teximage.c

winNT技术操作系统,国外开放的原代码和LIUX一样

               (target == GL_PROXY_TEXTURE_CUBE_MAP ||
                (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X &&
                 target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z))) {
         /* OK */
      }
      else {
         _mesa_error(ctx, GL_INVALID_ENUM,
                     "glTexSubImage%D(target)", dimensions);
         return GL_TRUE;
      }
      /* offset must be multiple of 4 */
      if ((xoffset & 3) || (yoffset & 3)) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glTexSubImage%D(xoffset or yoffset)", dimensions);
         return GL_TRUE;
      }
      /* size must be multiple of 4 or equal to whole texture size */
      if ((width & 3) && (GLuint) width != texImage->Width) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glTexSubImage%D(width)", dimensions);
         return GL_TRUE;
      }         
      if ((height & 3) && (GLuint) height != texImage->Height) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glTexSubImage%D(width)", dimensions);
         return GL_TRUE;
      }         
   }

   return GL_FALSE;
}


/**
 * Test glCopyTexImage[12]D() parameters for errors.
 * 
 * \param ctx GL context.
 * \param dimensions texture image dimensions (must be 1, 2 or 3).
 * \param target texture target given by the user.
 * \param level image level given by the user.
 * \param internalFormat internal format given by the user.
 * \param width image width given by the user.
 * \param height image height given by the user.
 * \param depth image depth given by the user.
 * \param border texture border.
 * 
 * \return GL_TRUE if an error was detected, or GL_FALSE if no errors.
 * 
 * Verifies each of the parameters against the constants specified in
 * __GLcontextRec::Const and the supported extensions, and according to the
 * OpenGL specification.
 */
static GLboolean
copytexture_error_check( GLcontext *ctx, GLuint dimensions,
                         GLenum target, GLint level, GLint internalFormat,
                         GLint width, GLint height, GLint border )
{
   GLenum format, type;
   GLboolean sizeOK;

   /* Basic level check (more checking in ctx->Driver.TestProxyTexImage) */
   if (level < 0 || level >= MAX_TEXTURE_LEVELS) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glCopyTexImage%dD(level=%d)", dimensions, level);
      return GL_TRUE;
   }

   /* Check border */
   if (border < 0 || border > 1 ||
       ((target == GL_TEXTURE_RECTANGLE_NV ||
         target == GL_PROXY_TEXTURE_RECTANGLE_NV) && border != 0)) {
      return GL_TRUE;
   }

   /* The format and type aren't really significant here, but we need to pass
    * something to TestProxyTexImage().
    */
   format = _mesa_base_tex_format(ctx, internalFormat);
   type = GL_FLOAT;

   /* Check target and call ctx->Driver.TestProxyTexImage() to check the
    * level, width, height and depth.
    */
   if (dimensions == 1) {
      if (target == GL_TEXTURE_1D) {
         sizeOK = ctx->Driver.TestProxyTexImage(ctx, GL_PROXY_TEXTURE_1D,
                                                level, internalFormat,
                                                format, type,
                                                width, 1, 1, border);
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexImage1D(target)" );
         return GL_TRUE;
      }
   }
   else if (dimensions == 2) {
      if (target == GL_TEXTURE_2D) {
         sizeOK = ctx->Driver.TestProxyTexImage(ctx, GL_PROXY_TEXTURE_2D,
                                                level, internalFormat,
                                                format, type,
                                                width, height, 1, border);
      }
      else if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB &&
               target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB) {
         if (!ctx->Extensions.ARB_texture_cube_map) {
            _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexImage2D(target)" );
            return GL_TRUE;
         }
         sizeOK = (width == height) &&
            ctx->Driver.TestProxyTexImage(ctx, GL_PROXY_TEXTURE_CUBE_MAP_ARB,
                                          level, internalFormat, format, type,
                                          width, height, 1, border);
      }
      else if (target == GL_TEXTURE_RECTANGLE_NV) {
         if (!ctx->Extensions.NV_texture_rectangle) {
            _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexImage2D(target)" );
            return GL_TRUE;
         }
         sizeOK = ctx->Driver.TestProxyTexImage(ctx,
                                                GL_PROXY_TEXTURE_RECTANGLE_NV,
                                                level, internalFormat,
                                                format, type,
                                                width, height, 1, border);
      }
      else {
         _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexImage2D(target)" );
         return GL_TRUE;
      }
   }
   else {
      _mesa_problem(ctx, "invalid dimensions in copytexture_error_check");
      return GL_TRUE;
   }

