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 "main/framebuffer.h"
  47
  48
  49 /**
  50  * Update framebuffer size.
  51  *
  52  * We need to derive pipe_framebuffer size from the bound pipe_surfaces here
  53  * instead of copying gl_framebuffer size because for certain target types
  54  * (like PIPE_TEXTURE_1D_ARRAY) gl_framebuffer::Height has the number of layers
  55  * instead of 1.
  56  */
  57 static void
  58 update_framebuffer_size(struct pipe_framebuffer_state *framebuffer,
  59                         struct pipe_surface *surface)
  60 {
  61    assert(surface);
  62    assert(surface->width  < UINT_MAX);
  63    assert(surface->height < UINT_MAX);
  64    framebuffer->width  = MIN2(framebuffer->width,  surface->width);
  65    framebuffer->height = MIN2(framebuffer->height, surface->height);
  66 }
  67
  68 /**
  69  * Round up the requested multisample count to the next supported sample size.
  70  */
  71 static unsigned
  72 framebuffer_quantize_num_samples(struct st_context *st, unsigned num_samples)
  73 {
  74    struct pipe_screen *screen = st->pipe->screen;
  75    int quantized_samples = 0;
  76    unsigned msaa_mode;
  77
  78    if (!num_samples)
  79       return 0;
  80
  81    /* Assumes the highest supported MSAA is a power of 2 */
  82    msaa_mode = util_next_power_of_two(st->ctx->Const.MaxFramebufferSamples);
  83    assert(!(num_samples > msaa_mode)); /* be safe from infinite loops */
  84
  85    /**
  86     * Check if the MSAA mode that is higher than the requested
  87     * num_samples is supported, and if so returning it.
  88     */
  89    for (; msaa_mode >= num_samples; msaa_mode = msaa_mode / 2) {
  90       /**
  91        * For ARB_framebuffer_no_attachment, A format of
  92        * PIPE_FORMAT_NONE implies what number of samples is
  93        * supported for a framebuffer with no attachment. Thus the
  94        * drivers callback must be adjusted for this.
  95        */
  96       if (screen->is_format_supported(screen, PIPE_FORMAT_NONE,
  97                                       PIPE_TEXTURE_2D, msaa_mode,
  98                                       PIPE_BIND_RENDER_TARGET))
  99          quantized_samples = msaa_mode;
 100    }
 101    return quantized_samples;
 102 }
 103
 104 /**
 105  * Update framebuffer state (color, depth, stencil, etc. buffers)
 106  */
 107 static void
 108 update_framebuffer_state( struct st_context *st )
 109 {
 110    struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
 111    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
 112    struct st_renderbuffer *strb;
 113    GLuint i;
 114
 115    st_flush_bitmap_cache(st);
 116
 117    st->state.fb_orientation = st_fb_orientation(fb);
 118
 119    /**
 120     * Quantize the derived default number of samples:
 121     *
 122     * A query to the driver of supported MSAA values the
 123     * hardware supports is done as to legalize the number
 124     * of application requested samples, NumSamples.
 125     * See commit eb9cf3c for more information.
 126     */
 127    fb->DefaultGeometry._NumSamples =
 128       framebuffer_quantize_num_samples(st, fb->DefaultGeometry.NumSamples);
 129
 130    framebuffer->width  = _mesa_geometric_width(fb);
 131    framebuffer->height = _mesa_geometric_height(fb);
 132    framebuffer->samples = _mesa_geometric_samples(fb);
 133    framebuffer->layers = _mesa_geometric_layers(fb);
 134
 135    /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
 136     * to determine which surfaces to draw to
 137     */
 138    framebuffer->nr_cbufs = fb->_NumColorDrawBuffers;
 139
 140    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 141       pipe_surface_reference(&framebuffer->cbufs[i], NULL);
 142
 143       strb = st_renderbuffer(fb->_ColorDrawBuffers[i]);
 144
 145       if (strb) {
 146          if (strb->is_rtt || (strb->texture &&
 147              _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB)) {
 148             /* rendering to a GL texture, may have to update surface */
 149             st_update_renderbuffer_surface(st, strb);
 150          }
 151
 152          if (strb->surface) {
 153             pipe_surface_reference(&framebuffer->cbufs[i], strb->surface);
 154             update_framebuffer_size(framebuffer, strb->surface);
 155          }
 156          strb->defined = GL_TRUE; /* we'll be drawing something */
 157       }
 158    }
 159
 160    for (i = framebuffer->nr_cbufs; i < PIPE_MAX_COLOR_BUFS; i++) {
 161       pipe_surface_reference(&framebuffer->cbufs[i], NULL);
 162    }
 163
 164    /* Remove trailing GL_NONE draw buffers. */
 165    while (framebuffer->nr_cbufs &&
 166           !framebuffer->cbufs[framebuffer->nr_cbufs-1]) {
 167       framebuffer->nr_cbufs--;
 168    }
 169
 170    /*
 171     * Depth/Stencil renderbuffer/surface.
 172     */
 173    strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
 174    if (strb) {
 175       if (strb->is_rtt) {
 176          /* rendering to a GL texture, may have to update surface */
 177          st_update_renderbuffer_surface(st, strb);
 178       }
 179       pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
 180       update_framebuffer_size(framebuffer, strb->surface);
 181    }
 182    else {
 183       strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
 184       if (strb) {
 185          if (strb->is_rtt) {
 186             /* rendering to a GL texture, may have to update surface */
 187             st_update_renderbuffer_surface(st, strb);
 188          }
 189          pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
 190          update_framebuffer_size(framebuffer, strb->surface);
 191       }
 192       else
 193          pipe_surface_reference(&framebuffer->zsbuf, NULL);
 194    }
 195
 196 #ifdef DEBUG
 197    /* Make sure the resource binding flags were set properly */
 198    for (i = 0; i < framebuffer->nr_cbufs; i++) {
 199       assert(!framebuffer->cbufs[i] ||
 200              framebuffer->cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
 201    }
 202    if (framebuffer->zsbuf) {
 203       assert(framebuffer->zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
 204    }
 205 #endif
 206
 207    if (framebuffer->width == UINT_MAX)
 208       framebuffer->width = 0;
 209    if (framebuffer->height == UINT_MAX)
 210       framebuffer->height = 0;
 211
 212    cso_set_framebuffer(st->cso_context, framebuffer);
 213 }
 214
 215
 216 const struct st_tracked_state st_update_framebuffer = {
 217    "st_update_framebuffer",                             /* name */
 218    {                                                    /* dirty */
 219       _NEW_BUFFERS,                                     /* mesa */
 220       ST_NEW_FRAMEBUFFER,                               /* st */
 221    },
 222    update_framebuffer_state                             /* update */
 223 };
 224