st_cb_get.c

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/**************************************************************************
 * 
 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
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 * "Software"), to deal in the Software without restriction, including
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 * 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.
 * 
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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#include "main/imports.h"
#include "main/context.h"

#include "pipe/p_defines.h"

#include "st_cb_fbo.h"
#include "st_cb_get.h"



static void
get_preferred_read_format_type(GLcontext *ctx, GLint *format, GLint *type)
{
   struct gl_framebuffer *fb = ctx->ReadBuffer;
   struct st_renderbuffer *strb = st_renderbuffer(fb->_ColorReadBuffer);

   /* defaults */
   *format = ctx->Const.ColorReadFormat;
   *type = ctx->Const.ColorReadType;

   if (strb) {
      /* XXX could add more cases here... */
      if (strb->format == PIPE_FORMAT_A8R8G8B8_UNORM) {
         *format = GL_BGRA;
         if (_mesa_little_endian())
            *type = GL_UNSIGNED_INT_8_8_8_8_REV;
         else
            *type = GL_UNSIGNED_INT_8_8_8_8;
      }
   }
}


static GLboolean 
st_GetIntegerv(GLcontext *ctx, GLenum pname, GLint *params)
{
   GLint dummy;

   switch (pname) {
   case GL_IMPLEMENTATION_COLOR_READ_TYPE_OES:
      get_preferred_read_format_type(ctx, &dummy, params);
      return GL_TRUE;
   case GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES:
      get_preferred_read_format_type(ctx, params, &dummy);
      return GL_TRUE;
   default:
      return GL_FALSE;
   }
}


void st_init_get_functions(struct dd_function_table *functions)
{
   functions->GetIntegerv = st_GetIntegerv;
}

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