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st: when creating an on-demand front color buffer, init to back buffer image

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When we create a new front color buffer (user called glDrawBuffer(GL_FRONT))
initialize it to the contents of the back buffer.  Any previous call to
SwapBuffers() would have done that in effect, so make it reality.
This commit is contained in:
Brian Paul 2009-05-01 12:48:46 -06:00
parent b85b315ebb
commit 3f52a853f7
1 changed files with 31 additions and 1 deletions
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32
src/mesa/state_tracker/st_cb_fbo.c
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@ -454,6 +454,31 @@ st_validate_framebuffer(GLcontext *ctx, struct gl_framebuffer *fb)
}
/**
* Copy back color buffer to front color buffer.
*/
static void
copy_back_to_front(struct st_context *st,
struct gl_framebuffer *fb,
gl_buffer_index frontIndex,
gl_buffer_index backIndex)
{
struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
struct pipe_surface *surf_front, *surf_back;
(void) st_get_framebuffer_surface(stfb, frontIndex, &surf_front);
(void) st_get_framebuffer_surface(stfb, backIndex, &surf_back);
if (surf_front && surf_back) {
st->pipe->surface_copy(st->pipe,
surf_front, 0, 0, /* dest */
surf_back, 0, 0, /* src */
fb->Width, fb->Height);
}
}
/**
* Check if we're drawing into, or read from, a front color buffer. If the
* front buffer is missing, create it now.
@ -493,7 +518,7 @@ check_create_front_buffer(GLcontext *ctx, struct gl_framebuffer *fb,
uint samples;
if (0)
_mesa_debug(ctx, "Allocate new front buffer");
_mesa_debug(ctx, "Allocate new front buffer\n");
/* get back renderbuffer info */
back = st_renderbuffer(fb->Attachment[backIndex].Renderbuffer);
@ -507,6 +532,11 @@ check_create_front_buffer(GLcontext *ctx, struct gl_framebuffer *fb,
/* alloc texture/surface for new front buffer */
front->AllocStorage(ctx, front, front->InternalFormat,
fb->Width, fb->Height);
/* initialize the front color buffer contents by copying
* the back buffer.
*/
copy_back_to_front(ctx->st, fb, frontIndex, backIndex);
}
}
}