Major check-in of changes for GL_EXT_framebuffer_object extension.

Main driver impacts:
- new code for creating the Mesa GLframebuffer
- new span/pixel read/write code
Some drivers not yet updated/tested.

1 files changed, 178 insertions, 159 deletions

diff --git a/src/mesa/drivers/x11/xm_tri.c b/src/mesa/drivers/x11/xm_tri.c
index 8fd22ccf4e8..8b5c39392a9 100644
--- a/src/mesa/drivers/x11/xm_tri.c
+++ b/src/mesa/drivers/x11/xm_tri.c
@@ -44,6 +44,9 @@
 #include "swrast/s_triangle.h"
 
 
+#define GET_XRB(XRB)  struct xmesa_renderbuffer *XRB = \
+   (struct xmesa_renderbuffer *) ctx->DrawBuffer->_ColorDrawBuffers[0][0]
+
 
 /**********************************************************************/
 /***                   Triangle rendering                           ***/
@@ -59,10 +62,10 @@
 #define INTERP_RGB 1
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);
 
 #define RENDER_SPAN( span )					\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    GLuint i;							\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
@@ -70,7 +73,7 @@
          unsigned long p;					\
          PACK_TRUECOLOR(p, FixedToInt(span.red),		\
             FixedToInt(span.green), FixedToInt(span.blue));	\
-         XMesaPutPixel(img, x, y, p);				\
+         XMesaPutPixel(xrb->ximage, x, y, p);			\
          zRow[i] = z;						\
       }								\
       span.red += span.redStep;					\
@@ -91,12 +94,11 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    for (i = 0; i < span.end; i++) {				\
@@ -123,11 +125,11 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);
 
 #define RENDER_SPAN( span )					\
    GLuint i;							\
@@ -155,11 +157,11 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);
 
 #define RENDER_SPAN( span )					\
    GLuint i;							\
@@ -187,11 +189,11 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR3(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR3(xrb, X, Y)
 #define PIXEL_TYPE bgr_t
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span ) 					\
    GLuint i;							\
    for (i = 0; i < span.end; i++) {				\
@@ -221,17 +223,17 @@
 #define INTERP_RGB 1
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
          unsigned long p;					\
          PACK_TRUEDITHER(p, x, y, FixedToInt(span.red),		\
             FixedToInt(span.green), FixedToInt(span.blue));	\
-         XMesaPutPixel(img, x, y, p);				\
+         XMesaPutPixel(xrb->ximage, x, y, p);			\
          zRow[i] = z;						\
       }								\
       span.red += span.redStep;					\
@@ -250,11 +252,11 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    for (i = 0; i < span.end; i++) {				\
@@ -280,14 +282,15 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
@@ -311,14 +314,14 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    XDITHER_SETUP(y);						\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
@@ -344,11 +347,11 @@
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    XDITHER_SETUP(y);						\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
@@ -374,11 +377,11 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    LOOKUP_SETUP;						\
@@ -405,14 +408,15 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
@@ -437,12 +441,13 @@
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;		\
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;				\
    unsigned long pixel;						\
    PACK_TRUECOLOR(pixel, v2->color[0], v2->color[1], v2->color[2]);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
@@ -461,13 +466,12 @@
 #define NAME flat_8A8B8G8R_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
-   unsigned long p = PACK_8B8G8R( v2->color[0],		\
-		 v2->color[1], v2->color[2] );
+   GET_XRB(xrb);					\
+   GLuint p = PACK_8B8G8R( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )				\
    GLuint i;						\
    for (i = 0; i < span.end; i++) {			\
@@ -488,13 +492,12 @@
 #define NAME flat_8A8R8G8B_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
-   unsigned long p = PACK_8R8G8B( v2->color[0],		\
-		 v2->color[1], v2->color[2] );
+   GET_XRB(xrb);					\
+   GLuint p = PACK_8R8G8B( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )				\
    GLuint i;						\
    for (i = 0; i < span.end; i++) {			\
@@ -515,13 +518,12 @@
 #define NAME flat_8R8G8B_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
-   unsigned long p = PACK_8R8G8B( v2->color[0],		\
-		 v2->color[1], v2->color[2] );
+   GET_XRB(xrb);					\
+   GLuint p = PACK_8R8G8B( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )			\
    GLuint i;					\
    for (i = 0; i < span.end; i++) {		\
@@ -529,9 +531,12 @@
       if (z < zRow[i]) {			\
 	 pRow[i] = (PIXEL_TYPE) p;		\
          zRow[i] = z;				\
+         if (span.y == 100) printf("pass\n");\
       }						\
+      else   if (span.y == 100) printf("fail\n");\
       span.z += span.zStep;			\
    }
+
 #include "swrast/s_tritemp.h"
 
