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fix incorrect rounding on negative texture coordinates (#2679)
authored by
Matt Zykan
and committed by
GitHub
70ee0b6c
794ee52b
+6
-5
+6
-5
src/core/draw.c
+6
-5
src/core/draw.c
···
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enum { MapWidth = TIC_MAP_WIDTH * TIC_SPRITESIZE, MapHeight = TIC_MAP_HEIGHT * TIC_SPRITESIZE,
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WMask = TIC_SPRITESIZE - 1, HMask = TIC_SPRITESIZE - 1 };
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-
s32 iu = tic_modulo(vars.x, MapWidth);
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-
s32 iv = tic_modulo(vars.y, MapHeight);
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s32 iu = tic_modulo(floor(vars.x), MapWidth);
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+
s32 iv = tic_modulo(floor(vars.y), MapHeight);
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u8 idx = data->map[(iv >> 3) * TIC_MAP_WIDTH + (iu >> 3)];
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tic_tileptr tile = tic_tilesheet_gettile(&data->sheet, idx, true);
···
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enum { WMask = TIC_SPRITESHEET_SIZE - 1, HMask = TIC_SPRITESHEET_SIZE * TIC_SPRITE_BANKS - 1 };
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-
return shaderEnd(a, &vars, pixel, data->mapping[tic_tilesheet_getpix(&data->sheet, (s32)vars.x & WMask, (s32)vars.y & HMask)]);
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return shaderEnd(a, &vars, pixel, data->mapping[tic_tilesheet_getpix(&data->sheet,
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(s32)floor(vars.x) & WMask, (s32)floor(vars.y) & HMask)]);
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}
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static tic_color triTexVbankShader(const ShaderAttr* a, s32 pixel)
···
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if(!shaderStart(a, &vars, pixel))
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return TRANSPARENT_COLOR;
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-
s32 iu = tic_modulo(vars.x, TIC80_WIDTH);
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-
s32 iv = tic_modulo(vars.y, TIC80_HEIGHT);
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s32 iu = tic_modulo(floor(vars.x), TIC80_WIDTH);
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s32 iv = tic_modulo(floor(vars.y), TIC80_HEIGHT);
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return shaderEnd(a, &vars, pixel, data->mapping[tic_tool_peek4(data->vram->data, iv * TIC80_WIDTH + iu)]);
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}