static void r300_dummy_vertex_shader(
struct r300_context* r300,
struct r300_vertex_shader* shader)
{
struct ureg_program *ureg;
struct ureg_dst dst;
struct ureg_src imm;
/* Make a simple vertex shader which outputs (0, 0, 0, 1),
* effectively rendering nothing. */
ureg = ureg_create(TGSI_PROCESSOR_VERTEX);
dst = ureg_DECL_output(ureg, TGSI_SEMANTIC_POSITION, 0);
imm = ureg_imm4f(ureg, 0, 0, 0, 1);
ureg_MOV(ureg, dst, imm);
ureg_END(ureg);
shader->state.tokens = tgsi_dup_tokens(ureg_finalize(ureg));
ureg_destroy(ureg);
shader->dummy = TRUE;
r300_init_vs_outputs(r300, shader);
r300_translate_vertex_shader(r300, shader);
}
void r300_draw_init_vertex_shader(struct r300_context *r300,
struct r300_vertex_shader *vs)
{
struct draw_context *draw = r300->draw;
struct pipe_shader_state new_vs;
struct tgsi_shader_info info;
struct vs_transform_context transform;
const uint newLen = tgsi_num_tokens(vs->state.tokens) + 100 /* XXX */;
unsigned i;
tgsi_scan_shader(vs->state.tokens, &info);
new_vs.tokens = tgsi_alloc_tokens(newLen);
if (new_vs.tokens == NULL)
return;
memset(&transform, 0, sizeof(transform));
for (i = 0; i < Elements(transform.out_remap); i++) {
transform.out_remap[i] = i;
}
transform.last_generic = -1;
transform.base.transform_instruction = transform_inst;
transform.base.transform_declaration = transform_decl;
for (i = 0; i < info.num_outputs; i++) {
unsigned index = info.output_semantic_index[i];
switch (info.output_semantic_name[i]) {
case TGSI_SEMANTIC_COLOR:
assert(index < 2);
transform.color_used[index] = TRUE;
break;
case TGSI_SEMANTIC_BCOLOR:
assert(index < 2);
transform.bcolor_used[index] = TRUE;
break;
}
}
tgsi_transform_shader(vs->state.tokens,
(struct tgsi_token*)new_vs.tokens,
newLen, &transform.base);
#if 0
printf("----------------------------------------------\norig shader:\n");
tgsi_dump(vs->state.tokens, 0);
printf("----------------------------------------------\nnew shader:\n");
tgsi_dump(new_vs.tokens, 0);
printf("----------------------------------------------\n");
#endif
/* Free old tokens. */
FREE((void*)vs->state.tokens);
vs->draw_vs = draw_create_vertex_shader(draw, &new_vs);
/* Instead of duplicating and freeing the tokens, copy the pointer directly. */
vs->state.tokens = new_vs.tokens;
/* Init the VS output table for the rasterizer. */
r300_init_vs_outputs(r300, vs);
/* Make the last generic be WPOS. */
vs->outputs.wpos = vs->outputs.generic[transform.last_generic + 1];
vs->outputs.generic[transform.last_generic + 1] = ATTR_UNUSED;
}
