Mesa (master): mesa: don't map depth+stencil buffer twice in glReadPixels()
Brian Paul
brianp at kemper.freedesktop.org
Wed Nov 16 15:58:59 UTC 2011
Module: Mesa
Branch: master
Commit: f6a50c0b1ff620d1b721968144a56452c0bd6d85
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=f6a50c0b1ff620d1b721968144a56452c0bd6d85
Author: Brian Paul <brianp at vmware.com>
Date: Wed Nov 16 07:47:51 2011 -0700
mesa: don't map depth+stencil buffer twice in glReadPixels()
In slow_read_depth_stencil_pixels_separate() we might have separate
depth and stencil buffers or a combined buffer. In the later case,
don't map the buffer twice. This function is used when the depth
scale/bias pixel transfer values are not the defaults.
Fixes http://bugs.freedesktop.org/show_bug.cgi?id=42963
Reviewed-by: José Fonseca <jfonseca at vmware.com>
---
src/mesa/main/readpix.c | 14 +++++++++++---
1 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index 8550618..0b41de6 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -402,10 +402,16 @@ slow_read_depth_stencil_pixels_separate(struct gl_context *ctx,
GLubyte *depthMap, *stencilMap;
int depthStride, stencilStride, j;
+ /* The depth and stencil buffers might be separate, or a single buffer.
+ * If one buffer, only map it once.
+ */
ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height,
GL_MAP_READ_BIT, &depthMap, &depthStride);
- ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height,
- GL_MAP_READ_BIT, &stencilMap, &stencilStride);
+ if (stencilRb != depthRb) {
+ ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height,
+ GL_MAP_READ_BIT, &stencilMap,
+ &stencilStride);
+ }
for (j = 0; j < height; j++) {
GLubyte stencilVals[MAX_WIDTH];
@@ -424,7 +430,9 @@ slow_read_depth_stencil_pixels_separate(struct gl_context *ctx,
}
ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
- ctx->Driver.UnmapRenderbuffer(ctx, stencilRb);
+ if (stencilRb != depthRb) {
+ ctx->Driver.UnmapRenderbuffer(ctx, stencilRb);
+ }
}
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