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GPU: Preserve low bits in upscaled texture coordinates

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This commit is contained in:
Connor McLaughlin 2019-10-27 23:50:28 +10:00
parent 12ce777e30
commit 49be3efb35
1 changed files with 20 additions and 12 deletions
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32
src/core/gpu_hw.cpp
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@ -220,10 +220,10 @@ void main()
v_tex0 = a_tex0;
// base_x,base_y,palette_x,palette_y
v_texpage.x = (a_texpage & 15) * 64;
v_texpage.y = ((a_texpage >> 4) & 1) * 256;
v_texpage.z = ((a_texpage >> 16) & 63) * 16;
v_texpage.w = ((a_texpage >> 22) & 511);
v_texpage.x = (a_texpage & 15) * 64 * RESOLUTION_SCALE;
v_texpage.y = ((a_texpage >> 4) & 1) * 256 * RESOLUTION_SCALE;
v_texpage.z = ((a_texpage >> 16) & 63) * 16 * RESOLUTION_SCALE;
v_texpage.w = ((a_texpage >> 22) & 511) * RESOLUTION_SCALE;
#endif
}
)";
@ -260,17 +260,27 @@ uniform vec2 u_transparent_alpha;
out vec4 o_col0;
#if TEXTURED
ivec2 ApplyTextureWindow(ivec2 coords)
ivec2 ApplyNativeTextureWindow(ivec2 coords)
{
uint x = (uint(coords.x) & ~(u_texture_window.x * 8u)) | ((u_texture_window.z & u_texture_window.x) * 8u);
uint y = (uint(coords.y) & ~(u_texture_window.y * 8u)) | ((u_texture_window.w & u_texture_window.y) * 8u);
return ivec2(int(x), int(y));
}
ivec2 ApplyTextureWindow(ivec2 coords)
{
if (RESOLUTION_SCALE == 1)
return ApplyNativeTextureWindow(coords);
ivec2 downscaled_coords = coords / ivec2(RESOLUTION_SCALE);
ivec2 coords_offset = coords % ivec2(RESOLUTION_SCALE);
return (ApplyNativeTextureWindow(downscaled_coords) * ivec2(RESOLUTION_SCALE)) + coords_offset;
}
vec4 SampleFromVRAM(vec2 coord)
{
// from 0..1 to 0..255
ivec2 icoord = ivec2(coord * vec2(255.0));
ivec2 icoord = ivec2(coord * vec2(255 * RESOLUTION_SCALE));
icoord = ApplyTextureWindow(icoord);
// adjust for tightly packed palette formats
@ -282,8 +292,7 @@ vec4 SampleFromVRAM(vec2 coord)
#endif
// fixup coords
ivec2 vicoord = ivec2((v_texpage.x + index_coord.x) * RESOLUTION_SCALE,
fixYCoord((v_texpage.y + index_coord.y) * RESOLUTION_SCALE));
ivec2 vicoord = ivec2(v_texpage.x + index_coord.x, fixYCoord(v_texpage.y + index_coord.y));
// load colour/palette
vec4 color = texelFetch(samp0, vicoord, 0);
@ -291,16 +300,15 @@ vec4 SampleFromVRAM(vec2 coord)
// apply palette
#if PALETTE
#if PALETTE_4_BIT
int subpixel = int(icoord.x) & 3;
int subpixel = int(icoord.x / RESOLUTION_SCALE) & 3;
uint vram_value = RGBA8ToRGBA5551(color);
int palette_index = int((vram_value >> (subpixel * 4)) & 0x0Fu);
#elif PALETTE_8_BIT
int subpixel = int(icoord.x) & 1;
int subpixel = int(icoord.x / RESOLUTION_SCALE) & 1;
uint vram_value = RGBA8ToRGBA5551(color);
int palette_index = int((vram_value >> (subpixel * 8)) & 0xFFu);
#endif
ivec2 palette_icoord = ivec2((v_texpage.z + palette_index) * RESOLUTION_SCALE,
fixYCoord(v_texpage.w * RESOLUTION_SCALE));
ivec2 palette_icoord = ivec2(v_texpage.z + (palette_index * RESOLUTION_SCALE), fixYCoord(v_texpage.w));
color = texelFetch(samp0, palette_icoord, 0);
#endif