From e6432710d8a586386b3c7025e845cf4f80830da3 Mon Sep 17 00:00:00 2001
From: marha <marha@users.sourceforge.net>
Date: Wed, 25 Jan 2012 08:24:51 +0100
Subject: mesa git update 25 jan 2012

---
 mesalib/src/mesa/swrast/s_copypix.c | 55 +++++++++++++++++++++++++++++++++++--
 1 file changed, 53 insertions(+), 2 deletions(-)

(limited to 'mesalib/src/mesa/swrast/s_copypix.c')

diff --git a/mesalib/src/mesa/swrast/s_copypix.c b/mesalib/src/mesa/swrast/s_copypix.c
index 1e0f9fe7d..592d35a98 100644
--- a/mesalib/src/mesa/swrast/s_copypix.c
+++ b/mesalib/src/mesa/swrast/s_copypix.c
@@ -148,7 +148,7 @@ copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
       p = tmpImage;
       for (row = 0; row < height; row++) {
          _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
-                                 width, srcx, sy + row, GL_FLOAT, p );
+                                 width, srcx, sy + row, p );
          p += width * 4;
       }
       p = tmpImage;
@@ -172,7 +172,7 @@ copy_rgba_pixels(struct gl_context *ctx, GLint srcx, GLint srcy,
       else {
          /* get from framebuffer */
          _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
-                                 width, srcx, sy, GL_FLOAT, rgba );
+                                 width, srcx, sy, rgba );
       }
 
       if (transferOps) {
@@ -557,6 +557,49 @@ swrast_fast_copy_pixels(struct gl_context *ctx,
 }
 
 
+/**
+ * Find/map the renderbuffer that we'll be reading from.
+ * The swrast_render_start() function only maps the drawing buffers,
+ * not the read buffer.
+ */
+static struct gl_renderbuffer *
+map_readbuffer(struct gl_context *ctx, GLenum type)
+{
+   struct gl_framebuffer *fb = ctx->ReadBuffer;
+   struct gl_renderbuffer *rb;
+   struct swrast_renderbuffer *srb;
+
+   switch (type) {
+   case GL_COLOR:
+      rb = fb->Attachment[fb->_ColorReadBufferIndex].Renderbuffer;
+      break;
+   case GL_DEPTH:
+   case GL_DEPTH_STENCIL:
+      rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
+      break;
+   case GL_STENCIL:
+      rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
+      break;
+   default:
+      return NULL;
+   }
+
+   srb = swrast_renderbuffer(rb);
+
+   if (!srb || srb->Map) {
+      /* no buffer, or buffer is mapped already, we're done */
+      return NULL;
+   }
+
+   ctx->Driver.MapRenderbuffer(ctx, rb,
+                               0, 0, rb->Width, rb->Height,
+                               GL_MAP_READ_BIT,
+                               &srb->Map, &srb->RowStride);
+
+   return rb;
+}
+
+
 /**
  * Do software-based glCopyPixels.
  * By time we get here, all parameters will have been error-checked.
@@ -567,6 +610,7 @@ _swrast_CopyPixels( struct gl_context *ctx,
 		    GLint destx, GLint desty, GLenum type )
 {
    SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   struct gl_renderbuffer *rb;
       
    if (!_mesa_check_conditional_render(ctx))
       return; /* don't copy */
@@ -585,6 +629,7 @@ _swrast_CopyPixels( struct gl_context *ctx,
    }
 
    swrast_render_start(ctx);
+   rb = map_readbuffer(ctx, type);
 
    switch (type) {
    case GL_COLOR:
@@ -606,4 +651,10 @@ _swrast_CopyPixels( struct gl_context *ctx,
    }
 
    swrast_render_finish(ctx);
+
+   if (rb) {
+      struct swrast_renderbuffer *srb = swrast_renderbuffer(rb);
+      ctx->Driver.UnmapRenderbuffer(ctx, rb);
+      srb->Map = NULL;
+   }
 }
-- 
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