[Mesa-dev] [RFCv3 06/11] nir: add lowering pass for glDrawPixels
Rob Clark
robdclark at gmail.com
Sun Jan 31 12:16:14 PST 2016
From: Rob Clark <robclark at freedesktop.org>
Signed-off-by: Rob Clark <robclark at freedesktop.org>
---
src/compiler/Makefile.sources | 1 +
src/compiler/nir/nir.h | 13 ++
src/compiler/nir/nir_builder.h | 2 +-
src/compiler/nir/nir_lower_drawpixels.c | 252 ++++++++++++++++++++++++++++++++
4 files changed, 267 insertions(+), 1 deletion(-)
create mode 100644 src/compiler/nir/nir_lower_drawpixels.c
diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources
index 26c4c65..b2112d7 100644
--- a/src/compiler/Makefile.sources
+++ b/src/compiler/Makefile.sources
@@ -184,6 +184,7 @@ NIR_FILES = \
nir/nir_lower_alu_to_scalar.c \
nir/nir_lower_atomics.c \
nir/nir_lower_clip.c \
+ nir/nir_lower_drawpixels.c \
nir/nir_lower_global_vars_to_local.c \
nir/nir_lower_gs_intrinsics.c \
nir/nir_lower_load_const_to_scalar.c \
diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index a973a44..e2b10e9 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -2131,6 +2131,19 @@ typedef struct nir_lower_wpos_ytransform_options {
bool nir_lower_wpos_ytransform(nir_shader *shader,
const nir_lower_wpos_ytransform_options *options);
+typedef struct nir_lower_drawpixels_options {
+ int texcoord_state_tokens[5];
+ int scale_state_tokens[5];
+ int bias_state_tokens[5];
+ unsigned drawpix_sampler;
+ unsigned pixelmap_sampler;
+ bool pixel_maps :1;
+ bool scale_and_bias :1;
+} nir_lower_drawpixels_options;
+
+void nir_lower_drawpixels(nir_shader *shader,
+ const nir_lower_drawpixels_options *options);
+
void nir_lower_atomics(nir_shader *shader,
const struct gl_shader_program *shader_program);
void nir_lower_to_source_mods(nir_shader *shader);
diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_builder.h
index d546e41..8d53ccf 100644
--- a/src/compiler/nir/nir_builder.h
+++ b/src/compiler/nir/nir_builder.h
@@ -262,7 +262,7 @@ nir_imov_alu(nir_builder *build, nir_alu_src src, unsigned num_components)
* Construct an fmov or imov that reswizzles the source's components.
*/
static inline nir_ssa_def *
-nir_swizzle(nir_builder *build, nir_ssa_def *src, unsigned swiz[4],
+nir_swizzle(nir_builder *build, nir_ssa_def *src, const unsigned swiz[4],
unsigned num_components, bool use_fmov)
{
nir_alu_src alu_src = { NIR_SRC_INIT };
diff --git a/src/compiler/nir/nir_lower_drawpixels.c b/src/compiler/nir/nir_lower_drawpixels.c
new file mode 100644
index 0000000..6addf28
--- /dev/null
+++ b/src/compiler/nir/nir_lower_drawpixels.c
@@ -0,0 +1,252 @@
+/*
+ * Copyright © 2015 Red Hat
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "nir.h"
+#include "nir_builder.h"
+
+/* Lower glDrawPixels().
+ *
+ * This is based on the logic in st_get_drawpix_shader() in TGSI compiler.
+ *
+ * Run before nir_lower_io.
+ */
+
+typedef struct {
+ const nir_lower_drawpixels_options *options;
+ nir_shader *shader;
+ nir_builder b;
+ nir_variable *texcoord, *scale, *bias;
+} lower_drawpixels_state;
+
+static nir_ssa_def *
+get_texcoord(lower_drawpixels_state *state)
+{
+ if (state->texcoord == NULL) {
+ nir_variable *texcoord = NULL;
+
+ /* find gl_TexCoord, if it exists: */
+ nir_foreach_variable(var, &state->shader->inputs) {
+ if (strcmp(var->name, "gl_TexCoord") == 0) {
+ texcoord = var;
+ break;
+ }
+ }
+
+ /* otherwise create it: */
+ if (texcoord == NULL) {
+ texcoord = nir_variable_create(state->shader,
+ nir_var_shader_in,
+ glsl_vec4_type(),
+ "gl_TexCoord");
+ texcoord->data.location = VARYING_SLOT_TEX0;
+ }
+
+ state->texcoord = texcoord;
+ }
+ return nir_load_var(&state->b, state->texcoord);
+}
+
+static nir_variable *
+create_uniform(nir_shader *shader, const char *name, const int state_tokens[5])
+{
+ nir_variable *var = nir_variable_create(shader,
+ nir_var_uniform,
+ glsl_vec4_type(),
+ name);
+ var->num_state_slots = 1;
+ var->state_slots = ralloc_array(var, nir_state_slot, 1);
+ memcpy(var->state_slots[0].tokens, state_tokens,
+ sizeof(var->state_slots[0].tokens));
+ return var;
+}
+
+static nir_ssa_def *
+get_scale(lower_drawpixels_state *state)
+{
+ if (state->scale == NULL) {
+ state->scale = create_uniform(state->shader, "gl_PTscale",
+ state->options->scale_state_tokens);
+ }
+ return nir_load_var(&state->b, state->scale);
+}
+
+static nir_ssa_def *
+get_bias(lower_drawpixels_state *state)
+{
+ if (state->bias == NULL) {
+ state->bias = create_uniform(state->shader, "gl_PTbias",
+ state->options->bias_state_tokens);
+ }
