+ uint cmask = 0x0; /* each byte corresponds to a color channel */
+
+ /* Form bitmask depending on color buffer format and colormask bits */
+ switch (spu.fb.color_format) {
+ case PIPE_FORMAT_A8R8G8B8_UNORM:
+ if (spu.blend.colormask & PIPE_MASK_R)
+ cmask |= 0x00ff0000; /* red */
+ if (spu.blend.colormask & PIPE_MASK_G)
+ cmask |= 0x0000ff00; /* green */
+ if (spu.blend.colormask & PIPE_MASK_B)
+ cmask |= 0x000000ff; /* blue */
+ if (spu.blend.colormask & PIPE_MASK_A)
+ cmask |= 0xff000000; /* alpha */
+ break;
+ case PIPE_FORMAT_B8G8R8A8_UNORM:
+ if (spu.blend.colormask & PIPE_MASK_R)
+ cmask |= 0x0000ff00; /* red */
+ if (spu.blend.colormask & PIPE_MASK_G)
+ cmask |= 0x00ff0000; /* green */
+ if (spu.blend.colormask & PIPE_MASK_B)
+ cmask |= 0xff000000; /* blue */
+ if (spu.blend.colormask & PIPE_MASK_A)
+ cmask |= 0x000000ff; /* alpha */
+ break;
+ default:
+ ASSERT(0);
+ }
+
+ /*
+ * Apply color mask to the 32-bit packed colors.
+ * if (cmask[i])
+ * frag color[i] = frag color[i];
+ * else
+ * frag color[i] = framebuffer color[i];
+ */
+ fragc0 = (fragc0 & cmask) | (fbc0 & ~cmask);
+ fragc1 = (fragc1 & cmask) | (fbc1 & ~cmask);
+ fragc2 = (fragc2 & cmask) | (fbc2 & ~cmask);
+ fragc3 = (fragc3 & cmask) | (fbc3 & ~cmask);