+static void
+get_tex_level_parameter_buffer(struct gl_context *ctx,
+ const struct gl_texture_object *texObj,
+ GLenum pname, GLint *params)
+{
+ const struct gl_buffer_object *bo = texObj->BufferObject;
+ gl_format texFormat = texObj->_BufferObjectFormat;
+ GLenum internalFormat = texObj->BufferObjectFormat;
+ GLenum baseFormat = _mesa_get_format_base_format(texFormat);
+
+ if (!bo) {
+ /* undefined texture buffer object */
+ *params = pname == GL_TEXTURE_COMPONENTS ? 1 : 0;
+ return;
+ }
+
+ switch (pname) {
+ case GL_TEXTURE_BUFFER_DATA_STORE_BINDING:
+ *params = bo->Name;
+ break;
+ case GL_TEXTURE_WIDTH:
+ *params = bo->Size;
+ break;
+ case GL_TEXTURE_HEIGHT:
+ case GL_TEXTURE_DEPTH:
+ case GL_TEXTURE_BORDER:
+ case GL_TEXTURE_SHARED_SIZE:
+ case GL_TEXTURE_COMPRESSED:
+ *params = 0;
+ break;
+ case GL_TEXTURE_INTERNAL_FORMAT:
+ *params = internalFormat;
+ break;
+ case GL_TEXTURE_RED_SIZE:
+ case GL_TEXTURE_GREEN_SIZE:
+ case GL_TEXTURE_BLUE_SIZE:
+ case GL_TEXTURE_ALPHA_SIZE:
+ if (_mesa_base_format_has_channel(baseFormat, pname))
+ *params = _mesa_get_format_bits(texFormat, pname);
+ else
+ *params = 0;
+ break;
+ case GL_TEXTURE_INTENSITY_SIZE:
+ case GL_TEXTURE_LUMINANCE_SIZE:
+ if (_mesa_base_format_has_channel(baseFormat, pname)) {
+ *params = _mesa_get_format_bits(texFormat, pname);
+ if (*params == 0) {
+ /* intensity or luminance is probably stored as RGB[A] */
+ *params = MIN2(_mesa_get_format_bits(texFormat,
+ GL_TEXTURE_RED_SIZE),
+ _mesa_get_format_bits(texFormat,
+ GL_TEXTURE_GREEN_SIZE));
+ }
+ } else {
+ *params = 0;
+ }
+ break;
+ case GL_TEXTURE_DEPTH_SIZE_ARB:
+ case GL_TEXTURE_STENCIL_SIZE_EXT:
+ *params = _mesa_get_format_bits(texFormat, pname);
+ break;
+
+ /* GL_ARB_texture_compression */
+ case GL_TEXTURE_COMPRESSED_IMAGE_SIZE:
+ /* Always illegal for GL_TEXTURE_BUFFER */
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetTexLevelParameter[if]v(pname)");
+ break;
+
+ /* GL_ARB_texture_float */
+ case GL_TEXTURE_RED_TYPE_ARB:
+ case GL_TEXTURE_GREEN_TYPE_ARB:
+ case GL_TEXTURE_BLUE_TYPE_ARB:
+ case GL_TEXTURE_ALPHA_TYPE_ARB:
+ case GL_TEXTURE_LUMINANCE_TYPE_ARB:
+ case GL_TEXTURE_INTENSITY_TYPE_ARB:
+ case GL_TEXTURE_DEPTH_TYPE_ARB:
+ if (!ctx->Extensions.ARB_texture_float)
+ goto invalid_pname;
+ if (_mesa_base_format_has_channel(baseFormat, pname))
+ *params = _mesa_get_format_datatype(texFormat);
+ else
+ *params = GL_NONE;
+ break;
+
+ default:
+ goto invalid_pname;
+ }
+
+ /* no error if we get here */
+ return;
+
+invalid_pname:
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glGetTexLevelParameter[if]v(pname=%s)",
+ _mesa_lookup_enum_by_nr(pname));
+}
+
+
+void GLAPIENTRY
+_mesa_GetTexLevelParameterfv( GLenum target, GLint level,
+ GLenum pname, GLfloat *params )
+{
+ GLint iparam;
+ _mesa_GetTexLevelParameteriv( target, level, pname, &iparam );
+ *params = (GLfloat) iparam;
+}
+
+
+void GLAPIENTRY
+_mesa_GetTexLevelParameteriv( GLenum target, GLint level,
+ GLenum pname, GLint *params )
+{
+ const struct gl_texture_unit *texUnit;
+ struct gl_texture_object *texObj;
+ GLint maxLevels;
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (ctx->Texture.CurrentUnit >= ctx->Const.MaxCombinedTextureImageUnits) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glGetTexLevelParameteriv(current unit)");
+ return;
+ }
+
+ texUnit = _mesa_get_current_tex_unit(ctx);
+
+ if (!legal_get_tex_level_parameter_target(ctx, target)) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glGetTexLevelParameter[if]v(target=0x%x)", target);
+ return;
+ }
+
+ maxLevels = _mesa_max_texture_levels(ctx, target);
+ assert(maxLevels != 0);
+
+ if (level < 0 || level >= maxLevels) {
+ _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexLevelParameter[if]v" );
+ return;
+ }
+
+ texObj = _mesa_select_tex_object(ctx, texUnit, target);
+
+ if (target == GL_TEXTURE_BUFFER)
+ get_tex_level_parameter_buffer(ctx, texObj, pname, params);
+ else
+ get_tex_level_parameter_image(ctx, texObj, target, level, pname, params);
+}
+