src/mesa/state_tracker/st_framebuffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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 #include "main/imports.h"
  30 #include "main/context.h"
  31 #include "main/framebuffer.h"
  32 #include "main/renderbuffer.h"
  33 #include "st_public.h"
  34 #include "st_context.h"
  35 #include "st_cb_fbo.h"
  36
  37
  38 struct st_framebuffer *st_create_framebuffer( const __GLcontextModes *visual,
  39                                               boolean createRenderbuffers,
  40                                               void *private)
  41 {
  42    struct st_framebuffer *stfb
  43       = CALLOC_STRUCT(st_framebuffer);
  44    if (stfb) {
  45       GLenum rgbFormat = (visual->redBits == 5 ? GL_RGB5 : GL_RGBA8);
  46
  47       _mesa_initialize_framebuffer(&stfb->Base, visual);
  48
  49       if (createRenderbuffers) {
  50          {
  51             /* fake frontbuffer */
  52             /* XXX allocation should only happen in the unusual case
  53                it's actually needed */
  54             struct gl_renderbuffer *rb = st_new_renderbuffer_fb(rgbFormat);
  55             _mesa_add_renderbuffer(&stfb->Base, BUFFER_FRONT_LEFT, rb);
  56          }
  57
  58          if (visual->doubleBufferMode) {
  59             struct gl_renderbuffer *rb = st_new_renderbuffer_fb(rgbFormat);
  60             _mesa_add_renderbuffer(&stfb->Base, BUFFER_BACK_LEFT, rb);
  61          }
  62
  63          if (visual->depthBits == 24 && visual->stencilBits == 8) {
  64             /* combined depth/stencil buffer */
  65             struct gl_renderbuffer *depthStencilRb
  66                = st_new_renderbuffer_fb(GL_DEPTH24_STENCIL8_EXT);
  67             /* note: bind RB to two attachment points */
  68             _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, depthStencilRb);
  69             _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, depthStencilRb);
  70          }
  71          else {
  72             /* separate depth and/or stencil */
  73
  74             if (visual->depthBits == 32) {
  75                /* 32-bit depth buffer */
  76                struct gl_renderbuffer *depthRb
  77                   = st_new_renderbuffer_fb(GL_DEPTH_COMPONENT32);
  78                _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, depthRb);
  79             }
  80             else if (visual->depthBits == 24) {
  81                /* 24-bit depth buffer, ignore stencil bits */
  82                struct gl_renderbuffer *depthRb
  83                   = st_new_renderbuffer_fb(GL_DEPTH24_STENCIL8_EXT);
  84                _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, depthRb);
  85             }
  86             else if (visual->depthBits > 0) {
  87                /* 16-bit depth buffer */
  88                struct gl_renderbuffer *depthRb
  89                   = st_new_renderbuffer_fb(GL_DEPTH_COMPONENT16);
  90                _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, depthRb);
  91             }
  92
  93             if (visual->stencilBits > 0) {
  94                /* 8-bit stencil */
  95                struct gl_renderbuffer *stencilRb
  96                   = st_new_renderbuffer_fb(GL_STENCIL_INDEX8_EXT);
  97                _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, stencilRb);
  98             }
  99          }
 100
 101 #if 0
 102          if (visual->accumRedBits > 0) {
 103             /* 16-bit/channel accum */
 104             struct gl_renderbuffer *accumRb
 105                = st_new_renderbuffer_fb(GL_RGBA16);
 106             _mesa_add_renderbuffer(&stfb->Base, BUFFER_ACCUM, accumRb);
 107          }
 108 #endif
 109
 110          /* now add any/all software-based renderbuffers we may need */
 111          _mesa_add_soft_renderbuffers(&stfb->Base,
 112                                       GL_FALSE, /* never sw color */
 113                                       GL_FALSE, /* never sw depth */
 114                                       GL_FALSE, /* stencil */
 115                                       visual->accumRedBits > 0,
 116                                       GL_FALSE, /* never sw alpha */
 117                                       GL_FALSE  /* never sw aux */ );
 118       }
 119
 120       stfb->Base.Initialized = GL_TRUE;
 121
 122       stfb->Private = private;
 123    }
 124    return stfb;
 125 }
 126
 127
 128 void st_resize_framebuffer( struct st_framebuffer *stfb,
 129                             uint width, uint height )
 130 {
 131    if (stfb->Base.Width != width || stfb->Base.Height != height) {
 132       GET_CURRENT_CONTEXT(ctx);
 133       if (ctx) {
 134          _mesa_resize_framebuffer(ctx, &stfb->Base, width, height);
 135
 136          assert(stfb->Base.Width == width);
 137          assert(stfb->Base.Height == height);
 138       }
 139    }
 140 }
 141
 142
 143 void st_unreference_framebuffer( struct st_framebuffer **stfb )
 144 {
 145    _mesa_unreference_framebuffer((struct gl_framebuffer **) stfb);
 146 }
 147
 148
 149
 150 /**
 151  * Return the pipe_surface for the given renderbuffer.
 152  */
 153 struct pipe_surface *
 154 st_get_framebuffer_surface(struct st_framebuffer *stfb, uint surfIndex)
 155 {
 156    struct st_renderbuffer *strb;
 157
 158    assert(surfIndex <= ST_SURFACE_DEPTH);
 159
 160    /* sanity checks, ST tokens should match Mesa tokens */
 161    assert(ST_SURFACE_FRONT_LEFT == BUFFER_FRONT_LEFT);
 162    assert(ST_SURFACE_BACK_RIGHT == BUFFER_BACK_RIGHT);
 163
 164    strb = st_renderbuffer(stfb->Base.Attachment[surfIndex].Renderbuffer);
 165    if (strb)
 166       return strb->surface;
 167    return NULL;
 168 }
 169
 170
 171 /**
 172  * This function is to be called prior to SwapBuffers on the given
 173  * framebuffer.  It checks if the current context is bound to the framebuffer
 174  * and flushes rendering if needed.
 175  */
 176 void
 177 st_notify_swapbuffers(struct st_framebuffer *stfb)
 178 {
 179    GET_CURRENT_CONTEXT(ctx);
 180
 181    if (ctx && ctx->DrawBuffer == &stfb->Base) {
 182       st_flush(ctx->st, 0x0);
 183    }
 184 }
 185
 186
 187 void *st_framebuffer_private( struct st_framebuffer *stfb )
 188 {
 189    return stfb->Private;
 190 }
 191