st_cb_blit.c

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/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 **************************************************************************/

 /*
  * Authors:
  *   Brian Paul
  */

#include "main/imports.h"
#include "main/image.h"
#include "main/macros.h"
#include "main/texformat.h"
#include "shader/program.h"
#include "shader/prog_parameter.h"
#include "shader/prog_print.h"

#include "st_context.h"
#include "st_program.h"
#include "st_cb_blit.h"
#include "st_cb_fbo.h"

#include "util/u_blit.h"

#include "cso_cache/cso_context.h"


void
st_init_blit(struct st_context *st)
{
   st->blit = util_create_blit(st->pipe, st->cso_context);
}


void
st_destroy_blit(struct st_context *st)
{
   util_destroy_blit(st->blit);
   st->blit = NULL;
}


static void
st_BlitFramebuffer(GLcontext *ctx,
                   GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,
                   GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,
                   GLbitfield mask, GLenum filter)
{
   struct st_context *st = ctx->st;

   const uint pFilter = ((filter == GL_NEAREST)
                         ? PIPE_TEX_MIPFILTER_NEAREST
                         : PIPE_TEX_MIPFILTER_LINEAR);

   if (mask & GL_COLOR_BUFFER_BIT) {
      struct st_renderbuffer *srcRb = 
         st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
      struct st_renderbuffer *dstRb = 
         st_renderbuffer(ctx->DrawBuffer->_ColorDrawBuffers[0][0]);
      struct pipe_surface *srcSurf = srcRb->surface;
      struct pipe_surface *dstSurf = dstRb->surface;

      if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
         /* invert Y */
         srcY0 = srcRb->Base.Height - srcY0;
         srcY1 = srcRb->Base.Height - srcY1;

         dstY0 = dstRb->Base.Height - dstY0;
         dstY1 = dstRb->Base.Height - dstY1;
      }

      util_blit_pixels(st->blit,
                       srcSurf, srcX0, srcY0, srcX1, srcY1,
                       dstSurf, dstX0, dstY0, dstX1, dstY1,
                       0.0, pFilter);

   }
}



void
st_init_blit_functions(struct dd_function_table *functions)
{
#if FEATURE_EXT_framebuffer_blit
   functions->BlitFramebuffer = st_BlitFramebuffer;
#endif
}

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