2015-12-22 02:27:25 +00:00
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/*
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* Copyright © 2015 Red Hat
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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/* Lower glDrawPixels().
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*
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* This is based on the logic in st_get_drawpix_shader() in TGSI compiler.
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*
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* Run before nir_lower_io.
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*/
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typedef struct {
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const nir_lower_drawpixels_options *options;
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nir_shader *shader;
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nir_builder b;
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2019-10-01 03:16:55 +01:00
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nir_variable *texcoord, *texcoord_const, *scale, *bias, *tex, *pixelmap;
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2015-12-22 02:27:25 +00:00
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} lower_drawpixels_state;
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static nir_ssa_def *
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get_texcoord(lower_drawpixels_state *state)
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{
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if (state->texcoord == NULL) {
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nir_variable *texcoord = NULL;
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/* find gl_TexCoord, if it exists: */
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2020-07-19 00:24:25 +01:00
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nir_foreach_shader_in_variable(var, state->shader) {
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2015-12-22 02:27:25 +00:00
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if (var->data.location == VARYING_SLOT_TEX0) {
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texcoord = var;
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break;
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}
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}
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/* otherwise create it: */
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if (texcoord == NULL) {
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texcoord = nir_variable_create(state->shader,
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nir_var_shader_in,
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glsl_vec4_type(),
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"gl_TexCoord");
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texcoord->data.location = VARYING_SLOT_TEX0;
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}
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state->texcoord = texcoord;
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}
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return nir_load_var(&state->b, state->texcoord);
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}
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static nir_variable *
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2017-11-16 03:29:35 +00:00
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create_uniform(nir_shader *shader, const char *name,
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2017-11-16 15:19:22 +00:00
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const gl_state_index16 state_tokens[STATE_LENGTH])
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2015-12-22 02:27:25 +00:00
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{
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nir_variable *var = nir_variable_create(shader,
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nir_var_uniform,
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glsl_vec4_type(),
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name);
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var->num_state_slots = 1;
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var->state_slots = ralloc_array(var, nir_state_slot, 1);
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memcpy(var->state_slots[0].tokens, state_tokens,
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sizeof(var->state_slots[0].tokens));
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return var;
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}
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static nir_ssa_def *
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get_scale(lower_drawpixels_state *state)
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{
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if (state->scale == NULL) {
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state->scale = create_uniform(state->shader, "gl_PTscale",
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state->options->scale_state_tokens);
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}
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return nir_load_var(&state->b, state->scale);
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}
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static nir_ssa_def *
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get_bias(lower_drawpixels_state *state)
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{
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if (state->bias == NULL) {
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state->bias = create_uniform(state->shader, "gl_PTbias",
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state->options->bias_state_tokens);
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}
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return nir_load_var(&state->b, state->bias);
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}
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static nir_ssa_def *
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get_texcoord_const(lower_drawpixels_state *state)
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{
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2019-10-01 03:16:55 +01:00
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if (state->texcoord_const == NULL) {
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state->texcoord_const = create_uniform(state->shader,
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"gl_MultiTexCoord0",
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2015-12-22 02:27:25 +00:00
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state->options->texcoord_state_tokens);
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}
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2019-10-01 03:16:55 +01:00
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return nir_load_var(&state->b, state->texcoord_const);
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2015-12-22 02:27:25 +00:00
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}
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static void
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lower_color(lower_drawpixels_state *state, nir_intrinsic_instr *intr)
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{
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nir_builder *b = &state->b;
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nir_ssa_def *texcoord;
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nir_tex_instr *tex;
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nir_ssa_def *def;
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assert(intr->dest.is_ssa);
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b->cursor = nir_before_instr(&intr->instr);
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texcoord = get_texcoord(state);
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2018-08-24 09:34:30 +01:00
