src/mesa/state_tracker/st_atom_framebuffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keithw@vmware.com>
  31   *   Brian Paul
  32   */
  33
  34 #include <limits.h>
  35
  36 #include "st_context.h"
  37 #include "st_atom.h"
  38 #include "st_cb_bitmap.h"
  39 #include "st_cb_fbo.h"
  40 #include "st_texture.h"
  41 #include "pipe/p_context.h"
  42 #include "cso_cache/cso_context.h"
  43 #include "util/u_math.h"
  44 #include "util/u_inlines.h"
  45 #include "util/u_format.h"
  46 #include "util/u_framebuffer.h"
  47 #include "main/framebuffer.h"
  48
  49
  50 /**
  51  * Update framebuffer size.
  52  *
  53  * We need to derive pipe_framebuffer size from the bound pipe_surfaces here
  54  * instead of copying gl_framebuffer size because for certain target types
  55  * (like PIPE_TEXTURE_1D_ARRAY) gl_framebuffer::Height has the number of layers
  56  * instead of 1.
  57  */
  58 static void
  59 update_framebuffer_size(struct pipe_framebuffer_state *framebuffer,
  60                         struct pipe_surface *surface)
  61 {
  62    assert(surface);
  63    assert(surface->width  < USHRT_MAX);
  64    assert(surface->height < USHRT_MAX);
  65    framebuffer->width  = MIN2(framebuffer->width,  surface->width);
  66    framebuffer->height = MIN2(framebuffer->height, surface->height);
  67 }
  68
  69 /**
  70  * Round up the requested multisample count to the next supported sample size.
  71  */
  72 static unsigned
  73 framebuffer_quantize_num_samples(struct st_context *st, unsigned num_samples)
  74 {
  75    struct pipe_screen *screen = st->pipe->screen;
  76    int quantized_samples = 0;
  77    unsigned msaa_mode;
  78
  79    if (!num_samples)
  80       return 0;
  81
  82    /* Assumes the highest supported MSAA is a power of 2 */
  83    msaa_mode = util_next_power_of_two(st->ctx->Const.MaxFramebufferSamples);
  84    assert(!(num_samples > msaa_mode)); /* be safe from infinite loops */
  85
  86    /**
  87     * Check if the MSAA mode that is higher than the requested
  88     * num_samples is supported, and if so returning it.
  89     */
  90    for (; msaa_mode >= num_samples; msaa_mode = msaa_mode / 2) {
  91       /**
  92        * For ARB_framebuffer_no_attachment, A format of
  93        * PIPE_FORMAT_NONE implies what number of samples is
  94        * supported for a framebuffer with no attachment. Thus the
  95        * drivers callback must be adjusted for this.
  96        */
  97       if (screen->is_format_supported(screen, PIPE_FORMAT_NONE,
  98                                       PIPE_TEXTURE_2D, msaa_mode, msaa_mode,
  99                                       PIPE_BIND_RENDER_TARGET))
 100          quantized_samples = msaa_mode;
 101    }
 102    return quantized_samples;
 103 }
 104
 105 /**
 106  * Update framebuffer state (color, depth, stencil, etc. buffers)
 107  */
 108 void
 109 st_update_framebuffer_state( struct st_context *st )
 110 {
 111    struct pipe_framebuffer_state framebuffer;
 112    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 113    struct st_renderbuffer *strb;
 114    GLuint i;
 115
 116    st_flush_bitmap_cache(st);
 117    st_invalidate_readpix_cache(st);
 118
 119    st->state.fb_orientation = st_fb_orientation(fb);
 120
 121    /**
 122     * Quantize the derived default number of samples:
 123     *
 124     * A query to the driver of supported MSAA values the
 125     * hardware supports is done as to legalize the number
 126     * of application requested samples, NumSamples.
 127     * See commit eb9cf3c for more information.
 128     */
 129    fb->DefaultGeometry._NumSamples =
 130       framebuffer_quantize_num_samples(st, fb->DefaultGeometry.NumSamples);
 131
 132    framebuffer.width  = _mesa_geometric_width(fb);
 133    framebuffer.height = _mesa_geometric_height(fb);
 134    framebuffer.samples = _mesa_geometric_samples(fb);
 135    framebuffer.layers = _mesa_geometric_layers(fb);
 136
 137    /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
 138     * to determine which surfaces to draw to
 139     */
 140    framebuffer.nr_cbufs = fb->_NumColorDrawBuffers;
 141
 142    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 143       framebuffer.cbufs[i] = NULL;
 144       strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
 145
 146       if (strb) {
 147          if (strb->is_rtt || (strb->texture &&
 148              _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB)) {
 149             /* rendering to a GL texture, may have to update surface */
 150             st_update_renderbuffer_surface(st, strb);
 151          }
 152
 153          if (strb->surface) {
 154             framebuffer.cbufs[i] = strb->surface;
 155             update_framebuffer_size(&framebuffer, strb->surface);
 156          }
 157          strb->defined = GL_TRUE; /* we'll be drawing something */
 158       }
 159    }
 160
 161    for (i = framebuffer.nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
 162       framebuffer.cbufs[i] = NULL;
 163    }
 164
 165    /* Remove trailing GL_NONE draw buffers. */
 166    while (framebuffer.nr_cbufs &&
 167           !framebuffer.cbufs[framebuffer.nr_cbufs-1]) {
 168       framebuffer.nr_cbufs--;
 169    }
 170
 171    /*
 172     * Depth/Stencil renderbuffer/surface.
 173     */
 174    strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
 175    if (!strb)
 176       strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
 177
 178    if (strb) {
 179       if (strb->is_rtt) {
 180          /* rendering to a GL texture, may have to update surface */
 181          st_update_renderbuffer_surface(st, strb);
 182       }
 183       framebuffer.zsbuf = strb->surface;
 184       update_framebuffer_size(&framebuffer, strb->surface);
 185    }
 186    else
 187       framebuffer.zsbuf = NULL;
 188
 189 #ifdef DEBUG
 190    /* Make sure the resource binding flags were set properly */
 191    for (i = 0; i < framebuffer.nr_cbufs; i++) {
 192       assert(!framebuffer.cbufs[i] ||
 193              framebuffer.cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
 194    }
 195    if (framebuffer.zsbuf) {
 196       assert(framebuffer.zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
 197    }
 198 #endif
 199
 200    if (framebuffer.width == USHRT_MAX)
 201       framebuffer.width = 0;
 202    if (framebuffer.height == USHRT_MAX)
 203       framebuffer.height = 0;
 204
 205    cso_set_framebuffer(st->cso_context, &framebuffer);
 206
 207    st->state.fb_width = framebuffer.width;
 208    st->state.fb_height = framebuffer.height;
 209    st->state.fb_num_samples = util_framebuffer_get_num_samples(&framebuffer);
 210    st->state.fb_num_layers = util_framebuffer_get_num_layers(&framebuffer);
 211    st->state.fb_num_cb = framebuffer.nr_cbufs;
 212 }