Exemple #1
0
/**
 * Allocate a new texture object.
 * Called via ctx->Driver.NewTextureObject.
 * Note: this function will be called during context creation to
 * allocate the default texture objects.
 * Note: we could use containment here to 'derive' the driver-specific
 * texture object from the core mesa gl_texture_object.  Not done at this time.
 */
static struct gl_texture_object *
sisNewTextureObject( GLcontext *ctx, GLuint name, GLenum target )
{
    struct gl_texture_object *obj;
    obj = _mesa_new_texture_object(ctx, name, target);
    return obj;
}
Exemple #2
0
/**
 * Allocate a new texture object.
 * Called via ctx->Driver.NewTextureObject.
 * Note: this function will be called during context creation to
 * allocate the default texture objects.
 * Note: we could use containment here to 'derive' the driver-specific
 * texture object from the core mesa gl_texture_object.  Not done at this time.
 */
static struct gl_texture_object *
mgaNewTextureObject( struct gl_context *ctx, GLuint name, GLenum target )
{
   struct gl_texture_object *obj;
   obj = _mesa_new_texture_object(ctx, name, target);
   mgaAllocTexObj( obj );
   return obj;
}
Exemple #3
0
/**
 * Allocate a new texture object.
 * Called via ctx->Driver.NewTextureObject.
 * Note: we could use containment here to 'derive' the driver-specific
 * texture object from the core mesa gl_texture_object.  Not done at this time.
 */
static struct gl_texture_object *
radeonNewTextureObject( GLcontext *ctx, GLuint name, GLenum target )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   struct gl_texture_object *obj;
   obj = _mesa_new_texture_object(ctx, name, target);
   if (!obj)
      return NULL;
   obj->MaxAnisotropy = rmesa->initialMaxAnisotropy;
   radeonAllocTexObj( obj );
   return obj;
}
Exemple #4
0
void GLAPIENTRY
_mesa_GetInternalformativ(GLenum target, GLenum internalformat, GLenum pname,
                          GLsizei bufSize, GLint *params)
{
   GLint buffer[16];
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   /* ARB_internalformat_query is also mandatory for ARB_internalformat_query2 */
   if (!(_mesa_has_ARB_internalformat_query(ctx) ||
         _mesa_is_gles3(ctx))) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInternalformativ");
      return;
   }

   assert(ctx->Driver.QueryInternalFormat != NULL);

   if (!_legal_parameters(ctx, target, internalformat, pname, bufSize, params))
      return;

   /* initialize the contents of the temporary buffer */
   memcpy(buffer, params, MIN2(bufSize, 16) * sizeof(GLint));

   /* Use the 'unsupported' response defined by the spec for every pname
    * as the default answer.
    */
   _set_default_response(pname, buffer);

   if (!_is_target_supported(ctx, target) ||
       !_is_internalformat_supported(ctx, target, internalformat) ||
       !_is_resource_supported(ctx, target, internalformat, pname))
      goto end;

   switch (pname) {
   case GL_SAMPLES:
      /* fall-through */
   case GL_NUM_SAMPLE_COUNTS:
      /* The ARB_internalformat_query2 sets the response as 'unsupported' for
       * SAMPLES and NUM_SAMPLE_COUNTS:
       *
       *     "If <internalformat> is not color-renderable, depth-renderable, or
       *     stencil-renderable (as defined in section 4.4.4), or if <target>
       *     does not support multiple samples (ie other than
       *     TEXTURE_2D_MULTISAMPLE,  TEXTURE_2D_MULTISAMPLE_ARRAY,
       *     or RENDERBUFFER)."
       */
      if ((target != GL_RENDERBUFFER &&
           target != GL_TEXTURE_2D_MULTISAMPLE &&
           target != GL_TEXTURE_2D_MULTISAMPLE_ARRAY) ||
          !_is_renderable(ctx, internalformat))
         goto end;

      /* The GL ES 3.0 specification, section 6.1.15 page 236 says:
       *
       *     "Since multisampling is not supported for signed and unsigned
       *     integer internal formats, the value of NUM_SAMPLE_COUNTS will be
       *     zero for such formats.
       *
       * Since OpenGL ES 3.1 adds support for multisampled integer formats, we
       * have to check the version for 30 exactly.
       */
      if (pname == GL_NUM_SAMPLE_COUNTS && ctx->API == API_OPENGLES2 &&
          ctx->Version == 30 && _mesa_is_enum_format_integer(internalformat)) {
         goto end;
      }

