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rsx: Implement basic 2D bilinear filtering for MSAA images

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kd-11 2022-03-30 02:19:17 +03:00 committed by kd-11
parent 3002e592c3
commit a8441b28e8
1 changed files with 32 additions and 7 deletions
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39
rpcs3/Emu/RSX/Program/GLSLCommon.cpp
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@ -795,7 +795,7 @@ namespace glsl
" {\n"
" // Renormalize to 8-bit (PS3) accuracy\n"
" rgba = floor(rgba * 255.);\n"
" rgba /= 255.;"
" rgba /= 255.;\n"
" }\n"
"\n"
" uvec4 mask;\n"
@ -904,17 +904,42 @@ namespace glsl
auto insert_msaa_sample_code = [&OS](const std::string_view& sampler_type)
{
OS <<
"vec4 sampleTexture2DMS(in " << sampler_type << " tex, const in vec2 coords, const in int index)\n"
"vec4 texelFetch2DMS(in " << sampler_type << " tex, const in ivec2 sample_count, const in ivec2 icoords, const in int index, const in ivec2 offset)\n"
"{\n"
" const uint flags = TEX_FLAGS(index);\n"
" const ivec2 sample_count = ivec2(2, textureSamples(tex) / 2);\n"
" const ivec2 icoords = ivec2(COORD_SCALE2(index, coords) * textureSize(tex) * sample_count);\n"
"\n"
" const ivec2 resolve_coords = icoords * ivec2(bvec2(texture_parameters[index].scale_bias.xy));\n"
" const ivec2 resolve_coords = (icoords + offset) * ivec2(bvec2(texture_parameters[index].scale_bias.xy));\n"
" const ivec2 aa_coords = resolve_coords / sample_count;\n"
" const ivec2 sample_loc = ivec2(resolve_coords % sample_count);\n"
" const int sample_index = sample_loc.x + (sample_loc.y * sample_count.y);\n"
" return texelFetch(tex, aa_coords, sample_index);\n"
"}\n\n"
"vec4 sampleTexture2DMS(in " << sampler_type << " tex, const in vec2 coords, const in int index)\n"
"{\n"
" const uint flags = TEX_FLAGS(index);\n"
" const vec2 normalized_coords = COORD_SCALE2(index, coords);\n"
" const ivec2 sample_count = ivec2(2, textureSamples(tex) / 2);\n"
" const ivec2 image_size = textureSize(tex) * sample_count;"
" const ivec2 icoords = ivec2(normalized_coords * image_size);\n"
" const vec4 sample0 = texelFetch2DMS(tex, sample_count, icoords, index, ivec2(0));\n"
"\n"
" if (!_test_bit(flags, FILTERED_BIT))\n"
" {\n"
" return sample0;\n"
" }\n"
"\n"
" const vec2 uv_step = 1.0 / vec2(image_size);\n"
" const vec2 up_factor = normalized_coords - (vec2(icoords) * uv_step);\n"
" // Hacky downscaling for performance reasons. Simple weighted area, upto 2x2 down.\n"
" const vec2 actual_step = vec2(dFdx(normalized_coords.x), dFdy(normalized_coords.y));\n"
" const vec2 down_factor = min(actual_step / uv_step, 1.5) - 1.0;\n"
" const vec2 factor = _select(up_factor, down_factor, greaterThan(actual_step, uv_step));\n"
" // Do linear filter\n"
" const vec4 sample1 = texelFetch2DMS(tex, sample_count, icoords, index, ivec2(1, 0));\n"
" const vec4 sample2 = texelFetch2DMS(tex, sample_count, icoords, index, ivec2(0, 1));\n"
" const vec4 sample3 = texelFetch2DMS(tex, sample_count, icoords, index, ivec2(1, 1));\n"
" const vec4 a = mix(sample0, sample1, factor.x);\n"
" const vec4 b = mix(sample2, sample3, factor.x);\n"
" return mix(a, b, factor.y);\n"
"}\n\n";
};