patch to import Jon Smirl's work from Bitkeeper

1 files changed, 29 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/mga/mgaspan.c b/src/mesa/drivers/dri/mga/mgaspan.c
index 8dc971cfc57..684239865f7 100644
--- a/src/mesa/drivers/dri/mga/mgaspan.c
+++ b/src/mesa/drivers/dri/mga/mgaspan.c
@@ -116,7 +116,7 @@
 
 #undef INIT_MONO_PIXEL
 #define INIT_MONO_PIXEL(p, color) \
-  p = MGAPACKCOLOR565( color[0], color[1], color[2] )
+  p = PACK_COLOR_565( color[0], color[1], color[2] )
 
 
 #define WRITE_RGBA( _x, _y, r, g, b, a )				\
@@ -148,7 +148,7 @@ do {								\
 
 #undef INIT_MONO_PIXEL
 #define INIT_MONO_PIXEL(p, color) \
-  p = MGAPACKCOLOR8888( color[0], color[1], color[2], color[3] )
+  p = PACK_COLOR_8888( color[3], color[0], color[1], color[2] )
 
 
 #define WRITE_RGBA(_x, _y, r, g, b, a)			\
@@ -233,11 +233,38 @@ do {								\
 
 
 
+/*
+ * This function is called to specify which buffer to read and write
+ * for software rasterization (swrast) fallbacks.  This doesn't necessarily
+ * correspond to glDrawBuffer() or glReadBuffer() calls.
+ */
+static void mgaDDSetBuffer(GLcontext *ctx, GLframebuffer *buffer,
+                           GLuint bufferBit)
+{
+   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
+
+   if (bufferBit == FRONT_LEFT_BIT) 
+   {
+      mmesa->drawOffset = mmesa->mgaScreen->frontOffset;
+      mmesa->readOffset = mmesa->mgaScreen->frontOffset;
+   } 
+   else if (bufferBit == BACK_LEFT_BIT)
+   {
+      mmesa->drawOffset = mmesa->mgaScreen->backOffset;
+      mmesa->readOffset = mmesa->mgaScreen->backOffset;
+   }
+   else {
+      assert(0);
+   }
+}
+
 void mgaDDInitSpanFuncs( GLcontext *ctx )
 {
    mgaContextPtr mmesa = MGA_CONTEXT(ctx);
    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference(ctx);
 
+   swdd->SetBuffer = mgaDDSetBuffer;
+
    switch (mmesa->mgaScreen->cpp) {
    case 2:
       swdd->WriteRGBASpan = mgaWriteRGBASpan_565;