GB Video: Fix SGB border transparency Make the first color of every palette transparent. This fixes Pokemon Blue's SGB border (as long as the platform has initialized its output buffer to white).
Douglas Christman DouglasChristman@gmail.com
Sun, 25 Mar 2018 16:13:25 +0800
2 files changed,
20 insertions(+),
18 deletions(-)
M
src/gb/renderers/software.c
→
src/gb/renderers/software.c
@@ -75,25 +75,25 @@ tileData[2] = renderer->d.sgbCharRam[(SGBBgAttributesGetTile(mapData) * 16 + localY) * 2 + 0x10];
tileData[3] = renderer->d.sgbCharRam[(SGBBgAttributesGetTile(mapData) * 16 + localY) * 2 + 0x11]; size_t base = y * renderer->outputBufferStride + x; - int p = SGBBgAttributesGetPalette(mapData) * 0x10; + int paletteBase = SGBBgAttributesGetPalette(mapData) * 0x10; + int colorSelector; + if (SGBBgAttributesIsXFlip(mapData)) { - renderer->outputBuffer[base + 0] = renderer->palette[p | ((tileData[0] >> 0) & 0x1) | ((tileData[1] << 1) & 0x2) | ((tileData[2] << 2) & 0x4) | ((tileData[3] << 3) & 0x8)]; - renderer->outputBuffer[base + 1] = renderer->palette[p | ((tileData[0] >> 1) & 0x1) | ((tileData[1] >> 0) & 0x2) | ((tileData[2] << 1) & 0x4) | ((tileData[3] << 2) & 0x8)]; - renderer->outputBuffer[base + 2] = renderer->palette[p | ((tileData[0] >> 2) & 0x1) | ((tileData[1] >> 1) & 0x2) | ((tileData[2] >> 0) & 0x4) | ((tileData[3] << 1) & 0x8)]; - renderer->outputBuffer[base + 3] = renderer->palette[p | ((tileData[0] >> 3) & 0x1) | ((tileData[1] >> 2) & 0x2) | ((tileData[2] >> 1) & 0x4) | ((tileData[3] >> 0) & 0x8)]; - renderer->outputBuffer[base + 4] = renderer->palette[p | ((tileData[0] >> 4) & 0x1) | ((tileData[1] >> 3) & 0x2) | ((tileData[2] >> 2) & 0x4) | ((tileData[3] >> 1) & 0x8)]; - renderer->outputBuffer[base + 5] = renderer->palette[p | ((tileData[0] >> 5) & 0x1) | ((tileData[1] >> 4) & 0x2) | ((tileData[2] >> 3) & 0x4) | ((tileData[3] >> 2) & 0x8)]; - renderer->outputBuffer[base + 6] = renderer->palette[p | ((tileData[0] >> 6) & 0x1) | ((tileData[1] >> 5) & 0x2) | ((tileData[2] >> 4) & 0x4) | ((tileData[3] >> 3) & 0x8)]; - renderer->outputBuffer[base + 7] = renderer->palette[p | ((tileData[0] >> 7) & 0x1) | ((tileData[1] >> 6) & 0x2) | ((tileData[2] >> 5) & 0x4) | ((tileData[3] >> 4) & 0x8)]; + for (i = 0; i < 8; ++i) { + colorSelector = (tileData[0] >> i & 0x1) << 0 | (tileData[1] >> i & 0x1) << 1 | (tileData[2] >> i & 0x1) << 2 | (tileData[3] >> i & 0x1) << 3; + // The first color of every palette is transparent + if (colorSelector) { + renderer->outputBuffer[base + i] = renderer->palette[paletteBase | colorSelector]; + } + } } else { - renderer->outputBuffer[base + 0] = renderer->palette[p | ((tileData[0] >> 7) & 0x1) | ((tileData[1] >> 6) & 0x2) | ((tileData[2] >> 5) & 0x4) | ((tileData[3] >> 4) & 0x8)]; - renderer->outputBuffer[base + 1] = renderer->palette[p | ((tileData[0] >> 6) & 0x1) | ((tileData[1] >> 5) & 0x2) | ((tileData[2] >> 4) & 0x4) | ((tileData[3] >> 3) & 0x8)]; - renderer->outputBuffer[base + 2] = renderer->palette[p | ((tileData[0] >> 5) & 0x1) | ((tileData[1] >> 4) & 0x2) | ((tileData[2] >> 3) & 0x4) | ((tileData[3] >> 2) & 0x8)]; - renderer->outputBuffer[base + 3] = renderer->palette[p | ((tileData[0] >> 4) & 0x1) | ((tileData[1] >> 3) & 0x2) | ((tileData[2] >> 2) & 0x4) | ((tileData[3] >> 1) & 0x8)]; - renderer->outputBuffer[base + 4] = renderer->palette[p | ((tileData[0] >> 3) & 0x1) | ((tileData[1] >> 2) & 0x2) | ((tileData[2] >> 1) & 0x4) | ((tileData[3] >> 0) & 0x8)]; - renderer->outputBuffer[base + 5] = renderer->palette[p | ((tileData[0] >> 2) & 0x1) | ((tileData[1] >> 1) & 0x2) | ((tileData[2] >> 0) & 0x4) | ((tileData[3] << 1) & 0x8)]; - renderer->outputBuffer[base + 6] = renderer->palette[p | ((tileData[0] >> 1) & 0x1) | ((tileData[1] >> 0) & 0x2) | ((tileData[2] << 1) & 0x4) | ((tileData[3] << 2) & 0x8)]; - renderer->outputBuffer[base + 7] = renderer->palette[p | ((tileData[0] >> 0) & 0x1) | ((tileData[1] << 1) & 0x2) | ((tileData[2] << 2) & 0x4) | ((tileData[3] << 3) & 0x8)]; + for (i = 7; i >= 0; --i) { + colorSelector = (tileData[0] >> i & 0x1) << 0 | (tileData[1] >> i & 0x1) << 1 | (tileData[2] >> i & 0x1) << 2 | (tileData[3] >> i & 0x1) << 3; + + if (colorSelector) { + renderer->outputBuffer[base + 7 - i] = renderer->palette[paletteBase | colorSelector]; + } + } } } }
M
src/platform/libretro/libretro.c
→
src/platform/libretro/libretro.c
@@ -438,7 +438,9 @@ mCoreInitConfig(core, NULL);
core->init(core); core->setAVStream(core, &stream); - outputBuffer = malloc(256 * 224 * BYTES_PER_PIXEL); + size_t size = 256 * 224 * BYTES_PER_PIXEL; + outputBuffer = malloc(size); + memset(outputBuffer, 0xFF, size); core->setVideoBuffer(core, outputBuffer, 256); core->setAudioBufferSize(core, SAMPLES);