pixel.c

winNT技术操作系统,国外开放的原代码和LIUX一样

   pixelmap(ctx, map, mapsize, values);

   if (ctx->Unpack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                              ctx->Unpack.BufferObj);
   }
}



void GLAPIENTRY
_mesa_PixelMapuiv(GLenum map, GLsizei mapsize, const GLuint *values )
{
   GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
      return;
   }

   if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
      /* test that mapsize is a power of two */
      if (_mesa_bitcount((GLuint) mapsize) != 1) {
	 _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
         return;
      }
   }

   FLUSH_VERTICES(ctx, _NEW_PIXEL);

   if (ctx->Unpack.BufferObj->Name) {
      /* unpack pixelmap from PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Unpack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Unpack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_INT, values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapuiv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                                              GL_READ_ONLY_ARB,
                                              ctx->Unpack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapuiv(PBO is mapped)");
         return;
      }
      values = (const GLuint *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   /* convert to floats */
   if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = (GLfloat) values[i];
      }
   }
   else {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = UINT_TO_FLOAT( values[i] );
      }
   }

   if (ctx->Unpack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                              ctx->Unpack.BufferObj);
   }

   pixelmap(ctx, map, mapsize, fvalues);
}



void GLAPIENTRY
_mesa_PixelMapusv(GLenum map, GLsizei mapsize, const GLushort *values )
{
   GLfloat fvalues[MAX_PIXEL_MAP_TABLE];
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (mapsize < 1 || mapsize > MAX_PIXEL_MAP_TABLE) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapusv(mapsize)" );
      return;
   }

   if (map >= GL_PIXEL_MAP_S_TO_S && map <= GL_PIXEL_MAP_I_TO_A) {
      /* test that mapsize is a power of two */
      if (_mesa_bitcount((GLuint) mapsize) != 1) {
	 _mesa_error( ctx, GL_INVALID_VALUE, "glPixelMapuiv(mapsize)" );
         return;
      }
   }

   FLUSH_VERTICES(ctx, _NEW_PIXEL);

   if (ctx->Unpack.BufferObj->Name) {
      /* unpack pixelmap from PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Unpack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Unpack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_SHORT,
                                     values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapusv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                                              GL_READ_ONLY_ARB,
                                              ctx->Unpack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glPixelMapusv(PBO is mapped)");
         return;
      }
      values = (const GLushort *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

    /* convert to floats */
   if (map == GL_PIXEL_MAP_I_TO_I || map == GL_PIXEL_MAP_S_TO_S) {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = (GLfloat) values[i];
      }
   }
   else {
      GLint i;
      for (i = 0; i < mapsize; i++) {
         fvalues[i] = USHORT_TO_FLOAT( values[i] );
      }
   }

   if (ctx->Unpack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
                              ctx->Unpack.BufferObj);
   }

   pixelmap(ctx, map, mapsize, fvalues);
}


/**
 * Return size of the named map.
 */
static GLuint
get_map_size(GLcontext *ctx, GLenum map)
{
   switch (map) {
      case GL_PIXEL_MAP_I_TO_I:
         return ctx->Pixel.MapItoIsize;
      case GL_PIXEL_MAP_S_TO_S:
         return ctx->Pixel.MapStoSsize;
      case GL_PIXEL_MAP_I_TO_R:
         return ctx->Pixel.MapItoRsize;
      case GL_PIXEL_MAP_I_TO_G:
         return ctx->Pixel.MapItoGsize;
      case GL_PIXEL_MAP_I_TO_B:
         return ctx->Pixel.MapItoBsize;
      case GL_PIXEL_MAP_I_TO_A:
         return ctx->Pixel.MapItoAsize;
      case GL_PIXEL_MAP_R_TO_R:
         return ctx->Pixel.MapRtoRsize;
      case GL_PIXEL_MAP_G_TO_G:
         return ctx->Pixel.MapGtoGsize;
      case GL_PIXEL_MAP_B_TO_B:
         return ctx->Pixel.MapBtoBsize;
      case GL_PIXEL_MAP_A_TO_A:
         return ctx->Pixel.MapAtoAsize;
      default:
         return 0;
   }
}


void GLAPIENTRY
_mesa_GetPixelMapfv( GLenum map, GLfloat *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLuint mapsize, i;
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   mapsize = get_map_size(ctx, map);

