static void
lower_texcoord_array(struct gl_linked_shader *shader, const varying_info_visitor *info)
{
replace_varyings_visitor(shader, info,
(1 << MAX_TEXTURE_COORD_UNITS) - 1,
1 | 2, true);
}
static void
lower_texcoord_array(exec_list *ir, const varying_info_visitor *info)
{
replace_varyings_visitor(ir, info,
(1 << MAX_TEXTURE_COORD_UNITS) - 1,
1 | 2, true);
}
static void
lower_fragdata_array(struct gl_linked_shader *shader)
{
varying_info_visitor info(ir_var_shader_out, true);
info.get(shader->ir, 0, NULL);
replace_varyings_visitor(shader, &info, 0, 0, 0);
}
static void
lower_fragdata_array(exec_list *ir)
{
varying_info_visitor info(ir_var_shader_out, true);
info.get(ir, 0, NULL);
replace_varyings_visitor(ir, &info, 0, 0, 0);
}
void
do_dead_builtin_varyings(struct gl_context *ctx,
gl_linked_shader *producer,
gl_linked_shader *consumer,
unsigned num_tfeedback_decls,
tfeedback_decl *tfeedback_decls)
{
/* Lower the gl_FragData array to separate variables. */
if (consumer && consumer->Stage == MESA_SHADER_FRAGMENT) {
lower_fragdata_array(consumer);
}
/* Lowering of built-in varyings has no effect with the core context and
* GLES2, because they are not available there.
*/
if (ctx->API == API_OPENGL_CORE ||
ctx->API == API_OPENGLES2) {
return;
}
/* Information about built-in varyings. */
varying_info_visitor producer_info(ir_var_shader_out);
varying_info_visitor consumer_info(ir_var_shader_in);
if (producer) {
producer_info.get(producer->ir, num_tfeedback_decls, tfeedback_decls);
if (!consumer) {
/* At least eliminate unused gl_TexCoord elements. */
if (producer_info.lower_texcoord_array) {
lower_texcoord_array(producer, &producer_info);
}
return;
}
}
if (consumer) {
consumer_info.get(consumer->ir, 0, NULL);
if (!producer) {
/* At least eliminate unused gl_TexCoord elements. */
if (consumer_info.lower_texcoord_array) {
lower_texcoord_array(consumer, &consumer_info);
}
return;
}
}
/* Eliminate the outputs unused by the consumer. */
if (producer_info.lower_texcoord_array ||
producer_info.color_usage ||
producer_info.has_fog) {
replace_varyings_visitor(producer,
&producer_info,
consumer_info.texcoord_usage,
consumer_info.color_usage,
consumer_info.has_fog);
}
/* The gl_TexCoord fragment shader inputs can be initialized
* by GL_COORD_REPLACE, so we can't eliminate them.
*
* This doesn't prevent elimination of the gl_TexCoord elements which
* are not read by the fragment shader. We want to eliminate those anyway.
*/
if (consumer->Stage == MESA_SHADER_FRAGMENT) {
producer_info.texcoord_usage = (1 << MAX_TEXTURE_COORD_UNITS) - 1;
}
/* Eliminate the inputs uninitialized by the producer. */
if (consumer_info.lower_texcoord_array ||
consumer_info.color_usage ||
consumer_info.has_fog) {
replace_varyings_visitor(consumer,
&consumer_info,
producer_info.texcoord_usage,
producer_info.color_usage,
producer_info.has_fog);
}
}