 
@@ -542,11 +547,11 @@
 #define NAME flat_8R8G8B24_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR3(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR3(xrb, X, Y)
 #define PIXEL_TYPE bgr_t
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    const GLubyte *color = v2->color;
 #define RENDER_SPAN( span )				\
    GLuint i;						\
@@ -573,10 +578,11 @@
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
@@ -598,13 +604,12 @@
 #define NAME flat_5R6G5B_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
-   unsigned long p = PACK_5R6G5B( v2->color[0],		\
-            v2->color[1], v2->color[2] );
+   GET_XRB(xrb);					\
+   GLushort p = PACK_5R6G5B( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )				\
    GLuint i;						\
    for (i = 0; i < span.end; i++) {			\
@@ -625,15 +630,16 @@
 #define NAME flat_DITHER_5R6G5B_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);						\
    const GLubyte *color = v2->color;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
@@ -653,16 +659,16 @@
 #define NAME flat_DITHER8_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);						\
    FLAT_DITHER_SETUP( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
-   FLAT_DITHER_ROW_SETUP(FLIP(xmesa->xm_buffer, y));		\
+   GLint x = span.x, y = YFLIP(xrb, span.y);			\
+   FLAT_DITHER_ROW_SETUP(YFLIP(xrb, y));			\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
@@ -682,12 +688,12 @@
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;		\
+   GET_XRB(xrb);					\
+   XMesaImage *img = xrb->ximage;		\
    FLAT_DITHER_SETUP( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    FLAT_DITHER_ROW_SETUP(y);					\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
@@ -708,17 +714,18 @@
 #define NAME flat_HPCR_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);						\
    GLubyte r = v2->color[0];					\
    GLubyte g = v2->color[1];					\
    GLubyte b = v2->color[2];
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       const DEPTH_TYPE z = FixedToDepth(span.z);		\
       if (z < zRow[i]) {					\
@@ -737,11 +744,11 @@
 #define NAME flat_LOOKUP8_z_triangle
 #define INTERP_Z 1
 #define DEPTH_TYPE DEFAULT_SOFTWARE_DEPTH_TYPE
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    LOOKUP_SETUP;					\
    GLubyte r = v2->color[0];				\
    GLubyte g = v2->color[1];				\
@@ -768,10 +775,11 @@
 #define INTERP_RGB 1
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       unsigned long p;						\
       PACK_TRUECOLOR(p, FixedToInt(span.red),			\
@@ -790,11 +798,11 @@
  */
 #define NAME smooth_8A8B8G8R_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    for (i = 0; i < span.end; i++) {				\
@@ -813,11 +821,11 @@
  */
 #define NAME smooth_8A8R8G8B_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    for (i = 0; i < span.end; i++) {				\
@@ -836,11 +844,11 @@
  */
 #define NAME smooth_8R8G8B_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    for (i = 0; i < span.end; i++) {				\
@@ -859,11 +867,11 @@
  */
 #define NAME smooth_8R8G8B24_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR3(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR3(xrb, X, Y)
 #define PIXEL_TYPE bgr_t
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )				\
    GLuint i;						\
    PIXEL_TYPE *pixel = pRow;				\
@@ -886,10 +894,11 @@
 #define INTERP_RGB 1
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       unsigned long p;						\
       PACK_TRUEDITHER(p, x, y, FixedToInt(span.red),		\
@@ -908,11 +917,11 @@
  */
 #define NAME smooth_5R6G5B_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    for (i = 0; i < span.end; i++) {				\
@@ -931,14 +940,15 @@
  */