   if (ctx->Pack.BufferObj->Name) {
      /* pack pixelmap into PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Pack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Pack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_FLOAT, values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapfv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                                              GL_WRITE_ONLY_ARB,
                                              ctx->Pack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapfv(PBO is mapped)");
         return;
      }
      values = (GLfloat *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   switch (map) {
      case GL_PIXEL_MAP_I_TO_I:
         MEMCPY(values, ctx->Pixel.MapItoI, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_S_TO_S:
         for (i = 0; i < mapsize; i++) {
	    values[i] = (GLfloat) ctx->Pixel.MapStoS[i];
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_R:
         MEMCPY(values, ctx->Pixel.MapItoR, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_I_TO_G:
         MEMCPY(values, ctx->Pixel.MapItoG, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_I_TO_B:
         MEMCPY(values, ctx->Pixel.MapItoB, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_I_TO_A:
         MEMCPY(values, ctx->Pixel.MapItoA, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_R_TO_R:
         MEMCPY(values, ctx->Pixel.MapRtoR, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_G_TO_G:
         MEMCPY(values, ctx->Pixel.MapGtoG, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_B_TO_B:
         MEMCPY(values, ctx->Pixel.MapBtoB, mapsize * sizeof(GLfloat));
	 break;
      case GL_PIXEL_MAP_A_TO_A:
         MEMCPY(values, ctx->Pixel.MapAtoA, mapsize * sizeof(GLfloat));
	 break;
      default:
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
   }

   if (ctx->Pack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                              ctx->Pack.BufferObj);
   }
}


void GLAPIENTRY
_mesa_GetPixelMapuiv( GLenum map, GLuint *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint mapsize, i;
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   mapsize = get_map_size(ctx, map);

   if (ctx->Pack.BufferObj->Name) {
      /* pack pixelmap into PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Pack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Pack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_INT, values)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapuiv(invalid PBO access)");
         return;
      }
      /* restore */
      ctx->DefaultPacking.BufferObj = ctx->Array.NullBufferObj;
      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                                              GL_WRITE_ONLY_ARB,
                                              ctx->Pack.BufferObj);
      if (!buf) {
         /* buffer is already mapped - that's an error */
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glGetPixelMapuiv(PBO is mapped)");
         return;
      }
      values = (GLuint *) ADD_POINTERS(buf, values);
   }
   else if (!values) {
      return;
   }

   switch (map) {
      case GL_PIXEL_MAP_I_TO_I:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoI[i] );
	 }
	 break;
      case GL_PIXEL_MAP_S_TO_S:
         MEMCPY(values, ctx->Pixel.MapStoS, mapsize * sizeof(GLint));
	 break;
      case GL_PIXEL_MAP_I_TO_R:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoR[i] );
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_G:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoG[i] );
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_B:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoB[i] );
	 }
	 break;
      case GL_PIXEL_MAP_I_TO_A:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoA[i] );
	 }
	 break;
      case GL_PIXEL_MAP_R_TO_R:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapRtoR[i] );
	 }
	 break;
      case GL_PIXEL_MAP_G_TO_G:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapGtoG[i] );
	 }
	 break;
      case GL_PIXEL_MAP_B_TO_B:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapBtoB[i] );
	 }
	 break;
      case GL_PIXEL_MAP_A_TO_A:
	 for (i = 0; i < mapsize; i++) {
	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapAtoA[i] );
	 }
	 break;
      default:
         _mesa_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
   }

   if (ctx->Pack.BufferObj->Name) {
      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
                              ctx->Pack.BufferObj);
   }
}


void GLAPIENTRY
_mesa_GetPixelMapusv( GLenum map, GLushort *values )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint mapsize, i;
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   mapsize = get_map_size(ctx, map);

   if (ctx->Pack.BufferObj->Name) {
      /* pack pixelmap into PBO */
      GLubyte *buf;
      /* Note, need to use DefaultPacking and Pack's buffer object */
      ctx->DefaultPacking.BufferObj = ctx->Pack.BufferObj;
      if (!_mesa_validate_pbo_access(1, &ctx->DefaultPacking, mapsize, 1, 1,
                                     GL_INTENSITY, GL_UNSIGNED_SHORT,