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    struct st_context *st = ctx->st;
  73
  74    const uint pFilter = ((filter == GL_NEAREST)
  75                          ? PIPE_TEX_MIPFILTER_NEAREST
  76                          : PIPE_TEX_MIPFILTER_LINEAR);
  77
  78    if (!_mesa_clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1,
  79                         &dstX0, &dstY0, &dstX1, &dstY1)) {
  80       return; /* nothing to draw/blit */
  81    }
  82
  83    if (mask & GL_COLOR_BUFFER_BIT) {
  84       struct st_renderbuffer *srcRb =
  85          st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
  86       struct st_renderbuffer *dstRb =
  87          st_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0]);
  88       struct pipe_surface *srcSurf = srcRb->surface;
  89       struct pipe_surface *dstSurf = dstRb->surface;
  90
  91       if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
  92          /* invert Y for dest */
  93          dstY0 = dstRb->Base.Height - dstY0;
  94          dstY1 = dstRb->Base.Height - dstY1;
  95       }
  96
  97       if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
  98          /* invert Y for src */
  99          srcY0 = srcRb->Base.Height - srcY0;
 100          srcY1 = srcRb->Base.Height - srcY1;
 101       }
 102
 103       if (srcY0 > srcY1 && dstY0 > dstY1) {
 104          /* Both src and dst are upside down.  Swap Y to make it
 105           * right-side up to increase odds of using a fast path.
 106           * Recall that all Gallium raster coords have Y=0=top.
 107           */
 108          GLint tmp;
 109          tmp = srcY0;
 110          srcY0 = srcY1;
 111          srcY1 = tmp;
 112          tmp = dstY0;
 113          dstY0 = dstY1;
 114          dstY1 = tmp;
 115       }
 116
 117       util_blit_pixels(st->blit,
 118                        srcSurf, srcX0, srcY0, srcX1, srcY1,
 119                        dstSurf, dstX0, dstY0, dstX1, dstY1,
 120                        0.0, pFilter);
 121
 122    }
 123 }
 124
 125
 126
 127 void
 128 st_init_blit_functions(struct dd_function_table *functions)
 129 {
 130 #if FEATURE_EXT_framebuffer_blit
 131    functions->BlitFramebuffer = st_BlitFramebuffer;
 132 #endif
 133 }