 #define NAME smooth_DITHER_5R6G5B_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       PACK_TRUEDITHER(pRow[i], x, y, FixedToInt(span.red),	\
          FixedToInt(span.green), FixedToInt(span.blue));	\
@@ -955,14 +965,14 @@
  */
 #define NAME smooth_DITHER8_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    XDITHER_SETUP(y);						\
    for (i = 0; i < span.end; i++, x++) {			\
       pRow[i] = (PIXEL_TYPE) XDITHER(x, FixedToInt(span.red),	\
@@ -981,11 +991,11 @@
 #define NAME smooth_DITHER_triangle
 #define INTERP_RGB 1
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    XDITHER_SETUP(y);						\
    for (i = 0; i < span.end; i++, x++) {			\
       unsigned long p = XDITHER(x, FixedToInt(span.red),	\
@@ -1004,11 +1014,11 @@
  */
 #define NAME smooth_LOOKUP8_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
    LOOKUP_SETUP;						\
@@ -1028,14 +1038,15 @@
  */
 #define NAME smooth_HPCR_triangle
 #define INTERP_RGB 1
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);
+   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       pRow[i] = DITHER_HPCR(x, y, FixedToInt(span.red),		\
          FixedToInt(span.green), FixedToInt(span.blue));	\
@@ -1053,12 +1064,13 @@
 #define NAME flat_TRUECOLOR_triangle
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;		\
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;				\
    unsigned long pixel;						\
    PACK_TRUECOLOR(pixel, v2->color[0], v2->color[1], v2->color[2]);
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       XMesaPutPixel(img, x, y, pixel);				\
    }
@@ -1070,11 +1082,11 @@
  * XImage, flat, NON-depth-buffered, PF_8A8B8G8R triangle.
  */
 #define NAME flat_8A8B8G8R_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    unsigned long p = PACK_8B8G8R( v2->color[0],		\
 		 v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )				\
@@ -1090,11 +1102,11 @@
  * XImage, flat, NON-depth-buffered, PF_8A8R8G8B triangle.
  */
 #define NAME flat_8A8R8G8B_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    unsigned long p = PACK_8R8G8B( v2->color[0],		\
 		 v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )				\
@@ -1110,11 +1122,11 @@
  * XImage, flat, NON-depth-buffered, PF_8R8G8B triangle.
  */
 #define NAME flat_8R8G8B_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR4(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR4(xrb, X, Y)
 #define PIXEL_TYPE GLuint
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    unsigned long p = PACK_8R8G8B( v2->color[0],		\
 		 v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )				\
@@ -1130,11 +1142,11 @@
  * XImage, flat, NON-depth-buffered, PF_8R8G8B24 triangle.
  */
 #define NAME flat_8R8G8B24_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR3(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR3(xrb, X, Y)
 #define PIXEL_TYPE bgr_t
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    const GLubyte *color = v2->color;
 #define RENDER_SPAN( span )				\
    GLuint i;						\
@@ -1154,10 +1166,11 @@
 #define NAME flat_TRUEDITHER_triangle
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       unsigned long p;						\
       PACK_TRUEDITHER(p, x, y, v2->color[0],			\
@@ -1172,11 +1185,11 @@
  * XImage, flat, NON-depth-buffered, PF_5R6G5B triangle.
  */
 #define NAME flat_5R6G5B_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    unsigned long p = PACK_5R6G5B( v2->color[0],		\
 		 v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )				\
@@ -1192,15 +1205,16 @@
  * XImage, flat, NON-depth-buffered, PF_DITHER_5R6G5B triangle.
  */
 #define NAME flat_DITHER_5R6G5B_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR2(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR2(xrb, X, Y)
 #define PIXEL_TYPE GLushort
