-/**
- * 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) {
- if (st->pipe->surface_copy) {
- st->pipe->surface_copy(st->pipe,
- surf_front, 0, 0, /* dest */
- surf_back, 0, 0, /* src */
- fb->Width, fb->Height);
- } else {
- util_surface_copy(st->pipe, FALSE,
- surf_front, 0, 0,
- surf_back, 0, 0,
- 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.
- *
- * The back color buffer must exist since we'll use its format/samples info
- * for creating the front buffer.
- *
- * \param frontIndex either BUFFER_FRONT_LEFT or BUFFER_FRONT_RIGHT
- * \param backIndex either BUFFER_BACK_LEFT or BUFFER_BACK_RIGHT
- */
-static void
-check_create_front_buffer(GLcontext *ctx, struct gl_framebuffer *fb,
- gl_buffer_index frontIndex,
- gl_buffer_index backIndex)
-{
- if (fb->Attachment[frontIndex].Renderbuffer == NULL) {
- GLboolean create = GL_FALSE;
-
- /* check if drawing to or reading from front buffer */
- if (fb->_ColorReadBufferIndex == frontIndex) {
- create = GL_TRUE;
- }
- else {
- GLuint b;
- for (b = 0; b < fb->_NumColorDrawBuffers; b++) {
- if (fb->_ColorDrawBufferIndexes[b] == frontIndex) {
- create = GL_TRUE;
- break;
- }
- }
- }
-
- if (create) {
- struct st_renderbuffer *back;
- struct gl_renderbuffer *front;
- enum pipe_format colorFormat;
- uint samples;
-
- if (0)
- _mesa_debug(ctx, "Allocate new front buffer\n");
-
- /* get back renderbuffer info */
- back = st_renderbuffer(fb->Attachment[backIndex].Renderbuffer);
- colorFormat = back->format;
- samples = back->Base.NumSamples;
-
- /* create front renderbuffer */
- front = st_new_renderbuffer_fb(colorFormat, samples, FALSE);
- _mesa_add_renderbuffer(fb, frontIndex, front);
-
- /* 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);
- }
- }
-}
-
-
-/**
- * If front left/right color buffers are missing, create them now.
- */
-static void
-check_create_front_buffers(GLcontext *ctx, struct gl_framebuffer *fb)
-{
- /* check if we need to create the front left buffer now */
- check_create_front_buffer(ctx, fb, BUFFER_FRONT_LEFT, BUFFER_BACK_LEFT);
-
- if (fb->Visual.stereoMode) {
- check_create_front_buffer(ctx, fb, BUFFER_FRONT_RIGHT, BUFFER_BACK_RIGHT);
- }
-
- st_invalidate_state(ctx, _NEW_BUFFERS);
-}
-
-