GB Video: Fix SGB palettes on load state

src/gb/renderers/software.c

@@ -359,6 +359,9 @@ static void GBVideoSoftwareRendererWriteSGBPacket(struct GBVideoRenderer* render
 static void GBVideoSoftwareRendererWritePalette(struct GBVideoRenderer* renderer, int index, uint16_t value) {
 	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 	color_t color = mColorFrom555(value);
+	if (softwareRenderer->model == GB_MODEL_SGB && index < 0x10 && index && !(index & 3)) {
+		color = softwareRenderer->palette[0];
+	}
 	softwareRenderer->palette[index] = color;
 	if (renderer->cache) {
 		mCacheSetWritePalette(renderer->cache, index, color);

src/gb/video.c

@@ -606,12 +606,12 @@ void GBVideoWriteSGBPacket(struct GBVideo* video, uint8_t* data) {
 		video->renderer->writePalette(video->renderer, 1, video->palette[1]);
 		video->renderer->writePalette(video->renderer, 2, video->palette[2]);
 		video->renderer->writePalette(video->renderer, 3, video->palette[3]);
-		video->renderer->writePalette(video->renderer, 4, video->palette[0]);
+		video->renderer->writePalette(video->renderer, 4, video->palette[4]);
 		video->renderer->writePalette(video->renderer, 5, video->palette[5]);
 		video->renderer->writePalette(video->renderer, 6, video->palette[6]);
 		video->renderer->writePalette(video->renderer, 7, video->palette[7]);
-		video->renderer->writePalette(video->renderer, 8, video->palette[0]);
-		video->renderer->writePalette(video->renderer, 12, video->palette[0]);
+		video->renderer->writePalette(video->renderer, 8, video->palette[8]);
+		video->renderer->writePalette(video->renderer, 12, video->palette[12]);
 		break;
 	case SGB_PAL23:
 		video->palette[9] = data[3] | (data[4] << 8);
@@ -645,9 +645,9 @@ void GBVideoWriteSGBPacket(struct GBVideo* video, uint8_t* data) {
 		video->renderer->writePalette(video->renderer, 1, video->palette[1]);
 		video->renderer->writePalette(video->renderer, 2, video->palette[2]);
 		video->renderer->writePalette(video->renderer, 3, video->palette[3]);
-		video->renderer->writePalette(video->renderer, 4, video->palette[0]);
-		video->renderer->writePalette(video->renderer, 8, video->palette[0]);
-		video->renderer->writePalette(video->renderer, 12, video->palette[0]);
+		video->renderer->writePalette(video->renderer, 4, video->palette[4]);
+		video->renderer->writePalette(video->renderer, 8, video->palette[8]);
+		video->renderer->writePalette(video->renderer, 12, video->palette[12]);
 		video->renderer->writePalette(video->renderer, 13, video->palette[13]);
 		video->renderer->writePalette(video->renderer, 14, video->palette[14]);
 		video->renderer->writePalette(video->renderer, 15, video->palette[15]);
@@ -675,7 +675,7 @@ void GBVideoWriteSGBPacket(struct GBVideo* video, uint8_t* data) {
 				continue;
 			}
 			LOAD_16LE(video->palette[i * 4 + 0], entry * 8 + 0, video->renderer->sgbPalRam);
-			video->renderer->writePalette(video->renderer, i * 4 + 0, video->palette[0]);
+			video->renderer->writePalette(video->renderer, i * 4 + 0, video->palette[i * 4 + 0]);
 			LOAD_16LE(video->palette[i * 4 + 1], entry * 8 + 2, video->renderer->sgbPalRam);
 			video->renderer->writePalette(video->renderer, i * 4 + 1, video->palette[i * 4 + 1]);
 			LOAD_16LE(video->palette[i * 4 + 2], entry * 8 + 4, video->renderer->sgbPalRam);