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PixelShaderGen: Implement table-based fog range as in software renderer

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Stenzek
2018-02-03 17:01:34 +10:00
parent e7d0aae5be
commit 340ee8fff8
5 changed files with 46 additions and 31 deletions
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24
Source/Core/VideoCommon/PixelShaderGen.cpp
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@ -397,7 +397,8 @@ void WritePixelShaderCommonHeader(ShaderCode& out, APIType ApiType, u32 num_texg
"\tint4 " I_INDTEXMTX "[6];\n"
"\tint4 " I_FOGCOLOR ";\n"
"\tint4 " I_FOGI ";\n"
"\tfloat4 " I_FOGF "[2];\n"
"\tfloat4 " I_FOGF ";\n"
"\tfloat4 " I_FOGRANGE "[3];\n"
"\tfloat4 " I_ZSLOPE ";\n"
"\tfloat2 " I_EFBSCALE ";\n"
"\tuint bpmem_genmode;\n"
@ -1331,30 +1332,33 @@ static void WriteFog(ShaderCode& out, const pixel_shader_uid_data* uid_data)
// renderer)
// Maybe we want to use "ze = (A << B_SHF)/((B << B_SHF) - Zs)" instead?
// That's equivalent, but keeps the lower bits of Zs.
out.Write("\tfloat ze = (" I_FOGF "[1].x * 16777216.0) / float(" I_FOGI
".y - (zCoord >> " I_FOGI ".w));\n");
out.Write("\tfloat ze = (" I_FOGF ".x * 16777216.0) / float(" I_FOGI ".y - (zCoord >> " I_FOGI
".w));\n");
}
else
{
// orthographic
// ze = a*Zs (here, no B_SHF)
out.Write("\tfloat ze = " I_FOGF "[1].x * float(zCoord) / 16777216.0;\n");
out.Write("\tfloat ze = " I_FOGF ".x * float(zCoord) / 16777216.0;\n");
}
// x_adjust = sqrt((x-center)^2 + k^2)/k
// ze *= x_adjust
// TODO Instead of this theoretical calculation, we should use the
// coefficient table given in the fog range BP registers!
if (uid_data->fog_RangeBaseEnabled)
{
out.SetConstantsUsed(C_FOGF, C_FOGF);
out.Write("\tfloat x_adjust = (2.0 * (rawpos.x / " I_FOGF "[0].y)) - 1.0 - " I_FOGF "[0].x;\n");
out.Write("\tx_adjust = sqrt(x_adjust * x_adjust + " I_FOGF "[0].z * " I_FOGF "[0].z) / " I_FOGF
"[0].z;\n");
out.Write("\tfloat offset = (2.0 * (rawpos.x / " I_FOGF ".w)) - 1.0 - " I_FOGF ".z;\n");
out.Write("\tfloat floatindex = clamp(9.0 - abs(offset) * 9.0, 0.0, 9.0);\n");
out.Write("\tuint indexlower = uint(floor(floatindex));\n");
out.Write("\tuint indexupper = indexlower + 1u;\n");
out.Write("\tfloat klower = " I_FOGRANGE "[indexlower >> 2u][indexlower & 3u];\n");
out.Write("\tfloat kupper = " I_FOGRANGE "[indexupper >> 2u][indexupper & 3u];\n");
out.Write("\tfloat k = lerp(klower, kupper, frac(floatindex));\n");
out.Write("\tfloat x_adjust = sqrt(offset * offset + k * k) / k;\n");
out.Write("\tze *= x_adjust;\n");
}
out.Write("\tfloat fog = clamp(ze - " I_FOGF "[1].z, 0.0, 1.0);\n");
out.Write("\tfloat fog = clamp(ze - " I_FOGF ".y, 0.0, 1.0);\n");
if (uid_data->fog_fsel > 3)
{