src/mesa/state_tracker/st_cb_blit.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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   * Authors:
  30   *   Brian Paul
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/macros.h"
  36 #include "main/texformat.h"
  37 #include "shader/program.h"
  38 #include "shader/prog_parameter.h"
  39 #include "shader/prog_print.h"
  40
  41 #include "st_context.h"
  42 #include "st_program.h"
  43 #include "st_cb_blit.h"
  44 #include "st_cb_fbo.h"
  45
  46 #include "util/u_blit.h"
  47
  48 #include "cso_cache/cso_context.h"
  49
  50
  51 void
  52 st_init_blit(struct st_context *st)
  53 {
  54    st->blit = util_create_blit(st->pipe, st->cso_context);
  55 }
  56
  57
  58 void
  59 st_destroy_blit(struct st_context *st)
  60 {
  61    util_destroy_blit(st->blit);
  62    st->blit = NULL;
  63 }
  64
  65
  66 static void
  67 st_BlitFramebuffer(GLcontext *ctx,
  68                    GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
  69                    GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
  70                    GLbitfield mask, GLenum filter)
  71 {
  72    const GLbitfield depthStencil = (GL_DEPTH_BUFFER_BIT |
  73                                     GL_STENCIL_BUFFER_BIT);
  74    struct st_context *st = ctx->st;
  75    const uint pFilter = ((filter == GL_NEAREST)
  76                          ? PIPE_TEX_MIPFILTER_NEAREST
  77                          : PIPE_TEX_MIPFILTER_LINEAR);
  78    struct gl_framebuffer *readFB = ctx->ReadBuffer;
  79    struct gl_framebuffer *drawFB = ctx->DrawBuffer;
  80
  81    if (!_mesa_clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1,
  82                         &dstX0, &dstY0, &dstX1, &dstY1)) {
  83       return; /* nothing to draw/blit */
  84    }
  85
  86    if (st_fb_orientation(drawFB) == Y_0_TOP) {
  87       /* invert Y for dest */
  88       dstY0 = drawFB->Height - dstY0;
  89       dstY1 = drawFB->Height - dstY1;
  90    }
  91
  92    if (st_fb_orientation(readFB) == Y_0_TOP) {
  93       /* invert Y for src */
  94       srcY0 = readFB->Height - srcY0;
  95       srcY1 = readFB->Height - srcY1;
  96    }
  97
  98    if (srcY0 > srcY1 && dstY0 > dstY1) {
  99       /* Both src and dst are upside down.  Swap Y to make it
 100        * right-side up to increase odds of using a fast path.
 101        * Recall that all Gallium raster coords have Y=0=top.
 102        */
 103       GLint tmp;
 104       tmp = srcY0;
 105       srcY0 = srcY1;
 106       srcY1 = tmp;
 107       tmp = dstY0;
 108       dstY0 = dstY1;
 109       dstY1 = tmp;
 110    }
 111
 112    if (mask & GL_COLOR_BUFFER_BIT) {
 113       struct st_renderbuffer *srcRb =
 114          st_renderbuffer(readFB->_ColorReadBuffer);
 115       struct st_renderbuffer *dstRb =
 116          st_renderbuffer(drawFB->_ColorDrawBuffers[0]);
 117       struct pipe_surface *srcSurf = srcRb->surface;
 118       struct pipe_surface *dstSurf = dstRb->surface;
 119
 120       util_blit_pixels(st->blit,
 121                        srcSurf, srcX0, srcY0, srcX1, srcY1,
 122                        dstSurf, dstX0, dstY0, dstX1, dstY1,
 123                        0.0, pFilter);
 124    }
 125
 126    if (mask & depthStencil) {
 127       /* depth and/or stencil blit */
 128
 129       /* get src/dst depth surfaces */
 130       struct st_renderbuffer *srcDepthRb =
 131          st_renderbuffer(readFB->Attachment[BUFFER_DEPTH].Renderbuffer);
 132       struct st_renderbuffer *dstDepthRb =
 133          st_renderbuffer(drawFB->Attachment[BUFFER_DEPTH].Renderbuffer);
 134       struct pipe_surface *srcDepthSurf =
 135          srcDepthRb ? srcDepthRb->surface : NULL;
 136       struct pipe_surface *dstDepthSurf =
 137          dstDepthRb ? dstDepthRb->surface : NULL;
 138
 139       /* get src/dst stencil surfaces */
 140       struct st_renderbuffer *srcStencilRb =
 141          st_renderbuffer(readFB->Attachment[BUFFER_STENCIL].Renderbuffer);
 142       struct st_renderbuffer *dstStencilRb =
 143          st_renderbuffer(drawFB->Attachment[BUFFER_STENCIL].Renderbuffer);
 144       struct pipe_surface *srcStencilSurf =
 145          srcStencilRb ? srcStencilRb->surface : NULL;
 146       struct pipe_surface *dstStencilSurf =
 147          dstStencilRb ? dstStencilRb->surface : NULL;
 148
 149       if ((mask & depthStencil) == depthStencil &&
 150           srcDepthSurf == srcStencilSurf &&
 151           dstDepthSurf == dstStencilSurf) {
 152          /* Blitting depth and stencil values between combined
 153           * depth/stencil buffers.  This is the ideal case for such buffers.
 154           */
 155          util_blit_pixels(st->blit,
 156                           srcDepthSurf, srcX0, srcY0, srcX1, srcY1,
 157                           dstDepthSurf, dstX0, dstY0, dstX1, dstY1,
 158                           0.0, pFilter);
 159       }
 160       else {
 161          /* blitting depth and stencil separately */
 162
 163          if (mask & GL_DEPTH_BUFFER_BIT) {
 164             /* blit Z only */
 165             _mesa_problem(ctx, "st_BlitFramebuffer(DEPTH) not completed");
 166          }
 167
 168          if (mask & GL_STENCIL_BUFFER_BIT) {
 169             /* blit stencil only */
 170             _mesa_problem(ctx, "st_BlitFramebuffer(STENCIL) not completed");
 171          }
 172       }
 173    }
 174 }
 175
 176
 177
 178 void
 179 st_init_blit_functions(struct dd_function_table *functions)
 180 {
 181 #if FEATURE_EXT_framebuffer_blit
 182    functions->BlitFramebuffer = st_BlitFramebuffer;
 183 #endif
 184 }