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GPU: Handle VRAM wrap-around behavior on scanout

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This commit is contained in:
Connor McLaughlin
2020-04-11 16:09:03 +10:00
parent fc3efebb38
commit 9e024b7a51
6 changed files with 131 additions and 74 deletions
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20
src/core/gpu_hw_shadergen.cpp
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@ -770,37 +770,39 @@ std::string GPU_HW_ShaderGen::GenerateDisplayFragmentShader(bool depth_24bit, bo
DefineMacro(ss, "INTERLACED", interlaced);
WriteCommonFunctions(ss);
DeclareUniformBuffer(ss, {"int u_field_offset", "int u_vram_start_x"});
DeclareUniformBuffer(ss, {"uint2 u_vram_offset", "uint u_field_offset"});
DeclareTexture(ss, "samp0", 0);
DeclareFragmentEntryPoint(ss, 0, 1, {}, true, false);
ss << R"(
{
int2 icoords = int2(v_pos.xy);
uint2 icoords = uint2(v_pos.xy) + u_vram_offset;
#if INTERLACED
if (((fixYCoord(icoords.y) / RESOLUTION_SCALE) & 1) != u_field_offset)
if (((icoords.y / uint(RESOLUTION_SCALE)) & 1u) != u_field_offset)
discard;
#endif
//icoords.y = uint(fixYCoord(int(icoords.y)));
#if DEPTH_24BIT
// relative to start of scanout
int relative_x = (icoords.x - u_vram_start_x) / RESOLUTION_SCALE;
icoords.x = u_vram_start_x + ((relative_x * 3) / 2) * RESOLUTION_SCALE;
uint relative_x = (icoords.x - u_vram_offset.x) / uint(RESOLUTION_SCALE);
icoords.x = u_vram_offset.x + ((relative_x * 3u) / 2u) * uint(RESOLUTION_SCALE);
// load adjacent 16-bit texels
uint s0 = RGBA8ToRGBA5551(LOAD_TEXTURE(samp0, icoords, 0));
uint s1 = RGBA8ToRGBA5551(LOAD_TEXTURE(samp0, icoords + int2(RESOLUTION_SCALE, 0), 0));
uint s0 = RGBA8ToRGBA5551(LOAD_TEXTURE(samp0, int2(icoords % uint2(VRAM_SIZE)), 0));
uint s1 = RGBA8ToRGBA5551(LOAD_TEXTURE(samp0, int2((icoords + uint2(uint(RESOLUTION_SCALE), 0)) % uint2(VRAM_SIZE)), 0));
// select which part of the combined 16-bit texels we are currently shading
uint s1s0 = ((s1 << 16) | s0) >> ((relative_x & 1) * 8);
uint s1s0 = ((s1 << 16) | s0) >> ((relative_x & 1u) * 8u);
// extract components and normalize
o_col0 = float4(float(s1s0 & 0xFFu) / 255.0, float((s1s0 >> 8u) & 0xFFu) / 255.0,
float((s1s0 >> 16u) & 0xFFu) / 255.0, 1.0);
#else
// load and return
o_col0 = LOAD_TEXTURE(samp0, icoords, 0);
o_col0 = LOAD_TEXTURE(samp0, int2(icoords % uint2(VRAM_SIZE)), 0);
#endif
}
)";