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path: root/mesalib/src/mesa/state_tracker/st_cb_fbo.c
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Diffstat (limited to 'mesalib/src/mesa/state_tracker/st_cb_fbo.c')
-rw-r--r--mesalib/src/mesa/state_tracker/st_cb_fbo.c32
1 files changed, 27 insertions, 5 deletions
diff --git a/mesalib/src/mesa/state_tracker/st_cb_fbo.c b/mesalib/src/mesa/state_tracker/st_cb_fbo.c
index e04cb4406..a351d1197 100644
--- a/mesalib/src/mesa/state_tracker/st_cb_fbo.c
+++ b/mesalib/src/mesa/state_tracker/st_cb_fbo.c
@@ -355,8 +355,12 @@ st_render_texture(struct gl_context *ctx,
/* get pointer to texture image we're rendeing to */
texImage = _mesa_get_attachment_teximage(att);
- /* create new renderbuffer which wraps the texture image */
- rb = st_new_renderbuffer(ctx, 0);
+ /* create new renderbuffer which wraps the texture image.
+ * Use the texture's name as the renderbuffer's name so that we have
+ * something that's non-zero (to determine vertical orientation) and
+ * possibly helpful for debugging.
+ */
+ rb = st_new_renderbuffer(ctx, att->Texture->Name);
if (!rb) {
_mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
return;
@@ -644,7 +648,9 @@ st_MapRenderbuffer(struct gl_context *ctx,
struct st_context *st = st_context(ctx);
struct st_renderbuffer *strb = st_renderbuffer(rb);
struct pipe_context *pipe = st->pipe;
+ const GLboolean invert = rb->Name == 0;
unsigned usage;
+ GLuint y2;
usage = 0x0;
if (mode & GL_MAP_READ_BIT)
@@ -652,14 +658,30 @@ st_MapRenderbuffer(struct gl_context *ctx,
if (mode & GL_MAP_WRITE_BIT)
usage |= PIPE_TRANSFER_WRITE;
+ /* Note: y=0=bottom of buffer while y2=0=top of buffer.
+ * 'invert' will be true for window-system buffers and false for
+ * user-allocated renderbuffers and textures.
+ */
+ if (invert)
+ y2 = strb->Base.Height - y - h;
+ else
+ y2 = y;
+
strb->transfer = pipe_get_transfer(pipe,
strb->texture,
strb->rtt_level,
strb->rtt_face + strb->rtt_slice,
- usage, x, y, w, h);
+ usage, x, y2, w, h);
if (strb->transfer) {
- *mapOut = pipe_transfer_map(pipe, strb->transfer);
- *rowStrideOut = strb->transfer->stride;
+ GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
+ if (invert) {
+ *rowStrideOut = -strb->transfer->stride;
+ map += (h - 1) * strb->transfer->stride;
+ }
+ else {
+ *rowStrideOut = strb->transfer->stride;
+ }
+ *mapOut = map;
}
else {
*mapOut = NULL;