   if (!sizeOK) {
      if (dimensions == 1) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexImage1D(width=%d)", width);
      }
      else {
         ASSERT(dimensions == 2);
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexImage2D(width=%d, height=%d)", width, height);
      }
      return GL_TRUE;
   }

   if (_mesa_base_tex_format(ctx, internalFormat) < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glCopyTexImage%dD(internalFormat)", dimensions);
      return GL_TRUE;
   }

   if (is_compressed_format(ctx, internalFormat)) {
      if (target != GL_TEXTURE_2D) {
         _mesa_error(ctx, GL_INVALID_ENUM,
                     "glCopyTexImage%d(target)", dimensions);
         return GL_TRUE;
      }
      if (border != 0) {
         _mesa_error(ctx, GL_INVALID_OPERATION,
                     "glCopyTexImage%D(border!=0)", dimensions);
         return GL_TRUE;
      }
   }

   /* if we get here, the parameters are OK */
   return GL_FALSE;
}


/**
 * Test glCopyTexImage[12]D() parameters for errors.
 * 
 * \param ctx GL context.
 * \param dimensions texture image dimensions (must be 1, 2 or 3).
 * \param target texture target given by the user.
 * \param level image level given by the user.
 * \param xoffset sub-image x offset given by the user.
 * \param yoffset sub-image y offset given by the user.
 * \param zoffset sub-image z offset given by the user.
 * \param width image width given by the user.
 * \param height image height given by the user.
 * 
 * \return GL_TRUE if an error was detected, or GL_FALSE if no errors.
 * 
 * Verifies each of the parameters against the constants specified in
 * __GLcontextRec::Const and the supported extensions, and according to the
 * OpenGL specification.
 */
static GLboolean
copytexsubimage_error_check( GLcontext *ctx, GLuint dimensions,
                             GLenum target, GLint level,
                             GLint xoffset, GLint yoffset, GLint zoffset,
                             GLsizei width, GLsizei height )
{
   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
   struct gl_texture_image *teximage;

   /* Check target */
   if (dimensions == 1) {
      if (target != GL_TEXTURE_1D) {
         _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage1D(target)" );
         return GL_TRUE;
      }
   }
   else if (dimensions == 2) {
      if (target >= GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB &&
          target <= GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB) {
         if (!ctx->Extensions.ARB_texture_cube_map) {
            _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage2D(target)" );
            return GL_TRUE;
         }
      }
      else if (target == GL_TEXTURE_RECTANGLE_NV) {
         if (!ctx->Extensions.NV_texture_rectangle) {
            _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage2D(target)" );
            return GL_TRUE;
         }
      }
      else if (target != GL_TEXTURE_2D) {
         _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage2D(target)" );
         return GL_TRUE;
      }
   }
   else if (dimensions == 3) {
      if (target != GL_TEXTURE_3D) {
         _mesa_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage3D(target)" );
         return GL_TRUE;
      }
   }

   /* Check level */
   if (level < 0 || level >= MAX_TEXTURE_LEVELS) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glCopyTexSubImage%dD(level=%d)", dimensions, level);
      return GL_TRUE;
   }

   /* Check size */
   if (width < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glCopyTexSubImage%dD(width=%d)", dimensions, width);
      return GL_TRUE;
   }
   if (dimensions > 1 && height < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glCopyTexSubImage%dD(height=%d)", dimensions, height);
      return GL_TRUE;
   }

   teximage = _mesa_select_tex_image(ctx, texUnit, target, level);
   if (!teximage) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glCopyTexSubImage%dD(undefined texture level: %d)",
                  dimensions, level);
      return GL_TRUE;
   }

