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/**************************************************************************
*
* Copyright 2007 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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keithw@vmware.com>
* Brian Paul
*/
#include <limits.h>
#include "st_context.h"
#include "st_atom.h"
#include "st_cb_bitmap.h"
#include "st_cb_fbo.h"
#include "st_texture.h"
#include "pipe/p_context.h"
#include "cso_cache/cso_context.h"
#include "util/u_math.h"
#include "util/u_inlines.h"
#include "util/u_format.h"
#include "util/u_framebuffer.h"
#include "main/framebuffer.h"
/**
* Update framebuffer size.
*
* We need to derive pipe_framebuffer size from the bound pipe_surfaces here
* instead of copying gl_framebuffer size because for certain target types
* (like PIPE_TEXTURE_1D_ARRAY) gl_framebuffer::Height has the number of layers
* instead of 1.
*/
static void
update_framebuffer_size(struct pipe_framebuffer_state *framebuffer,
struct pipe_surface *surface)
{
assert(surface);
assert(surface->width < USHRT_MAX);
assert(surface->height < USHRT_MAX);
framebuffer->width = MIN2(framebuffer->width, surface->width);
framebuffer->height = MIN2(framebuffer->height, surface->height);
}
/**
* Round up the requested multisample count to the next supported sample size.
*/
static unsigned
framebuffer_quantize_num_samples(struct st_context *st, unsigned num_samples)
{
struct pipe_screen *screen = st->pipe->screen;
int quantized_samples = 0;
unsigned msaa_mode;
if (!num_samples)
return 0;
/* Assumes the highest supported MSAA is a power of 2 */
msaa_mode = util_next_power_of_two(st->ctx->Const.MaxFramebufferSamples);
assert(!(num_samples > msaa_mode)); /* be safe from infinite loops */
/**
* Check if the MSAA mode that is higher than the requested
* num_samples is supported, and if so returning it.
*/
for (; msaa_mode >= num_samples; msaa_mode = msaa_mode / 2) {
/**
* For ARB_framebuffer_no_attachment, A format of
* PIPE_FORMAT_NONE implies what number of samples is
* supported for a framebuffer with no attachment. Thus the
* drivers callback must be adjusted for this.
*/
if (screen->is_format_supported(screen, PIPE_FORMAT_NONE,
PIPE_TEXTURE_2D, msaa_mode,
PIPE_BIND_RENDER_TARGET))
quantized_samples = msaa_mode;
}
return quantized_samples;
}
/**
* Update framebuffer state (color, depth, stencil, etc. buffers)
*/
void
st_update_framebuffer_state( struct st_context *st )
{
struct pipe_framebuffer_state framebuffer;
struct gl_framebuffer *fb = st->ctx->DrawBuffer;
struct st_renderbuffer *strb;
GLuint i;
st_flush_bitmap_cache(st);
st_invalidate_readpix_cache(st);
st->state.fb_orientation = st_fb_orientation(fb);
/**
* Quantize the derived default number of samples:
*
* A query to the driver of supported MSAA values the
* hardware supports is done as to legalize the number
* of application requested samples, NumSamples.
* See commit eb9cf3c for more information.
*/
fb->DefaultGeometry._NumSamples =
framebuffer_quantize_num_samples(st, fb->DefaultGeometry.NumSamples);
framebuffer.width = _mesa_geometric_width(fb);
framebuffer.height = _mesa_geometric_height(fb);
framebuffer.samples = _mesa_geometric_samples(fb);
framebuffer.layers = _mesa_geometric_layers(fb);
/* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
* to determine which surfaces to draw to
*/
framebuffer.nr_cbufs = fb->_NumColorDrawBuffers;
for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
framebuffer.cbufs[i] = NULL;
strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
if (strb) {
if (strb->is_rtt || (strb->texture &&
_mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB)) {
/* rendering to a GL texture, may have to update surface */
st_update_renderbuffer_surface(st, strb);
}
if (strb->surface) {
framebuffer.cbufs[i] = strb->surface;
update_framebuffer_size(&framebuffer, strb->surface);
}
strb->defined = GL_TRUE; /* we'll be drawing something */
}
}
for (i = framebuffer.nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
framebuffer.cbufs[i] = NULL;
}
/* Remove trailing GL_NONE draw buffers. */
while (framebuffer.nr_cbufs &&
!framebuffer.cbufs[framebuffer.nr_cbufs-1]) {
framebuffer.nr_cbufs--;
}
/*
* Depth/Stencil renderbuffer/surface.
*/
strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
if (strb) {
if (strb->is_rtt) {
/* rendering to a GL texture, may have to update surface */
st_update_renderbuffer_surface(st, strb);
}
framebuffer.zsbuf = strb->surface;
update_framebuffer_size(&framebuffer, strb->surface);
}
else {
strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
if (strb) {
if (strb->is_rtt) {
/* rendering to a GL texture, may have to update surface */
st_update_renderbuffer_surface(st, strb);
}
framebuffer.zsbuf = strb->surface;
update_framebuffer_size(&framebuffer, strb->surface);
}
else
framebuffer.zsbuf = NULL;
}
#ifdef DEBUG
/* Make sure the resource binding flags were set properly */
for (i = 0; i < framebuffer.nr_cbufs; i++) {
assert(!framebuffer.cbufs[i] ||
framebuffer.cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
}
if (framebuffer.zsbuf) {
assert(framebuffer.zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
}
#endif
if (framebuffer.width == USHRT_MAX)
framebuffer.width = 0;
if (framebuffer.height == USHRT_MAX)
framebuffer.height = 0;
cso_set_framebuffer(st->cso_context, &framebuffer);
st->state.fb_width = framebuffer.width;
st->state.fb_height = framebuffer.height;
st->state.fb_num_samples = util_framebuffer_get_num_samples(&framebuffer);
st->state.fb_num_layers = util_framebuffer_get_num_layers(&framebuffer);
}
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