boolean r300_pick_fragment_shader(struct r300_context* r300)
{
struct r300_fragment_shader* fs = r300_fs(r300);
struct r300_fragment_program_external_state state = {{{ 0 }}};
struct r300_fragment_shader_code* ptr;
get_external_state(r300, &state);
if (!fs->first) {
/* Build the fragment shader for the first time. */
fs->first = fs->shader = CALLOC_STRUCT(r300_fragment_shader_code);
memcpy(&fs->shader->compare_state, &state,
sizeof(struct r300_fragment_program_external_state));
r300_translate_fragment_shader(r300, fs->shader, fs->state.tokens);
return TRUE;
} else {
/* Check if the currently-bound shader has been compiled
* with the texture-compare state we need. */
if (memcmp(&fs->shader->compare_state, &state, sizeof(state)) != 0) {
/* Search for the right shader. */
ptr = fs->first;
while (ptr) {
if (memcmp(&ptr->compare_state, &state, sizeof(state)) == 0) {
if (fs->shader != ptr) {
fs->shader = ptr;
return TRUE;
}
/* The currently-bound one is OK. */
return FALSE;
}
ptr = ptr->next;
}
/* Not found, gotta compile a new one. */
ptr = CALLOC_STRUCT(r300_fragment_shader_code);
ptr->next = fs->first;
fs->first = fs->shader = ptr;
ptr->compare_state = state;
r300_translate_fragment_shader(r300, ptr, fs->state.tokens);
return TRUE;
}
}
return FALSE;
}
/* Bind fragment shader state. */
static void r300_bind_fs_state(struct pipe_context* pipe, void* shader)
{
struct r300_context* r300 = r300_context(pipe);
struct r300_fragment_shader* fs = (struct r300_fragment_shader*)shader;
if (fs == NULL) {
r300->fs = NULL;
return;
} else if (!fs->translated) {
r300_translate_fragment_shader(r300, fs);
}
r300->fs = fs;
r300->dirty_state |= R300_NEW_FRAGMENT_SHADER | R300_NEW_FRAGMENT_SHADER_CONSTANTS;
}
static void r300_dummy_fragment_shader(
struct r300_context* r300,
struct r300_fragment_shader_code* shader)
{
struct pipe_shader_state state;
struct ureg_program *ureg;
struct ureg_dst out;
struct ureg_src imm;
/* Make a simple fragment shader which outputs (0, 0, 0, 1) */
ureg = ureg_create(TGSI_PROCESSOR_FRAGMENT);
out = ureg_DECL_output(ureg, TGSI_SEMANTIC_COLOR, 0);
imm = ureg_imm4f(ureg, 0, 0, 0, 1);
ureg_MOV(ureg, out, imm);
ureg_END(ureg);
state.tokens = ureg_finalize(ureg);
shader->dummy = TRUE;
r300_translate_fragment_shader(r300, shader, state.tokens);
ureg_destroy(ureg);
}