2 * Copyright © 2015 Red Hat
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
25 #include "nir_builder.h"
27 /* Lower glDrawPixels().
29 * This is based on the logic in st_get_drawpix_shader() in TGSI compiler.
31 * Run before nir_lower_io.
35 const nir_lower_drawpixels_options
*options
;
38 nir_variable
*texcoord
, *scale
, *bias
;
39 } lower_drawpixels_state
;
42 get_texcoord(lower_drawpixels_state
*state
)
44 if (state
->texcoord
== NULL
) {
45 nir_variable
*texcoord
= NULL
;
47 /* find gl_TexCoord, if it exists: */
48 nir_foreach_variable(var
, &state
->shader
->inputs
) {
49 if (var
->data
.location
== VARYING_SLOT_TEX0
) {
55 /* otherwise create it: */
56 if (texcoord
== NULL
) {
57 texcoord
= nir_variable_create(state
->shader
,
61 texcoord
->data
.location
= VARYING_SLOT_TEX0
;
64 state
->texcoord
= texcoord
;
66 return nir_load_var(&state
->b
, state
->texcoord
);
70 create_uniform(nir_shader
*shader
, const char *name
, const int state_tokens
[5])
72 nir_variable
*var
= nir_variable_create(shader
,
76 var
->num_state_slots
= 1;
77 var
->state_slots
= ralloc_array(var
, nir_state_slot
, 1);
78 memcpy(var
->state_slots
[0].tokens
, state_tokens
,
79 sizeof(var
->state_slots
[0].tokens
));
84 get_scale(lower_drawpixels_state
*state
)
86 if (state
->scale
== NULL
) {
87 state
->scale
= create_uniform(state
->shader
, "gl_PTscale",
88 state
->options
->scale_state_tokens
);
90 return nir_load_var(&state
->b
, state
->scale
);
94 get_bias(lower_drawpixels_state
*state
)
96 if (state
->bias
== NULL
) {
97 state
->bias
= create_uniform(state
->shader
, "gl_PTbias",
98 state
->options
->bias_state_tokens
);
100 return nir_load_var(&state
->b
, state
->bias
);
104 get_texcoord_const(lower_drawpixels_state
*state
)
106 if (state
->bias
== NULL
) {
107 state
->bias
= create_uniform(state
->shader
, "gl_MultiTexCoord0",
108 state
->options
->texcoord_state_tokens
);
110 return nir_load_var(&state
->b
, state
->bias
);
114 lower_color(lower_drawpixels_state
*state
, nir_intrinsic_instr
*intr
)
116 nir_builder
*b
= &state
->b
;
117 nir_ssa_def
*texcoord
;
121 assert(intr
->dest
.is_ssa
);
123 b
->cursor
= nir_before_instr(&intr
->instr
);
125 texcoord
= get_texcoord(state
);
127 /* replace load_var(gl_Color) w/ texture sample:
128 * TEX def, texcoord, drawpix_sampler, 2D
130 tex
= nir_tex_instr_create(state
->shader
, 1);
131 tex
->op
= nir_texop_tex
;
132 tex
->sampler_dim
= GLSL_SAMPLER_DIM_2D
;
133 tex
->coord_components
= 2;
134 tex
->sampler_index
= state
->options
->drawpix_sampler
;
135 tex
->texture_index
= state
->options
->drawpix_sampler
;
136 tex
->dest_type
= nir_type_float
;
137 tex
->src
[0].src
= nir_src_for_ssa(texcoord
);
139 nir_ssa_dest_init(&tex
->instr
, &tex
->dest
, 4, 32, NULL
);
140 nir_builder_instr_insert(b
, &tex
->instr
);
141 def
= &tex
->dest
.ssa
;
143 /* Apply the scale and bias. */
144 if (state
->options
->scale_and_bias
) {
145 /* MAD def, def, scale, bias; */
146 def
= nir_ffma(b
, def
, get_scale(state
), get_bias(state
));
149 if (state
->options
->pixel_maps
) {
150 static const unsigned swiz_xy
[4] = {0,1};