   if (xoffset < -((GLint)teximage->Border)) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glCopyTexSubImage%dD(xoffset=%d)", dimensions, xoffset);
      return GL_TRUE;
   }
   if (xoffset + width > (GLint) (teximage->Width + teximage->Border)) {
      _mesa_error(ctx, GL_INVALID_VALUE,
                  "glCopyTexSubImage%dD(xoffset+width)", dimensions);
      return GL_TRUE;
   }
   if (dimensions > 1) {
      if (yoffset < -((GLint)teximage->Border)) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexSubImage%dD(yoffset=%d)", dimensions, yoffset);
         return GL_TRUE;
      }
      /* NOTE: we're adding the border here, not subtracting! */
      if (yoffset + height > (GLint) (teximage->Height + teximage->Border)) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexSubImage%dD(yoffset+height)", dimensions);
         return GL_TRUE;
      }
   }

   if (dimensions > 2) {
      if (zoffset < -((GLint)teximage->Border)) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexSubImage%dD(zoffset)", dimensions);
         return GL_TRUE;
      }
      if (zoffset > (GLint) (teximage->Depth + teximage->Border)) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexSubImage%dD(zoffset+depth)", dimensions);
         return GL_TRUE;
      }
   }

   if (teximage->IsCompressed) {
      if (target != GL_TEXTURE_2D) {
         _mesa_error(ctx, GL_INVALID_ENUM,
                     "glCopyTexSubImage%d(target)", dimensions);
         return GL_TRUE;
      }
      /* offset must be multiple of 4 */
      if ((xoffset & 3) || (yoffset & 3)) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexSubImage%D(xoffset or yoffset)", dimensions);
         return GL_TRUE;
      }
      /* size must be multiple of 4 */
      if ((width & 3) != 0 && (GLuint) width != teximage->Width) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexSubImage%D(width)", dimensions);
         return GL_TRUE;
      }         
      if ((height & 3) != 0 && (GLuint) height != teximage->Height) {
         _mesa_error(ctx, GL_INVALID_VALUE,
                     "glCopyTexSubImage%D(height)", dimensions);
         return GL_TRUE;
      }         
   }

   if (teximage->IntFormat == GL_YCBCR_MESA) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glCopyTexSubImage2D");
      return GL_TRUE;
   }

   /* if we get here, the parameters are OK */
   return GL_FALSE;
}


/**
 * Get texture image.  Called by glGetTexImage.
 *
 * \param target texture target.
 * \param level image level.
 * \param format pixel data format for returned image.
 * \param type pixel data type for returned image.
 * \param pixels returned pixel data.
 */
void GLAPIENTRY
_mesa_GetTexImage( GLenum target, GLint level, GLenum format,
                   GLenum type, GLvoid *pixels )
{
   const struct gl_texture_unit *texUnit;
   const struct gl_texture_object *texObj;
   const struct gl_texture_image *texImage;
   GLint maxLevels = 0;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   texUnit = &(ctx->Texture.Unit[ctx->Texture.CurrentUnit]);
   texObj = _mesa_select_tex_object(ctx, texUnit, target);
   if (!texObj || is_proxy_target(target)) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(target)");
      return;
   }

   maxLevels = _mesa_max_texture_levels(ctx, target);
   ASSERT(maxLevels > 0);  /* 0 indicates bad target, caught above */

   if (level < 0 || level >= maxLevels) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );
      return;
   }

   if (_mesa_sizeof_packed_type(type) <= 0) {
      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(type)" );
      return;
   }

   if (_mesa_components_in_format(format) <= 0 ||
       format == GL_STENCIL_INDEX) {
      _mesa_error( ctx, GL_INVALID_ENUM, "glGetTexImage(format)" );
      return;
   }

   if (!ctx->Extensions.EXT_paletted_texture && is_index_format(format)) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
   }

   if (!ctx->Extensions.SGIX_depth_texture &&
       !ctx->Extensions.ARB_depth_texture && is_depth_format(format)) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
   }

   if (!ctx->Extensions.MESA_ycbcr_texture && is_ycbcr_format(format)) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexImage(format)");
   }

   if (!pixels)
      return;

   texImage = _mesa_select_tex_image(ctx, texUnit, target, level);
   if (!texImage) {
      /* invalid mipmap level, not an error */
      return;
   }

   /* Make sure the requested image format is compatible w