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_INTERNALFORMAT_SUPPORTED:
      /* Having a supported <internalformat> is implemented as a prerequisite
       * for all the <pnames>. Thus,  if we reach this point, the internalformat is
       * supported.
       */
      buffer[0] = GL_TRUE;
      break;

   case GL_INTERNALFORMAT_PREFERRED:
      /* The ARB_internalformat_query2 spec says:
       *
       *     "- INTERNALFORMAT_PREFERRED: The implementation-preferred internal
       *     format for representing resources of the specified <internalformat> is
       *     returned in <params>.
       *
       * Therefore, we let the driver answer. Note that if we reach this
       * point, it means that the internalformat is supported, so the driver
       * is called just to try to get a preferred format. If not supported,
       * GL_NONE was already returned and the driver is not called.
       */
      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_INTERNALFORMAT_RED_SIZE:
   case GL_INTERNALFORMAT_GREEN_SIZE:
   case GL_INTERNALFORMAT_BLUE_SIZE:
   case GL_INTERNALFORMAT_ALPHA_SIZE:
   case GL_INTERNALFORMAT_DEPTH_SIZE:
   case GL_INTERNALFORMAT_STENCIL_SIZE:
   case GL_INTERNALFORMAT_SHARED_SIZE:
   case GL_INTERNALFORMAT_RED_TYPE:
   case GL_INTERNALFORMAT_GREEN_TYPE:
   case GL_INTERNALFORMAT_BLUE_TYPE:
   case GL_INTERNALFORMAT_ALPHA_TYPE:
   case GL_INTERNALFORMAT_DEPTH_TYPE:
   case GL_INTERNALFORMAT_STENCIL_TYPE: {
      GLint baseformat;
      mesa_format texformat;

      if (target != GL_RENDERBUFFER) {
         if (!_mesa_legal_get_tex_level_parameter_target(ctx, target, true))
            goto end;

         baseformat = _mesa_base_tex_format(ctx, internalformat);
      } else {
         baseformat = _mesa_base_fbo_format(ctx, internalformat);
      }

      /* Let the driver choose the texture format.
       *
       * Disclaimer: I am considering that drivers use for renderbuffers the
       * same format-choice logic as for textures.
       */
      texformat = ctx->Driver.ChooseTextureFormat(ctx, target, internalformat,
                                                  GL_NONE /*format */, GL_NONE /* type */);

      if (texformat == MESA_FORMAT_NONE || baseformat <= 0)
         goto end;

      /* Implementation based on what Mesa does for glGetTexLevelParameteriv
       * and glGetRenderbufferParameteriv functions.
       */
      if (pname == GL_INTERNALFORMAT_SHARED_SIZE) {
         if (_mesa_has_EXT_texture_shared_exponent(ctx) &&
             target != GL_TEXTURE_BUFFER &&
             target != GL_RENDERBUFFER &&
             texformat == MESA_FORMAT_R9G9B9E5_FLOAT) {
            buffer[0] = 5;
         }
         goto end;
      }

      if (!_mesa_base_format_has_channel(baseformat, pname))
         goto end;

      switch (pname) {
      case GL_INTERNALFORMAT_DEPTH_SIZE:
         if (ctx->API != API_OPENGL_CORE &&
             !_mesa_has_ARB_depth_texture(ctx) &&
             target != GL_RENDERBUFFER &&
             target != GL_TEXTURE_BUFFER)
            goto end;
         /* fallthrough */
      case GL_INTERNALFORMAT_RED_SIZE:
      case GL_INTERNALFORMAT_GREEN_SIZE:
      case GL_INTERNALFORMAT_BLUE_SIZE:
      case GL_INTERNALFORMAT_ALPHA_SIZE:
      case GL_INTERNALFORMAT_STENCIL_SIZE:
         buffer[0] = _mesa_get_format_bits(texformat, pname);
         break;

      case GL_INTERNALFORMAT_DEPTH_TYPE:
         if (!_mesa_has_ARB_texture_float(ctx))
            goto end;
         /* fallthrough */
      case GL_INTERNALFORMAT_RED_TYPE:
      case GL_INTERNALFORMAT_GREEN_TYPE:
      case GL_INTERNALFORMAT_BLUE_TYPE:
      case GL_INTERNALFORMAT_ALPHA_TYPE:
      case GL_INTERNALFORMAT_STENCIL_TYPE:
         buffer[0]  = _mesa_get_format_datatype(texformat);
         break;

      default:
         break;