151 static const unsigned swiz_zw
[4] = {2,3};
153 /* do four pixel map look-ups with two TEX instructions: */
154 nir_ssa_def
*def_xy
, *def_zw
;
156 /* TEX def.xy, def.xyyy, pixelmap_sampler, 2D; */
157 tex
= nir_tex_instr_create(state
->shader
, 1);
158 tex
->op
= nir_texop_tex
;
159 tex
->sampler_dim
= GLSL_SAMPLER_DIM_2D
;
160 tex
->coord_components
= 2;
161 tex
->sampler_index
= state
->options
->pixelmap_sampler
;
162 tex
->texture_index
= state
->options
->pixelmap_sampler
;
163 tex
->dest_type
= nir_type_float
;
164 tex
->src
[0].src
= nir_src_for_ssa(nir_swizzle(b
, def
, swiz_xy
, 2, true));
166 nir_ssa_dest_init(&tex
->instr
, &tex
->dest
, 4, 32, NULL
);
167 nir_builder_instr_insert(b
, &tex
->instr
);
168 def_xy
= &tex
->dest
.ssa
;
170 /* TEX def.zw, def.zwww, pixelmap_sampler, 2D; */
171 tex
= nir_tex_instr_create(state
->shader
, 1);
172 tex
->op
= nir_texop_tex
;
173 tex
->sampler_dim
= GLSL_SAMPLER_DIM_2D
;
174 tex
->coord_components
= 2;
175 tex
->sampler_index
= state
->options
->pixelmap_sampler
;
176 tex
->dest_type
= nir_type_float
;
177 tex
->src
[0].src
= nir_src_for_ssa(nir_swizzle(b
, def
, swiz_zw
, 2, true));
179 nir_ssa_dest_init(&tex
->instr
, &tex
->dest
, 4, 32, NULL
);
180 nir_builder_instr_insert(b
, &tex
->instr
);
181 def_zw
= &tex
->dest
.ssa
;
183 /* def = vec4(def.xy, def.zw); */
185 nir_channel(b
, def_xy
, 0),
186 nir_channel(b
, def_xy
, 1),
187 nir_channel(b
, def_zw
, 0),
188 nir_channel(b
, def_zw
, 1));
191 nir_ssa_def_rewrite_uses(&intr
->dest
.ssa
, nir_src_for_ssa(def
));
195 lower_texcoord(lower_drawpixels_state
*state
, nir_intrinsic_instr
*intr
)
197 nir_ssa_def
*texcoord_const
= get_texcoord_const(state
);
198 nir_ssa_def_rewrite_uses(&intr
->dest
.ssa
, nir_src_for_ssa(texcoord_const
));
202 lower_drawpixels_block(lower_drawpixels_state
*state
, nir_block
*block
)
204 nir_foreach_instr_safe(instr
, block
) {
205 if (instr
->type
== nir_instr_type_intrinsic
) {
206 nir_intrinsic_instr
*intr
= nir_instr_as_intrinsic(instr
);
207 if (intr
->intrinsic
== nir_intrinsic_load_var
) {
208 nir_deref_var
*dvar
= intr
->variables
[0];
209 nir_variable
*var
= dvar
->var
;
211 if (var
->data
.location
== VARYING_SLOT_COL0
) {
212 /* gl_Color should not have array/struct deref's: */
213 assert(dvar
->deref
.child
== NULL
);
214 lower_color(state
, intr
);
215 } else if (var
->data
.location
== VARYING_SLOT_TEX0
) {
216 /* gl_TexCoord should not have array/struct deref's: */
217 assert(dvar
->deref
.child
== NULL
);
218 lower_texcoord(state
, intr
);
228 lower_drawpixels_impl(lower_drawpixels_state
*state
, nir_function_impl
*impl
)
230 nir_builder_init(&state
->b
, impl
);
232 nir_foreach_block(block
, impl
) {
233 lower_drawpixels_block(state
, block
);
235 nir_metadata_preserve(impl
, nir_metadata_block_index
|
236 nir_metadata_dominance
);
240 nir_lower_drawpixels(nir_shader
*shader
,
241 const nir_lower_drawpixels_options
*options
)
243 lower_drawpixels_state state
= {
248 assert(shader
->stage
== MESA_SHADER_FRAGMENT
);
250 nir_foreach_function(function
, shader
) {
252 lower_drawpixels_impl(&state
, function
->impl
);