/**************************************************************************
*
* Copyright 2009-2010 VMware, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
* Framebuffer utility functions.
*
* @author Brian Paul
*/
#include "pipe/p_screen.h"
#include "pipe/p_state.h"
#include "pipe/p_defines.h"
#include "util/u_inlines.h"
#include "util/u_memory.h"
#include "util/u_framebuffer.h"
/**
* Compare pipe_framebuffer_state objects.
* \return TRUE if same, FALSE if different
*/
boolean
util_framebuffer_state_equal(const struct pipe_framebuffer_state *dst,
const struct pipe_framebuffer_state *src)
{
unsigned i;
if (dst->width != src->width ||
dst->height != src->height)
return FALSE;
for (i = 0; i < Elements(src->cbufs); i++) {
if (dst->cbufs[i] != src->cbufs[i]) {
return FALSE;
}
}
if (dst->nr_cbufs != src->nr_cbufs) {
return FALSE;
}
if (dst->zsbuf != src->zsbuf) {
return FALSE;
}
return TRUE;
}
/**
* Copy framebuffer state from src to dst, updating refcounts.
*/
void
util_copy_framebuffer_state(struct pipe_framebuffer_state *dst,
const struct pipe_framebuffer_state *src)
{
unsigned i;
dst->width = src->width;
dst->height = src->height;
for (i = 0; i < src->nr_cbufs; i++)
pipe_surface_reference(&dst->cbufs[i], src->cbufs[i]);
/* Set remaining dest cbuf pointers to NULL */
for ( ; i < Elements(dst->cbufs); i++)
pipe_surface_reference(&dst->cbufs[i], NULL);
dst->nr_cbufs = src->nr_cbufs;
pipe_surface_reference(&dst->zsbuf, src->zsbuf);
}
void
util_unreference_framebuffer_state(struct pipe_framebuffer_state *fb)
{
unsigned i;
for (i = 0; i < fb->nr_cbufs; i++) {
pipe_surface_reference(&fb->cbufs[i], NULL);
}
pipe_surface_reference(&fb->zsbuf, NULL);
fb->width = fb->height = 0;
fb->nr_cbufs = 0;
}
/* Where multiple sizes are allowed for framebuffer surfaces, find the
* minimum width and height of all bound surfaces.
*/
boolean
util_framebuffer_min_size(const struct pipe_framebuffer_state *fb,
unsigned *width,
unsigned *height)
{
unsigned w = ~0;
unsigned h = ~0;
unsigned i;
for (i = 0; i < fb->nr_cbufs; i++) {
if (!fb->cbufs[i])
continue;
w = MIN2(w, fb->cbufs[i]->width);
h = MIN2(h, fb->cbufs[i]->height);
}
if (fb->zsbuf) {
w = MIN2(w, fb->zsbuf->width);
h = MIN2(h, fb->zsbuf->height);
}
if (w == ~0) {
*width = 0;
*height = 0;
return FALSE;
}
else {
*width = w;
*height = h;
return TRUE;
}
}
/**
* Return the number of layers set in the framebuffer state.
*/
unsigned
util_framebuffer_get_num_layers(const struct pipe_framebuffer_state *fb)
{
unsigned i, num_layers = 0;
for (i = 0; i < fb->nr_cbufs; i++) {
if (fb->cbufs[i]) {
unsigned num = fb->cbufs[i]->u.tex.last_layer -
fb->cbufs[i]->u.tex.first_layer + 1;
num_layers = MAX2(num_layers, num);
}
}
if (fb->zsbuf) {
unsigned num = fb->zsbuf->u.tex.last_layer -
fb->zsbuf->u.tex.first_layer + 1;
num_layers = MAX2(num_layers, num);
}
return num_layers;
}
/**
* Return the number of MSAA samples.
*/
unsigned
util_framebuffer_get_num_samples(const struct pipe_framebuffer_state *fb)
{
unsigned i;
for (i = 0; i < fb->nr_cbufs; i++) {
if (fb->cbufs[i]) {
return MAX2(1, fb->cbufs[i]->texture->nr_samples);
}
}
if (fb->zsbuf) {
return MAX2(1, fb->zsbuf->texture->nr_samples);
}
return 1;
}