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(gl/vk)_shader_gen: Use floor instead of int cast (#6885)
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@ -1246,13 +1246,13 @@ float LookupLightingLUT(int lut_index, int index, float delta) {
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}
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float LookupLightingLUTUnsigned(int lut_index, float pos) {
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int index = clamp(int(pos * 256.0), 0, 255);
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int index = int(clamp(floor(pos * 256.0), 0.f, 255.f));
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float delta = pos * 256.0 - float(index);
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return LookupLightingLUT(lut_index, index, delta);
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}
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float LookupLightingLUTSigned(int lut_index, float pos) {
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int index = clamp(int(pos * 128.0), -128, 127);
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int index = int(clamp(floor(pos * 128.0), -128.f, 127.f));
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float delta = pos * 128.0 - float(index);
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if (index < 0) index += 256;
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return LookupLightingLUT(lut_index, index, delta);
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@ -1247,13 +1247,13 @@ float LookupLightingLUT(int lut_index, int index, float delta) {
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}
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float LookupLightingLUTUnsigned(int lut_index, float pos) {
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int index = clamp(int(pos * 256.0), 0, 255);
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int index = int(clamp(floor(pos * 256.0), 0.f, 255.f));
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float delta = pos * 256.0 - float(index);
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return LookupLightingLUT(lut_index, index, delta);
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}
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float LookupLightingLUTSigned(int lut_index, float pos) {
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int index = clamp(int(pos * 128.0), -128, 127);
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int index = int(clamp(floor(pos * 128.0), -128.f, 127.f));
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float delta = pos * 128.0 - float(index);
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if (index < 0) index += 256;
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return LookupLightingLUT(lut_index, index, delta);
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@ -291,16 +291,18 @@ void FragmentModule::WriteLighting() {
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}
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const auto lookup_lighting_lut_unsigned = [this](Id lut_index, Id pos) -> Id {
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const Id pos_int{OpConvertFToS(i32_id, OpFMul(f32_id, pos, ConstF32(256.f)))};
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const Id index{OpSClamp(i32_id, pos_int, ConstS32(0), ConstS32(255))};
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const Id pos_floor{OpFloor(f32_id, OpFMul(f32_id, pos, ConstF32(256.f)))};
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const Id index_float{OpFClamp(f32_id, pos_floor, ConstF32(0.f), ConstF32(255.f))};
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const Id index{OpConvertFToS(i32_id, index_float)};
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const Id neg_index{OpFNegate(f32_id, OpConvertSToF(f32_id, index))};
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const Id delta{OpFma(f32_id, pos, ConstF32(256.f), neg_index)};
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return LookupLightingLUT(lut_index, index, delta);
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};
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const auto lookup_lighting_lut_signed = [this](Id lut_index, Id pos) -> Id {
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const Id pos_int{OpConvertFToS(i32_id, OpFMul(f32_id, pos, ConstF32(128.f)))};
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const Id index{OpSClamp(i32_id, pos_int, ConstS32(-128), ConstS32(127))};
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const Id pos_floor{OpFloor(f32_id, OpFMul(f32_id, pos, ConstF32(128.f)))};
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const Id index_float{OpFClamp(f32_id, pos_floor, ConstF32(-128.f), ConstF32(127.f))};
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const Id index{OpConvertFToS(i32_id, index_float)};
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const Id neg_index{OpFNegate(f32_id, OpConvertSToF(f32_id, index))};
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const Id delta{OpFma(f32_id, pos, ConstF32(128.f), neg_index)};
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const Id increment{
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