      }
      break;
   }

      /* For WIDTH/HEIGHT/DEPTH/LAYERS there is no reason to think that the
       * returned values should be different to the values returned by
       * GetInteger with MAX_TEXTURE_SIZE, MAX_3D_TEXTURE_SIZE, etc.*/
   case GL_MAX_WIDTH:
   case GL_MAX_HEIGHT:
   case GL_MAX_DEPTH: {
      GLenum get_pname;
      GLint dimensions;
      GLint min_dimensions;

      /* From query2:MAX_HEIGHT spec (as example):
       *
       * "If the resource does not have at least two dimensions, or if the
       * resource is unsupported, zero is returned."
       */
      dimensions = _get_target_dimensions(target);
      min_dimensions = _get_min_dimensions(pname);
      if (dimensions < min_dimensions)
         goto end;

      get_pname = _equivalent_size_pname(target, pname);
      if (get_pname == 0)
         goto end;

      _mesa_GetIntegerv(get_pname, buffer);
      break;
   }

   case GL_MAX_LAYERS:
      if (!_mesa_has_EXT_texture_array(ctx))
         goto end;

      if (!_mesa_is_array_texture(target))
         goto end;

      _mesa_GetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS, buffer);
      break;

   case GL_MAX_COMBINED_DIMENSIONS:{
      GLint64 combined_value = 1;
      GLenum max_dimensions_pnames[] = {
         GL_MAX_WIDTH,
         GL_MAX_HEIGHT,
         GL_MAX_DEPTH,
         GL_SAMPLES
      };
      unsigned i;
      GLint current_value;

      /* Combining the dimensions. Note that for array targets, this would
       * automatically include the value of MAX_LAYERS, as that value is
       * returned as MAX_HEIGHT or MAX_DEPTH */
      for (i = 0; i < 4; i++) {
         if (max_dimensions_pnames[i] == GL_SAMPLES &&
             !_is_multisample_target(target))
            continue;

         _mesa_GetInternalformativ(target, internalformat,
                                   max_dimensions_pnames[i],
                                   1, &current_value);

         if (current_value != 0)
            combined_value *= current_value;
      }

      if (_mesa_is_cube_map_texture(target))
         combined_value *= 6;

      /* We pack the 64-bit value on two 32-bit values. Calling the 32-bit
       * query, this would work as far as the value can be hold on a 32-bit
       * signed integer. For the 64-bit query, the wrapper around the 32-bit
       * query will unpack the value */
      memcpy(buffer, &combined_value, sizeof(GLint64));
      break;
   }

   case GL_COLOR_COMPONENTS:
      /* The ARB_internalformat_query2 spec says:
       *
       *     "- COLOR_COMPONENTS: If the internal format contains any color
       *     components (R, G, B, or A), TRUE is returned in <params>.
       *     If the internal format is unsupported or contains no color
       *     components, FALSE is returned."
       */
      if (_mesa_is_color_format(internalformat))
         buffer[0] = GL_TRUE;
      break;

   case GL_DEPTH_COMPONENTS:
      /* The ARB_internalformat_query2 spec says:
       *
       *     "- DEPTH_COMPONENTS: If the internal format contains a depth
       *     component (D), TRUE is returned in <params>. If the internal format
       *     is unsupported or contains no depth component, FALSE is returned."
       */
      if (_mesa_is_depth_format(internalformat) ||
          _mesa_is_depthstencil_format(internalformat))
         buffer[0] = GL_TRUE;
      break;

   case GL_STENCIL_COMPONENTS:
      /* The ARB_internalformat_query2 spec says:
       *
       *     "- STENCIL_COMPONENTS: If the internal format contains a stencil
       *     component (S), TRUE is returned in <params>. If the internal format
       *     is unsupported or contains no stencil component, FALSE is returned.
       */
      if (_mesa_is_stencil_format(internalformat) ||
          _mesa_is_depthstencil_format(internalformat))
         buffer[0] = GL_TRUE;
      break;

   case GL_COLOR_RENDERABLE:
   case GL_DEPTH_RENDERABLE:
   case GL_STENCIL_RENDERABLE:
      if (!_is_renderable(ctx, internalformat))
         goto end;

