+/**
+ * Does the given base texture/renderbuffer format have the channel
+ * named by 'pname'?
+ */
+GLboolean
+_mesa_base_format_has_channel(GLenum base_format, GLenum pname)
+{
+ switch (pname) {
+ case GL_TEXTURE_RED_SIZE:
+ case GL_TEXTURE_RED_TYPE:
+ case GL_RENDERBUFFER_RED_SIZE_EXT:
+ case GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE:
+ if (base_format == GL_RED ||
+ base_format == GL_RG ||
+ base_format == GL_RGB ||
+ base_format == GL_RGBA) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ case GL_TEXTURE_GREEN_SIZE:
+ case GL_TEXTURE_GREEN_TYPE:
+ case GL_RENDERBUFFER_GREEN_SIZE_EXT:
+ case GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:
+ if (base_format == GL_RG ||
+ base_format == GL_RGB ||
+ base_format == GL_RGBA) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ case GL_TEXTURE_BLUE_SIZE:
+ case GL_TEXTURE_BLUE_TYPE:
+ case GL_RENDERBUFFER_BLUE_SIZE_EXT:
+ case GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE:
+ if (base_format == GL_RGB ||
+ base_format == GL_RGBA) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ case GL_TEXTURE_ALPHA_SIZE:
+ case GL_TEXTURE_ALPHA_TYPE:
+ case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
+ case GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE:
+ if (base_format == GL_RGBA ||
+ base_format == GL_ALPHA ||
+ base_format == GL_LUMINANCE_ALPHA) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ case GL_TEXTURE_LUMINANCE_SIZE:
+ case GL_TEXTURE_LUMINANCE_TYPE:
+ if (base_format == GL_LUMINANCE ||
+ base_format == GL_LUMINANCE_ALPHA) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ case GL_TEXTURE_INTENSITY_SIZE:
+ case GL_TEXTURE_INTENSITY_TYPE:
+ if (base_format == GL_INTENSITY) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ case GL_TEXTURE_DEPTH_SIZE:
+ case GL_TEXTURE_DEPTH_TYPE:
+ case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
+ case GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE:
+ if (base_format == GL_DEPTH_STENCIL ||
+ base_format == GL_DEPTH_COMPONENT) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
+ case GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE:
+ if (base_format == GL_DEPTH_STENCIL ||
+ base_format == GL_STENCIL_INDEX) {
+ return GL_TRUE;
+ }
+ return GL_FALSE;
+ default:
+ _mesa_warning(NULL, "%s: Unexpected channel token 0x%x\n",
+ __FUNCTION__, pname);
+ return GL_FALSE;
+ }
+
+ return GL_FALSE;
+}
+
+