -789,14 +792,18 @@ ShaderCode GeneratePixelShaderCode(APIType ApiType, const pixel_shader_uid_data*
if (uid_data->dstAlphaMode == DSTALPHA_ALPHA_PASS)
{
out.SetConstantsUsed(C_ALPHA, C_ALPHA);
out.Write("\tocol0 = ");
WriteColor(out, uid_data, "float4", "prev.rgb, " I_ALPHA ".a");
out.Write("\tocol0.rgb = ");
WriteColor(out, uid_data, "prev.rgb");
out.Write("\tocol0.a = ");
WriteAlpha(out, I_ALPHA ".a");
}
else
{
WriteFog(out, uid_data);
out.Write("\tocol0 = ");
WriteColor(out, uid_data, "float4", "prev");
out.Write("\tocol0.rgb = ");
WriteColor(out, uid_data, "prev.rgb");
out.Write("\tocol0.a = ");
WriteAlpha(out, "prev.a");
}
// Use dual-source color blending to perform dst alpha in a single pass
@ -806,10 +813,12 @@ ShaderCode GeneratePixelShaderCode(APIType ApiType, const pixel_shader_uid_data*
// Colors will be blended against the alpha from ocol1 and
// the alpha from ocol0 will be written to the framebuffer.
out.Write("\tocol1 = ");
WriteColor(out, uid_data, "float4", "prev");
out.Write("\tocol1.rgb = ");
WriteColor(out, uid_data, "prev.rgb");
out.Write("\tocol1.a = ");
WriteAlpha(out, "prev.a");
out.Write("\tocol0.a = ");
WriteColor(out, uid_data, "float", I_ALPHA ".a");
WriteAlpha(out, I_ALPHA ".a");
}
if (uid_data->bounding_box)
@ -1310,11 +1319,17 @@ static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data)
out.Write("\tprev.rgb = (prev.rgb * (256 - ifog) + " I_FOGCOLOR ".rgb * ifog) >> 8;\n");
}
static void WriteColor(ShaderCode& out, const pixel_shader_uid_data* uid_data, const char* type,
const char* color)
static void WriteColor(ShaderCode& out, const pixel_shader_uid_data* uid_data, const char* color)
{
if (uid_data->rgba6_format)
out.Write("%s(%s >> 2) / 63.0;\n", type, color);
out.Write("float3(%s >> 2) / 63.0;\n", color);
else
out.Write("%s(%s) / 255.0;\n", type, color);
out.Write("float3(%s) / 255.0;\n", color);
}
static void WriteAlpha(ShaderCode& out, const char* color)
{
// Always truncate the alpha to 6-bit, as there is no format available
// on flipper that supports 8-bit.
out.Write("float(%s >> 2) / 63.0;\n", color);
}