+ return nir_load_var(&state->b, state->bias);
+}
+
+static nir_ssa_def *
+get_texcoord_const(lower_drawpixels_state *state)
+{
+ if (state->bias == NULL) {
+ state->bias = create_uniform(state->shader, "gl_MultiTexCoord0",
+ state->options->texcoord_state_tokens);
+ }
+ return nir_load_var(&state->b, state->bias);
+}
+
+static void
+lower_color(lower_drawpixels_state *state, nir_intrinsic_instr *intr)
+{
+ nir_builder *b = &state->b;
+ nir_ssa_def *texcoord;
+ nir_tex_instr *tex;
+ nir_ssa_def *def;
+
+ assert(intr->dest.is_ssa);
+
+ b->cursor = nir_before_instr(&intr->instr);
+
+ texcoord = get_texcoord(state);
+
+ /* replace load_var(gl_Color) w/ texture sample:
+ * TEX def, texcoord, drawpix_sampler, 2D
+ */
+ tex = nir_tex_instr_create(state->shader, 1);
+ tex->op = nir_texop_tex;
+ tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
+ tex->coord_components = 2;
+ tex->sampler_index = state->options->drawpix_sampler;
+ tex->dest_type = nir_type_float;
+ tex->src[0].src = nir_src_for_ssa(texcoord);
+
+ nir_ssa_dest_init(&tex->instr, &tex->dest, 4, NULL);
+ nir_builder_instr_insert(b, &tex->instr);
+ def = &tex->dest.ssa;
+
+ /* Apply the scale and bias. */
+ if (state->options->scale_and_bias) {
+ /* MAD def, def, scale, bias; */
+ def = nir_ffma(b, def, get_scale(state), get_bias(state));
+ }
+
+ if (state->options->pixel_maps) {
+ static const unsigned swiz_xy[4] = {0,1};
+ static const unsigned swiz_zw[4] = {2,3};
+
+ /* do four pixel map look-ups with two TEX instructions: */
+ nir_ssa_def *def_xy, *def_zw;
+
+ /* TEX def.xy, def.xyyy, pixelmap_sampler, 2D; */
+ tex = nir_tex_instr_create(state->shader, 1);
+ tex->op = nir_texop_tex;
+ tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
+ tex->coord_components = 2;
+ tex->sampler_index = state->options->pixelmap_sampler;
+ tex->dest_type = nir_type_float;
+ tex->src[0].src = nir_src_for_ssa(nir_swizzle(b, def, swiz_xy, 2, true));
+
+ nir_ssa_dest_init(&tex->instr, &tex->dest, 4, NULL);
+ nir_builder_instr_insert(b, &tex->instr);
+ def_xy = &tex->dest.ssa;
+
+ /* TEX def.zw, def.zwww, pixelmap_sampler, 2D; */
+ tex = nir_tex_instr_create(state->shader, 1);
+ tex->op = nir_texop_tex;
+ tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
+ tex->coord_components = 2;
+ tex->sampler_index = state->options->pixelmap_sampler;
+ tex->dest_type = nir_type_float;
+ tex->src[0].src = nir_src_for_ssa(nir_swizzle(b, def, swiz_zw, 2, true));
+
+ nir_ssa_dest_init(&tex->instr, &tex->dest, 4, NULL);
+ nir_builder_instr_insert(b, &tex->instr);
+ def_zw = &tex->dest.ssa;
+
+ /* def = vec4(def.xy, def.zw); */
+ def = nir_vec4(b,
+ nir_channel(b, def_xy, 0),
+ nir_channel(b, def_xy, 1),
+ nir_channel(b, def_zw, 0),
+ nir_channel(b, def_zw, 1));
+ }
+
+ nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(def));
+}
+
+static void
+lower_texcoord(lower_drawpixels_state *state, nir_intrinsic_instr *intr)
+{
+ nir_ssa_def *texcoord_const = get_texcoord_const(state);
+ nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(texcoord_const));
+}
+
+static bool
+lower_drawpixels_block(nir_block *block, void *_state)
+{
+ lower_drawpixels_state *state = _state;
+
+ nir_foreach_instr_safe(block, instr) {
+ if (instr->type == nir_instr_type_intrinsic) {
+ nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
+ if (intr->intrinsic == nir_intrinsic_load_var) {
+ nir_deref_var *dvar = intr->variables[0];
+ nir_variable *var = dvar->var;
+
+ if (strcmp(var->name, "gl_Color") == 0) {
+ /* gl_FragCoord should not have array/struct deref's: */
+ assert(dvar->deref.child == NULL);
+ lower_color(state, intr);
+ } else if (strcmp(var->name, "gl_TexCoord") == 0) {
+ /* gl_TexCoord should not have array/struct deref's: */
+ assert(dvar->deref.child == NULL);
+ lower_texcoord(state, intr);
+ }
+ }
+ }
+ }
+
+ return true;
+}
+
+static void
+lower_drawpixels_impl(lower_drawpixels_state *state, nir_function_impl *impl)
+{
+ nir_builder_init(&state->b, impl);
+
+ nir_foreach_block(impl, lower_drawpixels_block, state);
+ nir_metadata_preserve(impl, nir_metadata_block_index |
+ nir_metadata_dominance);
+}
+
+void
+nir_lower_drawpixels(nir_shader *shader,
+ const nir_lower_drawpixels_options *options)
+{
+ lower_drawpixels_state state = {
+ .options = options,
+ .shader = shader,
+ };
+
+ assert(shader->stage == MESA_SHADER_FRAGMENT);
+
+ nir_foreach_function(shader, function) {
+ if (function->impl)
+ lower_drawpixels_impl(&state, function->impl);
+ }
+}
--
2.5.0
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