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SwRasterizer: Move the fog calculation to its own function.

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This commit is contained in:
Subv 2017-06-10 12:34:10 -05:00
parent bbda62960d
commit 0b0fa375d6
1 changed files with 41 additions and 33 deletions
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74
src/video_core/swrasterizer/rasterizer.cpp
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@ -214,6 +214,46 @@ bool PerformAlphaTest(const Math::Vec4<u8>& combiner_output) {
UNREACHABLE();
};
Math::Vec4<u8> ApplyFogCombiner(const Math::Vec4<u8>& combiner_output, float depth) {
// Apply fog combiner
// Not fully accurate. We'd have to know what data type is used to
// store the depth etc. Using float for now until we know more
// about Pica datatypes
if (g_state.regs.texturing.fog_mode == TexturingRegs::FogMode::Fog) {
const Math::Vec3<u8> fog_color = {
static_cast<u8>(g_state.regs.texturing.fog_color.r.Value()),
static_cast<u8>(g_state.regs.texturing.fog_color.g.Value()),
static_cast<u8>(g_state.regs.texturing.fog_color.b.Value()),
};
// Get index into fog LUT
float fog_index;
if (g_state.regs.texturing.fog_flip) {
fog_index = (1.0f - depth) * 128.0f;
} else {
fog_index = depth * 128.0f;
}
// Generate clamped fog factor from LUT for given fog index
float fog_i = MathUtil::Clamp(floorf(fog_index), 0.0f, 127.0f);
float fog_f = fog_index - fog_i;
const auto& fog_lut_entry = g_state.fog.lut[static_cast<unsigned int>(fog_i)];
float fog_factor = (fog_lut_entry.value + fog_lut_entry.difference * fog_f) /
2047.0f; // This is signed fixed point 1.11
fog_factor = MathUtil::Clamp(fog_factor, 0.0f, 1.0f);
// Blend the fog
Math::Vec4<u8> color_output;
for (unsigned i = 0; i < 3; i++) {
color_output[i] = static_cast<u8>(fog_factor * combiner_output[i] +
(1.0f - fog_factor) * fog_color[i]);
}
return color_output;
}
return combiner_output;
}
MICROPROFILE_DEFINE(GPU_Rasterization, "GPU", "Rasterization", MP_RGB(50, 50, 240));
/**
@ -565,39 +605,7 @@ static void ProcessTriangleInternal(const Vertex& v0, const Vertex& v1, const Ve
if (!PerformAlphaTest(combiner_output))
continue;
// Apply fog combiner
// Not fully accurate. We'd have to know what data type is used to
// store the depth etc. Using float for now until we know more
// about Pica datatypes
if (regs.texturing.fog_mode == TexturingRegs::FogMode::Fog) {
const Math::Vec3<u8> fog_color = {
static_cast<u8>(regs.texturing.fog_color.r.Value()),
static_cast<u8>(regs.texturing.fog_color.g.Value()),
static_cast<u8>(regs.texturing.fog_color.b.Value()),
};
// Get index into fog LUT
float fog_index;
if (g_state.regs.texturing.fog_flip) {
fog_index = (1.0f - depth) * 128.0f;
} else {
fog_index = depth * 128.0f;
}
// Generate clamped fog factor from LUT for given fog index
float fog_i = MathUtil::Clamp(floorf(fog_index), 0.0f, 127.0f);
float fog_f = fog_index - fog_i;
const auto& fog_lut_entry = g_state.fog.lut[static_cast<unsigned int>(fog_i)];
float fog_factor = (fog_lut_entry.value + fog_lut_entry.difference * fog_f) /
2047.0f; // This is signed fixed point 1.11
fog_factor = MathUtil::Clamp(fog_factor, 0.0f, 1.0f);
// Blend the fog
for (unsigned i = 0; i < 3; i++) {
combiner_output[i] = static_cast<u8>(fog_factor * combiner_output[i] +
(1.0f - fog_factor) * fog_color[i]);
}
}
combiner_output = ApplyFogCombiner(combiner_output, depth);
u8 old_stencil = 0;