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const struct glsl_type *sampler2D =
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glsl_sampler_type(GLSL_SAMPLER_DIM_2D, false, false, GLSL_TYPE_FLOAT);
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if (!state->tex) {
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state->tex =
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nir_variable_create(b->shader, nir_var_uniform, sampler2D, "drawpix");
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state->tex->data.binding = state->options->drawpix_sampler;
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2019-02-06 07:24:51 +00:00
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state->tex->data.explicit_binding = true;
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state->tex->data.how_declared = nir_var_hidden;
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2018-08-24 09:34:30 +01:00
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}
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2019-02-06 07:24:51 +00:00
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nir_deref_instr *tex_deref = nir_build_deref_var(b, state->tex);
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2015-12-22 02:27:25 +00:00
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/* replace load_var(gl_Color) w/ texture sample:
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* TEX def, texcoord, drawpix_sampler, 2D
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*/
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2019-02-06 07:24:51 +00:00
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tex = nir_tex_instr_create(state->shader, 3);
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2015-12-22 02:27:25 +00:00
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tex->op = nir_texop_tex;
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tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
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tex->coord_components = 2;
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2020-12-08 12:45:55 +00:00
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tex->dest_type = nir_type_float32;
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2019-02-06 07:24:51 +00:00
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tex->src[0].src_type = nir_tex_src_texture_deref;
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tex->src[0].src = nir_src_for_ssa(&tex_deref->dest.ssa);
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tex->src[1].src_type = nir_tex_src_sampler_deref;
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tex->src[1].src = nir_src_for_ssa(&tex_deref->dest.ssa);
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tex->src[2].src_type = nir_tex_src_coord;
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tex->src[2].src =
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2017-03-08 23:20:31 +00:00
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nir_src_for_ssa(nir_channels(b, texcoord,
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(1 << tex->coord_components) - 1));
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2015-12-22 02:27:25 +00:00
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nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
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nir_builder_instr_insert(b, &tex->instr);
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def = &tex->dest.ssa;
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/* Apply the scale and bias. */
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if (state->options->scale_and_bias) {
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/* MAD def, def, scale, bias; */
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def = nir_ffma(b, def, get_scale(state), get_bias(state));
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}
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if (state->options->pixel_maps) {
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2018-08-24 09:34:30 +01:00
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if (!state->pixelmap) {
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state->pixelmap = nir_variable_create(b->shader, nir_var_uniform,
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sampler2D, "pixelmap");
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state->pixelmap->data.binding = state->options->pixelmap_sampler;
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2019-02-06 07:24:51 +00:00
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state->pixelmap->data.explicit_binding = true;
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state->pixelmap->data.how_declared = nir_var_hidden;
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2018-08-24 09:34:30 +01:00
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}
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2019-02-06 07:24:51 +00:00
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nir_deref_instr *pixelmap_deref =
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nir_build_deref_var(b, state->pixelmap);
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2015-12-22 02:27:25 +00:00
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/* do four pixel map look-ups with two TEX instructions: */
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nir_ssa_def *def_xy, *def_zw;
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/* TEX def.xy, def.xyyy, pixelmap_sampler, 2D; */
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2019-02-06 07:24:51 +00:00
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tex = nir_tex_instr_create(state->shader, 3);
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2015-12-22 02:27:25 +00:00
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tex->op = nir_texop_tex;
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tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
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tex->coord_components = 2;
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tex->sampler_index = state->options->pixelmap_sampler;
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tex->texture_index = state->options->pixelmap_sampler;
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2020-12-08 12:45:55 +00:00
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tex->dest_type = nir_type_float32;
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2019-02-06 07:24:51 +00:00
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tex->src[0].src_type = nir_tex_src_texture_deref;
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tex->src[0].src = nir_src_for_ssa(&pixelmap_deref->dest.ssa);
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tex->src[1].src_type = nir_tex_src_sampler_deref;
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tex->src[1].src = nir_src_for_ssa(&pixelmap_deref->dest.ssa);
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tex->src[2].src_type = nir_tex_src_coord;
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tex->src[2].src = nir_src_for_ssa(nir_channels(b, def, 0x3));
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2015-12-22 02:27:25 +00:00
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nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
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nir_builder_instr_insert(b, &tex->instr);
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def_xy = &tex->dest.ssa;
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/* TEX def.zw, def.zwww, pixelmap_sampler, 2D; */
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tex = nir_tex_instr_create(state->shader, 1);
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tex->op = nir_texop_tex;
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tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
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tex->coord_components = 2;
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tex->sampler_index = state->options->pixelmap_sampler;