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);						\
    const GLubyte *color = v2->color;
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       PACK_TRUEDITHER(pRow[i], x, y, color[RCOMP],		\
          color[GCOMP], color[BCOMP]);				\
@@ -1213,16 +1227,16 @@
  * XImage, flat, NON-depth-buffered, 8-bit PF_DITHER triangle.
  */
 #define NAME flat_DITHER8_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);						\
    FLAT_DITHER_SETUP( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
-   FLAT_DITHER_ROW_SETUP(FLIP(xmesa->xm_buffer, y));		\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
+   FLAT_DITHER_ROW_SETUP(YFLIP(xrb, y));		\
    for (i = 0; i < span.end; i++, x++) {			\
       pRow[i] = (PIXEL_TYPE) FLAT_DITHER(x);			\
    }
@@ -1235,12 +1249,12 @@
  */
 #define NAME flat_DITHER_triangle
 #define SETUP_CODE						\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
-   XMesaImage *img = xmesa->xm_buffer->backimage;		\
+   GET_XRB(xrb);						\
+   XMesaImage *img = xrb->ximage;				\
    FLAT_DITHER_SETUP( v2->color[0], v2->color[1], v2->color[2] );
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    FLAT_DITHER_ROW_SETUP(y);					\
    for (i = 0; i < span.end; i++, x++) {			\
       unsigned long p = FLAT_DITHER(x);				\
@@ -1254,17 +1268,18 @@
  * XImage, flat, NON-depth-buffered, 8-bit PF_HPCR triangle.
  */
 #define NAME flat_HPCR_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE						\
    XMesaContext xmesa = XMESA_CONTEXT(ctx);			\
+   GET_XRB(xrb);						\
    GLubyte r = v2->color[0];					\
    GLubyte g = v2->color[1];					\
    GLubyte b = v2->color[2];
 #define RENDER_SPAN( span )					\
    GLuint i;							\
-   GLint x = span.x, y = FLIP(xmesa->xm_buffer, span.y);	\
+   GLint x = span.x, y = YFLIP(xrb, span.y);	\
    for (i = 0; i < span.end; i++, x++) {			\
       pRow[i] = (PIXEL_TYPE) DITHER_HPCR(x, y, r, g, b);	\
    }
@@ -1276,11 +1291,11 @@
  * XImage, flat, NON-depth-buffered, 8-bit PF_LOOKUP triangle.
  */
 #define NAME flat_LOOKUP8_triangle
-#define PIXEL_ADDRESS(X,Y) PIXELADDR1(xmesa->xm_buffer,X,Y)
+#define PIXEL_ADDRESS(X,Y) PIXEL_ADDR1(xrb, X, Y)
 #define PIXEL_TYPE GLubyte
-#define BYTES_PER_ROW (xmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (xrb->ximage->bytes_per_line)
 #define SETUP_CODE					\
-   XMesaContext xmesa = XMESA_CONTEXT(ctx);		\
+   GET_XRB(xrb);					\
    LOOKUP_SETUP;					\
    GLubyte r = v2->color[0];				\
    GLubyte g = v2->color[1];				\
@@ -1417,12 +1432,16 @@ static swrast_tri_func get_triangle_func( GLcontext *ctx )
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
    XMesaContext xmesa = XMESA_CONTEXT(ctx);
    int depth = GET_VISUAL_DEPTH(xmesa->xm_visual);
+   struct xmesa_renderbuffer *xrb = (struct xmesa_renderbuffer *)
+      ctx->DrawBuffer->_ColorDrawBuffers[0][0];
 
+   return NULL;
 #ifdef DEBUG
    triFuncName = NULL;
 #endif
 
-   if ((ctx->Color._DrawDestMask[0] & (DD_FRONT_LEFT_BIT | DD_BACK_LEFT_BIT)) ==0)
+   if ((ctx->DrawBuffer->_ColorDrawBufferMask[0]
+        & (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT)) == 0)
       return (swrast_tri_func) NULL;
    if (ctx->RenderMode != GL_RENDER)  return (swrast_tri_func) NULL;
    if (ctx->Polygon.SmoothFlag)       return (swrast_tri_func) NULL;
@@ -1432,7 +1451,7 @@ static swrast_tri_func get_triangle_func( GLcontext *ctx )
        ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
                                         return (swrast_tri_func) NULL;
 
-   if (xmesa->xm_buffer->buffer==XIMAGE) {
+   if (xrb->ximage) {
       if (   ctx->Light.ShadeModel==GL_SMOOTH
           && swrast->_RasterMask==DEPTH_BIT
           && ctx->Depth.Func==GL_LESS