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/*
* © Copyright 2018 Alyssa Rosenzweig
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pan_context.h"
#include "compiler/nir/nir.h"
#include "nir/tgsi_to_nir.h"
#include "midgard/midgard_compile.h"
#include "util/u_dynarray.h"
#include "tgsi/tgsi_dump.h"
void
panfrost_shader_compile(struct panfrost_context *ctx, struct mali_shader_meta *meta, const char *src, int type, struct panfrost_shader_state *state)
{
uint8_t *dst;
nir_shader *s;
struct pipe_shader_state *cso = state->base;
if (cso->type == PIPE_SHADER_IR_NIR) {
s = nir_shader_clone(NULL, cso->ir.nir);
} else {
assert (cso->type == PIPE_SHADER_IR_TGSI);
//tgsi_dump(cso->tokens, 0);
s = tgsi_to_nir(cso->tokens, &ctx->base.screen);
}
s->info.stage = type == JOB_TYPE_VERTEX ? MESA_SHADER_VERTEX : MESA_SHADER_FRAGMENT;
if (s->info.stage == MESA_SHADER_FRAGMENT) {
/* Inject the alpha test now if we need to */
if (state->alpha_state.enabled) {
NIR_PASS_V(s, nir_lower_alpha_test, state->alpha_state.func, false);
}
}
/* Call out to Midgard compiler given the above NIR */
midgard_program program = {
.alpha_ref = state->alpha_state.ref_value
};
midgard_compile_shader_nir(s, &program, false);
/* Prepare the compiled binary for upload */
int size = program.compiled.size;
dst = program.compiled.data;
/* Upload the shader. The lookahead tag is ORed on as a tagged pointer.
* I bet someone just thought that would be a cute pun. At least,
* that's how I'd do it. */
meta->shader = panfrost_upload(&ctx->shaders, dst, size, true) | program.first_tag;
util_dynarray_fini(&program.compiled);
meta->midgard1.uniform_count = MIN2(program.uniform_count, program.uniform_cutoff);
meta->attribute_count = program.attribute_count;
meta->varying_count = program.varying_count;
meta->midgard1.work_count = program.work_register_count;
state->can_discard = program.can_discard;
state->writes_point_size = program.writes_point_size;
/* Separate as primary uniform count is truncated */
state->uniform_count = program.uniform_count;
/* gl_Position eats up an extra spot */
if (type == JOB_TYPE_VERTEX)
meta->varying_count += 1;
/* Note: gl_FragCoord does -not- eat an extra spot; it will be included
* in our count if we need it */
meta->midgard1.unknown2 = 8; /* XXX */
/* Varyings are known only through the shader. We choose to upload this
* information with the vertex shader, though the choice is perhaps
* arbitrary */
if (type == JOB_TYPE_VERTEX) {
struct panfrost_varyings *varyings = &state->varyings;
/* Measured in vec4 words. Don't include gl_Position */
int varying_count = program.varying_count;
/* Setup two buffers, one for position, the other for normal
* varyings, as seen in traces. TODO: Are there other
* configurations we might use? */
varyings->varying_buffer_count = 2;
/* mediump vec4s sequentially */
varyings->varyings_stride[0] = (2 * sizeof(float)) * varying_count;
/* highp gl_Position */
varyings->varyings_stride[1] = 4 * sizeof(float);
/* mediump gl_PointSize */
if (program.writes_point_size) {
++varyings->varying_buffer_count;
varyings->varyings_stride[2] = 2; /* sizeof(fp16) */
}
/* Setup gl_Position, its weirdo analogue, and gl_PointSize (optionally) */
unsigned default_vec1_swizzle = panfrost_get_default_swizzle(1);
unsigned default_vec4_swizzle = panfrost_get_default_swizzle(4);
struct mali_attr_meta vertex_special_varyings[] = {
{
.index = 1,
.format = MALI_VARYING_POS,
.swizzle = default_vec4_swizzle,
.unknown1 = 0x2,
},
{
.index = 1,
.format = MALI_RGBA16F,
/* TODO: Wat? yyyy swizzle? */
.swizzle = 0x249,
.unknown1 = 0x0,
},
{
.index = 2,
.format = MALI_R16F,
.swizzle = default_vec1_swizzle,
.unknown1 = 0x2
}
};
/* How many special vertex varyings are actually required? */
int vertex_special_count = 2 + (program.writes_point_size ? 1 : 0);
/* Setup actual varyings. XXX: Don't assume vec4 */
struct mali_attr_meta mali_varyings[PIPE_MAX_ATTRIBS];
for (int i = 0; i < varying_count; ++i) {
struct mali_attr_meta vec4_varying_meta = {
.index = 0,
.format = MALI_RGBA16F,
.swizzle = default_vec4_swizzle,
.unknown1 = 0x2,
/* Set offset to keep everything back-to-back in
* the same buffer */
.src_offset = 8 * i,
};
mali_varyings[i] = vec4_varying_meta;
}
/* We don't count the weirdo gl_Position in our varying count */
varyings->varying_count = varying_count - 1;
/* In this context, position_meta represents the implicit
* gl_FragCoord varying. So, upload all the varyings */
unsigned varyings_size = sizeof(struct mali_attr_meta) * varyings->varying_count;
unsigned vertex_special_size = sizeof(struct mali_attr_meta) * vertex_special_count;
unsigned vertex_size = vertex_special_size + varyings_size;
unsigned fragment_size = varyings_size + sizeof(struct mali_attr_meta);
struct panfrost_transfer transfer = panfrost_allocate_chunk(ctx, vertex_size + fragment_size, HEAP_DESCRIPTOR);
/* Copy varyings in the follow order:
* - Position 1, 2
* - Varyings 1, 2, ..., n
* - Varyings 1, 2, ..., n (duplicate)
* - Position 1
*/
memcpy(transfer.cpu, vertex_special_varyings, vertex_special_size);
memcpy(transfer.cpu + vertex_special_size, mali_varyings, varyings_size);
memcpy(transfer.cpu + vertex_size, mali_varyings, varyings_size);
memcpy(transfer.cpu + vertex_size + varyings_size, &vertex_special_varyings[0], sizeof(struct mali_attr_meta));
/* Point to the descriptor */
varyings->varyings_buffer_cpu = transfer.cpu;
varyings->varyings_descriptor = transfer.gpu;
varyings->varyings_descriptor_fragment = transfer.gpu + vertex_size;
}
}
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