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GPU/SW: Wrap texture coordinates when sampling

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This commit is contained in:
Connor McLaughlin 2020-08-04 13:18:59 +10:00
parent 69cbc0b5a2
commit 231c0b5ff6
1 changed files with 10 additions and 15 deletions
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25
src/core/gpu_sw.cpp
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@ -614,33 +614,28 @@ void GPU_SW::ShadePixel(u32 x, u32 y, u8 color_r, u8 color_g, u8 color_b, u8 tex
{
case GPU::TextureMode::Palette4Bit:
{
const u16 palette_value =
GetPixel(std::min<u32>(m_draw_mode.texture_page_x + ZeroExtend32(texcoord_x / 4), VRAM_WIDTH - 1),
std::min<u32>(m_draw_mode.texture_page_y + ZeroExtend32(texcoord_y), VRAM_HEIGHT - 1));
const u16 palette_value = GetPixel((m_draw_mode.texture_page_x + ZeroExtend32(texcoord_x / 4)) % VRAM_WIDTH,
(m_draw_mode.texture_page_y + ZeroExtend32(texcoord_y)) % VRAM_HEIGHT);
const u16 palette_index = (palette_value >> ((texcoord_x % 4) * 4)) & 0x0Fu;
texture_color.bits =
GetPixel(std::min<u32>(m_draw_mode.texture_palette_x + ZeroExtend32(palette_index), VRAM_WIDTH - 1),
m_draw_mode.texture_palette_y);
texture_color.bits = GetPixel((m_draw_mode.texture_palette_x + ZeroExtend32(palette_index)) % VRAM_WIDTH,
m_draw_mode.texture_palette_y);
}
break;
case GPU::TextureMode::Palette8Bit:
{
const u16 palette_value =
GetPixel(std::min<u32>(m_draw_mode.texture_page_x + ZeroExtend32(texcoord_x / 2), VRAM_WIDTH - 1),
std::min<u32>(m_draw_mode.texture_page_y + ZeroExtend32(texcoord_y), VRAM_HEIGHT - 1));
const u16 palette_value = GetPixel((m_draw_mode.texture_page_x + ZeroExtend32(texcoord_x / 2)) % VRAM_WIDTH,
(m_draw_mode.texture_page_y + ZeroExtend32(texcoord_y)) % VRAM_HEIGHT);
const u16 palette_index = (palette_value >> ((texcoord_x % 2) * 8)) & 0xFFu;
texture_color.bits =
GetPixel(std::min<u32>(m_draw_mode.texture_palette_x + ZeroExtend32(palette_index), VRAM_WIDTH - 1),
m_draw_mode.texture_palette_y);
texture_color.bits = GetPixel((m_draw_mode.texture_palette_x + ZeroExtend32(palette_index)) % VRAM_WIDTH,
m_draw_mode.texture_palette_y);
}
break;
default:
{
texture_color.bits =
GetPixel(std::min<u32>(m_draw_mode.texture_page_x + ZeroExtend32(texcoord_x), VRAM_WIDTH - 1),
std::min<u32>(m_draw_mode.texture_page_y + ZeroExtend32(texcoord_y), VRAM_HEIGHT - 1));
texture_color.bits = GetPixel((m_draw_mode.texture_page_x + ZeroExtend32(texcoord_x)) % VRAM_WIDTH,
(m_draw_mode.texture_page_y + ZeroExtend32(texcoord_y)) % VRAM_HEIGHT);
}
break;
}