      if (pname == GL_COLOR_RENDERABLE) {
         if (!_mesa_is_color_format(internalformat))
            goto end;
      } else {
         GLenum baseFormat = _mesa_base_fbo_format(ctx, internalformat);
         if (baseFormat != GL_DEPTH_STENCIL &&
             ((pname == GL_DEPTH_RENDERABLE && baseFormat != GL_DEPTH_COMPONENT) ||
              (pname == GL_STENCIL_RENDERABLE && baseFormat != GL_STENCIL_INDEX)))
            goto end;
      }

      buffer[0] = GL_TRUE;
      break;

   case GL_FRAMEBUFFER_RENDERABLE_LAYERED:
      if (!_mesa_has_EXT_texture_array(ctx) ||
          _legal_target_for_framebuffer_texture_layer(ctx, target))
         goto end;
      /* fallthrough */
   case GL_FRAMEBUFFER_RENDERABLE:
   case GL_FRAMEBUFFER_BLEND:
      if (!_mesa_has_ARB_framebuffer_object(ctx))
         goto end;

      if (target == GL_TEXTURE_BUFFER ||
          !_is_renderable(ctx, internalformat))
         goto end;

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_READ_PIXELS:
   case GL_READ_PIXELS_FORMAT:
   case GL_READ_PIXELS_TYPE:
      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_TEXTURE_IMAGE_FORMAT:
   case GL_GET_TEXTURE_IMAGE_FORMAT:
   case GL_TEXTURE_IMAGE_TYPE:
   case GL_GET_TEXTURE_IMAGE_TYPE:
      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_MIPMAP:
   case GL_MANUAL_GENERATE_MIPMAP:
   case GL_AUTO_GENERATE_MIPMAP:
      if (!_mesa_is_valid_generate_texture_mipmap_target(ctx, target) ||
          !_mesa_is_valid_generate_texture_mipmap_internalformat(ctx,
                                                              internalformat)) {
         goto end;
      }

      if (pname == GL_MIPMAP) {
         buffer[0] = GL_TRUE;
         goto end;
      }
      else if (pname == GL_MANUAL_GENERATE_MIPMAP) {
         if (!_mesa_has_ARB_framebuffer_object(ctx))
            goto end;
      }
      else {
         /* From ARB_internalformat_query2:
          *    "Dependencies on OpenGL 3.2 (Core Profile)
          *     In core profiles for OpenGL 3.2 and later versions, queries
          *     for the AUTO_GENERATE_MIPMAP <pname> return the appropriate
          *     unsupported response."
          */
         if (_mesa_is_desktop_gl(ctx) && ctx->Version >= 32)
            goto end;
      }

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_COLOR_ENCODING:
      if (!_mesa_is_color_format(internalformat))
         goto end;

      if (_mesa_is_srgb_format(internalformat))
         buffer[0] = GL_SRGB;
      else
         buffer[0] = GL_LINEAR;
      break;

   case GL_SRGB_READ:
      if (!_mesa_has_EXT_texture_sRGB(ctx) ||
          !_mesa_is_srgb_format(internalformat)) {
         goto end;
      }

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_SRGB_WRITE:
      if (!_mesa_has_EXT_framebuffer_sRGB(ctx) ||
          !_mesa_is_color_format(internalformat)) {
         goto end;
      }

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_SRGB_DECODE_ARB:
      /* Presence of EXT_texture_sRGB_decode was already verified */
      if (!_mesa_has_EXT_texture_sRGB(ctx) ||
          target == GL_RENDERBUFFER ||
          !_mesa_is_srgb_format(internalformat)) {
         goto end;
      }

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_FILTER:
      /* If it doesn't allow to set sampler parameters then it would not allow
       * to set a filter different to GL_NEAREST. In practice, this method
       * only filters out MULTISAMPLE/MULTISAMPLE_ARRAY */
      if (!_mesa_target_allows_setting_sampler_parameters(target))
         goto end;

      if (_mesa_is_enum_format_integer(internalformat))
         goto end;

      if (target == GL_TEXTURE_BUFFER)
         goto end;

      /* At this point we know that multi-texel filtering is supported. We
       * need to call the driver to know if it is CAVEAT_SUPPORT or
       * FULL_SUPPORT.
       */
      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_VERTEX_TEXTURE:
   case GL_TESS_CONTROL_TEXTURE:
   case GL_TESS_EVALUATION_TEXTURE:
   case GL_GEOMETRY_TEXTURE:
   case GL_FRAGMENT_TEXTURE:
   case GL_COMPUTE_TEXTURE:
      if (target == GL_RENDERBUFFER)
         goto end;

      if ((pname == GL_TESS_CONTROL_TEXTURE ||
           pname == GL_TESS_EVALUATION_TEXTURE) &&
          !_mesa_has_tessellation(ctx))
         goto end;

      if (pname == GL_GEOMETRY_TEXTURE && !_mesa_has_geometry_shaders(ctx))
         goto end;

      if (pname == GL_COMPUTE_TEXTURE && !_mesa_has_compute_shaders(ctx))
         goto end;

