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      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 (at) 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    st_invalidate_readpix_cache(st);
    117 
    118    st->state.fb_orientation = st_fb_orientation(fb);
    119 
    120    /**
    121     * Quantize the derived default number of samples:
    122     *
    123     * A query to the driver of supported MSAA values the
    124     * hardware supports is done as to legalize the number
    125     * of application requested samples, NumSamples.
    126     * See commit eb9cf3c for more information.
    127     */
    128    fb->DefaultGeometry._NumSamples =
    129       framebuffer_quantize_num_samples(st, fb->DefaultGeometry.NumSamples);
    130 
    131    framebuffer->width  = _mesa_geometric_width(fb);
    132    framebuffer->height = _mesa_geometric_height(fb);
    133    framebuffer->samples = _mesa_geometric_samples(fb);
    134    framebuffer->layers = _mesa_geometric_layers(fb);
    135 
    136    /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
    137     * to determine which surfaces to draw to
    138     */
    139    framebuffer->nr_cbufs = fb->_NumColorDrawBuffers;
    140 
    141    for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
    142       pipe_surface_reference(&framebuffer->cbufs[i], NULL);
    143 
    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             pipe_surface_reference(&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       pipe_surface_reference(&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       if (strb->is_rtt) {
    177          /* rendering to a GL texture, may have to update surface */
    178          st_update_renderbuffer_surface(st, strb);
    179       }
    180       pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
    181       update_framebuffer_size(framebuffer, strb->surface);
    182    }
    183    else {
    184       strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
    185       if (strb) {
    186          if (strb->is_rtt) {
    187             /* rendering to a GL texture, may have to update surface */
    188             st_update_renderbuffer_surface(st, strb);
    189          }
    190          pipe_surface_reference(&framebuffer->zsbuf, strb->surface);
    191          update_framebuffer_size(framebuffer, strb->surface);
    192       }
    193       else
    194          pipe_surface_reference(&framebuffer->zsbuf, NULL);
    195    }
    196 
    197 #ifdef DEBUG
    198    /* Make sure the resource binding flags were set properly */
    199    for (i = 0; i < framebuffer->nr_cbufs; i++) {
    200       assert(!framebuffer->cbufs[i] ||
    201              framebuffer->cbufs[i]->texture->bind & PIPE_BIND_RENDER_TARGET);
    202    }
    203    if (framebuffer->zsbuf) {
    204       assert(framebuffer->zsbuf->texture->bind & PIPE_BIND_DEPTH_STENCIL);
    205    }
    206 #endif
    207 
    208    if (framebuffer->width == UINT_MAX)
    209       framebuffer->width = 0;
    210    if (framebuffer->height == UINT_MAX)
    211       framebuffer->height = 0;
    212 
    213    cso_set_framebuffer(st->cso_context, framebuffer);
    214 }
    215 
    216 
    217 const struct st_tracked_state st_update_framebuffer = {
    218    update_framebuffer_state				/* update */
    219 };
    220 
    221