diff options
Diffstat (limited to 'src/mesa/state_tracker/st_cb_readpixels.c')
| -rw-r--r-- | src/mesa/state_tracker/st_cb_readpixels.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c index 2bcc8c99fb..29a06ffaa9 100644 --- a/src/mesa/state_tracker/st_cb_readpixels.c +++ b/src/mesa/state_tracker/st_cb_readpixels.c @@ -129,6 +129,34 @@ st_read_stencil_pixels(GLcontext *ctx, GLint x, GLint y, /** + * Return renderbuffer to use for reading color pixels for glRead/CopyPixel + * commands. + * Special care is needed for the front buffer. + */ +struct st_renderbuffer * +st_get_color_read_renderbuffer(GLcontext *ctx) +{ + struct gl_framebuffer *fb = ctx->ReadBuffer; + struct st_renderbuffer *strb = + st_renderbuffer(fb->_ColorReadBuffer); + struct st_renderbuffer *front = + st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer); + + if (strb == front + && ctx->st->frontbuffer_status == FRONT_STATUS_COPY_OF_BACK) { + /* reading from front color buffer, which is a logical copy of the + * back color buffer. + */ + struct st_renderbuffer *back = + st_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer); + strb = back; + } + + return strb; +} + + +/** * Do glReadPixels by getting rows from the framebuffer surface with * get_tile(). Convert to requested format/type with Mesa image routines. * Image transfer ops are done in software too. @@ -173,12 +201,13 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer); } else { - strb = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer); + /* Read color buffer */ + strb = st_get_color_read_renderbuffer(ctx); } + if (!strb) return; - if (format == GL_RGBA && type == GL_FLOAT) { /* write tile(row) directly into user's buffer */ df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width, |