- case GL_ONE_MINUS_SRC_COLOR:
- case GL_ONE_MINUS_SRC_ALPHA:
- map |= flags & INVERT ? 0 : COMBINER_INVERT;
- break;
+static uint32_t
+get_input_arg(struct combiner_state *rc, int arg, int flags)
+{
+ int source = rc->source[arg];
+ int operand = rc->operand[arg];
+
+ /* Fake several unsupported texture formats. */
+ if (is_texture_source(source)) {
+ int i = (source == GL_TEXTURE ?
+ rc->unit : source - GL_TEXTURE0);
+ struct gl_texture_object *t = rc->ctx->Texture.Unit[i]._Current;
+ gl_format format = t->Image[0][t->BaseLevel]->TexFormat;
+
+ if (format == MESA_FORMAT_A8) {
+ /* Emulated using I8. */
+ if (is_color_operand(operand))
+ return COMBINER_SOURCE(ZERO) |
+ get_input_mapping(rc, operand, flags);
+
+ } else if (format == MESA_FORMAT_L8) {
+ /* Emulated using I8. */
+ if (!is_color_operand(operand))
+ return COMBINER_SOURCE(ZERO) |
+ get_input_mapping(rc, operand,
+ flags ^ INVERT);
+ }