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_TEXTURE_GATHER:
   case GL_TEXTURE_GATHER_SHADOW:
      if (!_mesa_has_ARB_texture_gather(ctx))
         goto end;

      /* fallthrough */
   case GL_TEXTURE_SHADOW:
      /* Only depth or depth-stencil image formats make sense in shadow
         samplers */
      if (pname != GL_TEXTURE_GATHER &&
          !_mesa_is_depth_format(internalformat) &&
          !_mesa_is_depthstencil_format(internalformat))
         goto end;

      /* Validate the target for shadow and gather operations */
      switch (target) {
      case GL_TEXTURE_2D:
      case GL_TEXTURE_2D_ARRAY:
      case GL_TEXTURE_CUBE_MAP:
      case GL_TEXTURE_CUBE_MAP_ARRAY:
      case GL_TEXTURE_RECTANGLE:
         break;

      case GL_TEXTURE_1D:
      case GL_TEXTURE_1D_ARRAY:
         /* 1D and 1DArray textures are not admitted in gather operations */
         if (pname != GL_TEXTURE_SHADOW)
            goto end;
         break;

      default:
         goto end;
      }

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_SHADER_IMAGE_LOAD:
   case GL_SHADER_IMAGE_STORE:
      if (!_mesa_has_ARB_shader_image_load_store(ctx))
         goto end;

      /* We call to _mesa_is_shader_image_format_supported
       * using "internalformat" as parameter, because the
       * the ARB_internalformat_query2 spec says:
       * "In this case the <internalformat> is the value of the <format>
       * parameter that is passed to BindImageTexture."
       */
      if (target == GL_RENDERBUFFER ||
          !_mesa_is_shader_image_format_supported(ctx, internalformat))
         goto end;

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_SHADER_IMAGE_ATOMIC:
      if (!_mesa_has_ARB_shader_image_load_store(ctx))
         goto end;

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_IMAGE_TEXEL_SIZE: {
      mesa_format image_format;

      if (!_mesa_has_ARB_shader_image_load_store(ctx) ||
          target == GL_RENDERBUFFER)
         goto end;

      image_format = _mesa_get_shader_image_format(internalformat);
      if (image_format == MESA_FORMAT_NONE)
         goto end;

      /* We return bits */
      buffer[0] = (_mesa_get_format_bytes(image_format) * 8);
      break;
   }

   case GL_IMAGE_COMPATIBILITY_CLASS:
      if (!_mesa_has_ARB_shader_image_load_store(ctx) ||
          target == GL_RENDERBUFFER)
         goto end;

      buffer[0] = _mesa_get_image_format_class(internalformat);
      break;

   case GL_IMAGE_PIXEL_FORMAT: {
      GLint base_format;

      if (!_mesa_has_ARB_shader_image_load_store(ctx) ||
          target == GL_RENDERBUFFER ||
          !_mesa_is_shader_image_format_supported(ctx, internalformat))
         goto end;

      base_format = _mesa_base_tex_format(ctx, internalformat);
      if (base_format == -1)
         goto end;

      if (_mesa_is_enum_format_integer(internalformat))
         buffer[0] = _mesa_base_format_to_integer_format(base_format);
      else
         buffer[0] = base_format;
      break;
   }

   case GL_IMAGE_PIXEL_TYPE: {
      mesa_format image_format;
      GLenum datatype;
      GLuint comps;

      if (!_mesa_has_ARB_shader_image_load_store(ctx) ||
          target == GL_RENDERBUFFER)
         goto end;

      image_format = _mesa_get_shader_image_format(internalformat);
      if (image_format == MESA_FORMAT_NONE)
         goto end;

      _mesa_uncompressed_format_to_type_and_comps(image_format, &datatype,
                                                  &comps);
      if (!datatype)
         goto end;

      buffer[0] = datatype;
      break;
   }

   case GL_IMAGE_FORMAT_COMPATIBILITY_TYPE: {
      if (!_mesa_has_ARB_shader_image_load_store(ctx))
         goto end;

      if (!_mesa_legal_get_tex_level_parameter_target(ctx, target, true))
         goto end;