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2020-12-08 12:45:55 +00:00
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tex->dest_type = nir_type_float32;
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2016-11-03 23:28:49 +00:00
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tex->src[0].src_type = nir_tex_src_coord;
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2018-07-13 02:33:22 +01:00
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tex->src[0].src = nir_src_for_ssa(nir_channels(b, def, 0xc));
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2015-12-22 02:27:25 +00:00
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nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
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nir_builder_instr_insert(b, &tex->instr);
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def_zw = &tex->dest.ssa;
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/* def = vec4(def.xy, def.zw); */
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def = nir_vec4(b,
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nir_channel(b, def_xy, 0),
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nir_channel(b, def_xy, 1),
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nir_channel(b, def_zw, 0),
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nir_channel(b, def_zw, 1));
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}
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2021-03-03 06:13:38 +00:00
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nir_ssa_def_rewrite_uses(&intr->dest.ssa, def);
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2015-12-22 02:27:25 +00:00
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}
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static void
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lower_texcoord(lower_drawpixels_state *state, nir_intrinsic_instr *intr)
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{
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2016-08-19 23:38:08 +01:00
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state->b.cursor = nir_before_instr(&intr->instr);
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2015-12-22 02:27:25 +00:00
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nir_ssa_def *texcoord_const = get_texcoord_const(state);
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2021-03-03 06:13:38 +00:00
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nir_ssa_def_rewrite_uses(&intr->dest.ssa, texcoord_const);
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2015-12-22 02:27:25 +00:00
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}
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static bool
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lower_drawpixels_block(lower_drawpixels_state *state, nir_block *block)
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{
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nir_foreach_instr_safe(instr, block) {
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if (instr->type == nir_instr_type_intrinsic) {
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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2019-10-01 02:29:11 +01:00
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switch (intr->intrinsic) {
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case nir_intrinsic_load_deref: {
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2018-04-02 23:57:25 +01:00
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nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
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nir_variable *var = nir_deref_instr_get_variable(deref);
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if (var->data.location == VARYING_SLOT_COL0) {
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/* gl_Color should not have array/struct derefs: */
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assert(deref->deref_type == nir_deref_type_var);
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lower_color(state, intr);
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} else if (var->data.location == VARYING_SLOT_TEX0) {
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/* gl_TexCoord should not have array/struct derefs: */
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assert(deref->deref_type == nir_deref_type_var);
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lower_texcoord(state, intr);
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}
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2019-10-01 02:29:11 +01:00
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break;
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}
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case nir_intrinsic_load_color0:
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lower_color(state, intr);
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break;
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case nir_intrinsic_load_interpolated_input:
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case nir_intrinsic_load_input: {
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2020-08-14 06:54:19 +01:00
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if (nir_intrinsic_io_semantics(intr).location == VARYING_SLOT_TEX0)
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lower_texcoord(state, intr);
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2019-10-01 02:29:11 +01:00
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break;
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}
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default:
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break;
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2015-12-22 02:27:25 +00:00
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}
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}
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}
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return true;
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}
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static void
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lower_drawpixels_impl(lower_drawpixels_state *state, nir_function_impl *impl)
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{
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nir_builder_init(&state->b, impl);
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nir_foreach_block(block, impl) {
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lower_drawpixels_block(state, block);
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}
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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}
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void
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nir_lower_drawpixels(nir_shader *shader,
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const nir_lower_drawpixels_options *options)
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{
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lower_drawpixels_state state = {
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.options = options,
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.shader = shader,
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};
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2017-09-15 03:52:38 +01:00
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assert(shader->info.stage == MESA_SHADER_FRAGMENT);
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2015-12-22 02:27:25 +00:00
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nir_foreach_function(function, shader) {
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if (function->impl)
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lower_drawpixels_impl(&state, function->impl);
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}
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}
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