+static boolean blend_discard_if_src_alpha_0(unsigned srcRGB, unsigned srcA,
+ unsigned dstRGB, unsigned dstA)
+{
+ /* If the blend equation is ADD or REVERSE_SUBTRACT,
+ * SRC_ALPHA == 0, and the following state is set, the colorbuffer
+ * will not be changed.
+ * Notice that the dst factors are the src factors inverted. */
+ return (srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE ||
+ srcRGB == PIPE_BLENDFACTOR_ZERO) &&
+ (srcA == PIPE_BLENDFACTOR_SRC_COLOR ||
+ srcA == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ srcA == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE ||
+ srcA == PIPE_BLENDFACTOR_ZERO) &&
+ (dstRGB == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ dstRGB == PIPE_BLENDFACTOR_ONE) &&
+ (dstA == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ dstA == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ dstA == PIPE_BLENDFACTOR_ONE);
+}
+
+static boolean blend_discard_if_src_alpha_1(unsigned srcRGB, unsigned srcA,
+ unsigned dstRGB, unsigned dstA)
+{
+ /* If the blend equation is ADD or REVERSE_SUBTRACT,
+ * SRC_ALPHA == 1, and the following state is set, the colorbuffer
+ * will not be changed.
+ * Notice that the dst factors are the src factors inverted. */
+ return (srcRGB == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ srcRGB == PIPE_BLENDFACTOR_ZERO) &&
+ (srcA == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ srcA == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ srcA == PIPE_BLENDFACTOR_ZERO) &&
+ (dstRGB == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ dstRGB == PIPE_BLENDFACTOR_ONE) &&
+ (dstA == PIPE_BLENDFACTOR_SRC_COLOR ||
+ dstA == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ dstA == PIPE_BLENDFACTOR_ONE);
+}
+
+static boolean blend_discard_if_src_color_0(unsigned srcRGB, unsigned srcA,
+ unsigned dstRGB, unsigned dstA)
+{
+ /* If the blend equation is ADD or REVERSE_SUBTRACT,
+ * SRC_COLOR == (0,0,0), and the following state is set, the colorbuffer
+ * will not be changed.
+ * Notice that the dst factors are the src factors inverted. */
+ return (srcRGB == PIPE_BLENDFACTOR_SRC_COLOR ||
+ srcRGB == PIPE_BLENDFACTOR_ZERO) &&
+ (srcA == PIPE_BLENDFACTOR_ZERO) &&
+ (dstRGB == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ dstRGB == PIPE_BLENDFACTOR_ONE) &&
+ (dstA == PIPE_BLENDFACTOR_ONE);
+}
+
+static boolean blend_discard_if_src_color_1(unsigned srcRGB, unsigned srcA,
+ unsigned dstRGB, unsigned dstA)
+{
+ /* If the blend equation is ADD or REVERSE_SUBTRACT,
+ * SRC_COLOR == (1,1,1), and the following state is set, the colorbuffer
+ * will not be changed.
+ * Notice that the dst factors are the src factors inverted. */
+ return (srcRGB == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ srcRGB == PIPE_BLENDFACTOR_ZERO) &&
+ (srcA == PIPE_BLENDFACTOR_ZERO) &&
+ (dstRGB == PIPE_BLENDFACTOR_SRC_COLOR ||
+ dstRGB == PIPE_BLENDFACTOR_ONE) &&
+ (dstA == PIPE_BLENDFACTOR_ONE);
+}
+
+static boolean blend_discard_if_src_alpha_color_0(unsigned srcRGB, unsigned srcA,
+ unsigned dstRGB, unsigned dstA)
+{
+ /* If the blend equation is ADD or REVERSE_SUBTRACT,
+ * SRC_ALPHA_COLOR == (0,0,0,0), and the following state is set,
+ * the colorbuffer will not be changed.
+ * Notice that the dst factors are the src factors inverted. */
+ return (srcRGB == PIPE_BLENDFACTOR_SRC_COLOR ||
+ srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ srcRGB == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE ||
+ srcRGB == PIPE_BLENDFACTOR_ZERO) &&
+ (srcA == PIPE_BLENDFACTOR_SRC_COLOR ||
+ srcA == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ srcA == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE ||
+ srcA == PIPE_BLENDFACTOR_ZERO) &&
+ (dstRGB == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ dstRGB == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ dstRGB == PIPE_BLENDFACTOR_ONE) &&
+ (dstA == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ dstA == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ dstA == PIPE_BLENDFACTOR_ONE);
+}
+
+static boolean blend_discard_if_src_alpha_color_1(unsigned srcRGB, unsigned srcA,
+ unsigned dstRGB, unsigned dstA)
+{
+ /* If the blend equation is ADD or REVERSE_SUBTRACT,
+ * SRC_ALPHA_COLOR == (1,1,1,1), and the following state is set,
+ * the colorbuffer will not be changed.
+ * Notice that the dst factors are the src factors inverted. */
+ return (srcRGB == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ srcRGB == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ srcRGB == PIPE_BLENDFACTOR_ZERO) &&
+ (srcA == PIPE_BLENDFACTOR_INV_SRC_COLOR ||
+ srcA == PIPE_BLENDFACTOR_INV_SRC_ALPHA ||
+ srcA == PIPE_BLENDFACTOR_ZERO) &&
+ (dstRGB == PIPE_BLENDFACTOR_SRC_COLOR ||
+ dstRGB == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ dstRGB == PIPE_BLENDFACTOR_ONE) &&
+ (dstA == PIPE_BLENDFACTOR_SRC_COLOR ||
+ dstA == PIPE_BLENDFACTOR_SRC_ALPHA ||
+ dstA == PIPE_BLENDFACTOR_ONE);
+}
+
+static unsigned bgra_cmask(unsigned mask)
+{
+ /* Gallium uses RGBA color ordering while R300 expects BGRA. */
+
+ return ((mask & PIPE_MASK_R) << 2) |
+ ((mask & PIPE_MASK_B) >> 2) |
+ (mask & (PIPE_MASK_G | PIPE_MASK_A));
+}
+