      /* From spec: "Equivalent to calling GetTexParameter with <value> set
       * to IMAGE_FORMAT_COMPATIBILITY_TYPE."
       *
       * GetTexParameter just returns
       * tex_obj->ImageFormatCompatibilityType. We create a fake tex_obj
       * just with the purpose of getting the value.
       */
      struct gl_texture_object *tex_obj = _mesa_new_texture_object(ctx, 0, target);
      buffer[0] = tex_obj->ImageFormatCompatibilityType;
      _mesa_delete_texture_object(ctx, tex_obj);

      break;
   }

   case GL_SIMULTANEOUS_TEXTURE_AND_DEPTH_TEST:
   case GL_SIMULTANEOUS_TEXTURE_AND_STENCIL_TEST:
   case GL_SIMULTANEOUS_TEXTURE_AND_DEPTH_WRITE:
   case GL_SIMULTANEOUS_TEXTURE_AND_STENCIL_WRITE:
      if (target == GL_RENDERBUFFER)
         goto end;

      if (!_mesa_is_depthstencil_format(internalformat)) {
         if (((pname == GL_SIMULTANEOUS_TEXTURE_AND_DEPTH_TEST ||
               pname == GL_SIMULTANEOUS_TEXTURE_AND_DEPTH_WRITE) &&
              !_mesa_is_depth_format(internalformat)) ||
             ((pname == GL_SIMULTANEOUS_TEXTURE_AND_STENCIL_TEST ||
               pname == GL_SIMULTANEOUS_TEXTURE_AND_STENCIL_WRITE) &&
              !_mesa_is_stencil_format(internalformat)))
            goto end;
      }

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_TEXTURE_COMPRESSED:
      buffer[0] = _mesa_is_compressed_format(ctx, internalformat);
      break;

   case GL_TEXTURE_COMPRESSED_BLOCK_WIDTH:
   case GL_TEXTURE_COMPRESSED_BLOCK_HEIGHT:
   case GL_TEXTURE_COMPRESSED_BLOCK_SIZE: {
      mesa_format mesaformat;
      GLint block_size;

      mesaformat = _mesa_glenum_to_compressed_format(internalformat);
      if (mesaformat == MESA_FORMAT_NONE)
         goto end;

      block_size = _mesa_get_format_bytes(mesaformat);
      assert(block_size > 0);

      if (pname == GL_TEXTURE_COMPRESSED_BLOCK_SIZE) {
         buffer[0] = block_size;
      } else {
         GLuint bwidth, bheight;

         /* Returns the width and height in pixels. We return bytes */
         _mesa_get_format_block_size(mesaformat, &bwidth, &bheight);
         assert(bwidth > 0 && bheight > 0);

         if (pname == GL_TEXTURE_COMPRESSED_BLOCK_WIDTH)
            buffer[0] = block_size / bheight;
         else
            buffer[0] = block_size / bwidth;
      }
      break;
   }

   case GL_CLEAR_BUFFER:
      if (target != GL_TEXTURE_BUFFER)
         goto end;

      ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                      buffer);
      break;

   case GL_TEXTURE_VIEW:
   case GL_VIEW_COMPATIBILITY_CLASS:
      if (!_mesa_has_ARB_texture_view(ctx) ||
          target == GL_TEXTURE_BUFFER ||
          target == GL_RENDERBUFFER)
         goto end;

      if (pname == GL_TEXTURE_VIEW) {
         ctx->Driver.QueryInternalFormat(ctx, target, internalformat, pname,
                                         buffer);
      } else {
         GLenum view_class = _mesa_texture_view_lookup_view_class(ctx,
                                                                  internalformat);
         if (view_class == GL_FALSE)
            goto end;

         buffer[0] = view_class;
      }
      break;

   default:
      unreachable("bad param");
   }

 end:
   if (bufSize != 0 && params == NULL) {
      /* Emit a warning to aid application debugging, but go ahead and do the
       * memcpy (and probably crash) anyway.
       */
      _mesa_warning(ctx,
                    "glGetInternalformativ(bufSize = %d, but params = NULL)",
                    bufSize);
   }

   /* Copy the data from the temporary buffer to the buffer supplied by the
    * application.  Clamp the size of the copy to the size supplied by the
    * application.
    */
   memcpy(params, buffer, MIN2(bufSize, 16) * sizeof(GLint));

   return;
}