spantmp2: Add support for GL_BGR / GL_UNSIGNED_INT_8_8_8_8_REV

This is really for MESA_FORMAT_XRGB8888.  Clearly spantmp2.h needs some
re-work.  Any volunteers?

diff --git a/src/mesa/drivers/dri/common/spantmp2.h b/src/mesa/drivers/dri/common/spantmp2.h
index 95f97414a9839d432275f0adb2ff607878b44cca..447f3d15b9516c2c7aca30f47beb68caaf6bde76 100644 (file)
--- a/src/mesa/drivers/dri/common/spantmp2.h
+++ b/src/mesa/drivers/dri/common/spantmp2.h
@@ -356,6 +356,63 @@
      } while (0)
 # endif
 
+#elif (SPANTMP_PIXEL_FMT == GL_BGR) && (SPANTMP_PIXEL_TYPE == GL_UNSIGNED_INT_8_8_8_8_REV)
+
+/**
+ ** GL_BGR, GL_UNSIGNED_INT_8_8_8_8_REV
+ **
+ ** This is really for MESA_FORMAT_XRGB8888.  The spantmp code needs to be
+ ** kicked to the curb, and we need to just code-gen this.
+ **/
+
+#ifndef GET_VALUE
+#ifndef GET_PTR
+#define GET_PTR(_x, _y) (     buf + (_x) * 4 + (_y) * pitch)
+#endif
+
+#define GET_VALUE(_x, _y) *(volatile GLuint *)(GET_PTR(_x, _y))
+#define PUT_VALUE(_x, _y, _v) *(volatile GLuint *)(GET_PTR(_x, _y)) = (_v)
+#endif /* GET_VALUE */
+
+# define INIT_MONO_PIXEL(p, color)                       \
+     p = PACK_COLOR_8888(0xff, color[0], color[1], color[2])
+
+# define WRITE_RGBA(_x, _y, r, g, b, a)                                        \
+   PUT_VALUE(_x, _y, ((r << 16) |                                      \
+                     (g << 8) |                                        \
+                     (b << 0) |                                        \
+                     (0xff << 24)))
+
+#define WRITE_PIXEL(_x, _y, p) PUT_VALUE(_x, _y, p)
+
+# if defined( USE_X86_ASM )
+#  define READ_RGBA(rgba, _x, _y)                                       \
+    do {                                                                \
+       GLuint p = GET_VALUE(_x, _y);                                   \
+       __asm__ __volatile__( "bswap    %0; rorl $8, %0"                \
+                               : "=r" (p) : "0" (p) );                 \
+       ((GLuint *)rgba)[0] = p | 0xff000000;                           \
+    } while (0)
+# elif defined( MESA_BIG_ENDIAN )
+    /* On PowerPC with GCC 3.4.2 the shift madness below becomes a single
+     * rotlwi instruction.  It also produces good code on SPARC.
+     */
+#  define READ_RGBA( rgba, _x, _y )                                    \
+     do {                                                              \
+        GLuint p = GET_VALUE(_x, _y);                                  \
+        *((uint32_t *) rgba) = (t << 8) | 0xff;                                \
+     } while (0)
+# else
+#  define READ_RGBA( rgba, _x, _y )                                    \
+     do {                                                              \
+        GLuint p = GET_VALUE(_x, _y);                                  \
+       rgba[0] = (p >> 16) & 0xff;                                     \
+       rgba[1] = (p >>  8) & 0xff;                                     \
+       rgba[2] = (p >>  0) & 0xff;                                     \
+       rgba[3] = 0xff;                                                 \
+     } while (0)
+# endif
+
 #else
 #error SPANTMP_PIXEL_FMT must be set to a valid value!
 #endif