[Mesa-dev] [PATCH 08/37] glsl: add initial implementation of shader cache
Timothy Arceri
t_arceri at yahoo.com.au
Mon Jan 23 23:12:47 UTC 2017
From: Timothy Arceri <timothy.arceri at collabora.com>
This uses disk_cache.c to write out a serialization of various
state that's required in order to successfully load and use a
binary written out by a drivers backend, this state is referred to as
"metadata" throughout the implementation.
This initial version is intended to work with vertex and fragment
shader stages only.
This patch is based on the initial work done by Carl.
---
src/compiler/Makefile.glsl.am | 3 +-
src/compiler/Makefile.sources | 4 +
src/compiler/glsl/shader_cache.cpp | 565 +++++++++++++++++++++++++++++++++++++
src/compiler/glsl/shader_cache.h | 38 +++
4 files changed, 609 insertions(+), 1 deletion(-)
create mode 100644 src/compiler/glsl/shader_cache.cpp
create mode 100644 src/compiler/glsl/shader_cache.h
diff --git a/src/compiler/Makefile.glsl.am b/src/compiler/Makefile.glsl.am
index f673196..41edb3c 100644
--- a/src/compiler/Makefile.glsl.am
+++ b/src/compiler/Makefile.glsl.am
@@ -131,7 +131,8 @@ glsl_libglsl_la_LIBADD = \
glsl_libglsl_la_SOURCES = \
$(LIBGLSL_GENERATED_FILES) \
- $(LIBGLSL_FILES)
+ $(LIBGLSL_FILES) \
+ $(LIBGLSL_SHADER_CACHE_FILES)
glsl_libstandalone_la_SOURCES = \
$(GLSL_COMPILER_CXX_FILES)
diff --git a/src/compiler/Makefile.sources b/src/compiler/Makefile.sources
index a8bb4d3..1e8edc0 100644
--- a/src/compiler/Makefile.sources
+++ b/src/compiler/Makefile.sources
@@ -142,6 +142,10 @@ LIBGLSL_FILES = \
glsl/s_expression.cpp \
glsl/s_expression.h
+LIBGLSL_SHADER_CACHE_FILES = \
+ glsl/shader_cache.cpp \
+ glsl/shader_cache.h
+
# glsl_compiler
GLSL_COMPILER_CXX_FILES = \
diff --git a/src/compiler/glsl/shader_cache.cpp b/src/compiler/glsl/shader_cache.cpp
new file mode 100644
index 0000000..acb089c
--- /dev/null
+++ b/src/compiler/glsl/shader_cache.cpp
@@ -0,0 +1,565 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * 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.
+ */
+
+/**
+ * \file shader_cache.c
+ *
+ * GLSL shader cache implementation
+ *
+ * This uses the generic cache in cache.c to implement a cache of linked
+ * shader programs.
+ */
+
+#include "blob.h"
+#include "compiler/shader_info.h"
+#include "glsl_symbol_table.h"
+#include "glsl_parser_extras.h"
+#include "ir.h"
+#include "ir_optimization.h"
+#include "ir_rvalue_visitor.h"
+#include "ir_uniform.h"
+#include "linker.h"
+#include "link_varyings.h"
+#include "main/core.h"
+#include "nir.h"
+#include "program.h"
+#include "util/disk_cache.h"
+#include "util/mesa-sha1.h"
+#include "util/string_to_uint_map.h"
+
+extern "C" {
+#include "main/enums.h"
+#include "main/shaderobj.h"
+#include "program/program.h"
+}
+
+static void
+compile_shaders(struct gl_context *ctx, struct gl_shader_program *prog) {
+ for (unsigned i = 0; i < prog->NumShaders; i++) {
+ _mesa_glsl_compile_shader(ctx, prog->Shaders[i], false, false, true);
+ }
+}
+
+static void
+encode_type_to_blob(struct blob *blob, const glsl_type *type)
+{
+ uint32_t encoding;
+
+ switch (type->base_type) {
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ case GLSL_TYPE_FLOAT:
+ case GLSL_TYPE_BOOL:
+ case GLSL_TYPE_DOUBLE:
+ encoding = (type->base_type << 24) |
+ (type->vector_elements << 4) |
+ (type->matrix_columns);
+ break;
+ case GLSL_TYPE_SAMPLER:
+ encoding = (type->base_type) << 24 |
+ (type->sampler_dimensionality << 4) |
+ (type->sampler_shadow << 3) |
+ (type->sampler_array << 2) |
+ (type->sampled_type);
+ break;
+ case GLSL_TYPE_SUBROUTINE:
+ encoding = type->base_type << 24;
+ blob_write_uint32(blob, encoding);
+ blob_write_string(blob, type->name);
+ return;
+ case GLSL_TYPE_IMAGE:
+ encoding = (type->base_type) << 24 |
+ (type->sampler_dimensionality << 3) |
+ (type->sampler_array << 2) |
+ (type->sampled_type);
+ break;
+ case GLSL_TYPE_ATOMIC_UINT:
+ encoding = (type->base_type << 24);
+ break;
+ case GLSL_TYPE_ARRAY:
+ blob_write_uint32(blob, (type->base_type) << 24);
+ blob_write_uint32(blob, type->length);
+ encode_type_to_blob(blob, type->fields.array);
+ return;
+ case GLSL_TYPE_STRUCT:
+ case GLSL_TYPE_INTERFACE:
+ blob_write_uint32(blob, (type->base_type) << 24);
+ blob_write_string(blob, type->name);
+ blob_write_uint32(blob, type->length);
+ blob_write_bytes(blob, type->fields.structure,
+ sizeof(glsl_struct_field) * type->length);
+ for (unsigned i = 0; i < type->length; i++) {
+ encode_type_to_blob(blob, type->fields.structure[i].type);
+ blob_write_string(blob, type->fields.structure[i].name);
+ }
+
+ if (type->base_type == GLSL_TYPE_INTERFACE) {
+ blob_write_uint32(blob, type->interface_packing);
+ blob_write_uint32(blob, type->interface_row_major);
+ }
+ return;
+ case GLSL_TYPE_VOID:
+ case GLSL_TYPE_ERROR:
+ default:
+ assert(!"Cannot encode type!");
+ encoding = 0;
+ break;
+ }
+
+ blob_write_uint32(blob, encoding);
+}
+
+static const glsl_type *
+decode_type_from_blob(struct blob_reader *blob)
+{
+ uint32_t u = blob_read_uint32(blob);
+ glsl_base_type base_type = (glsl_base_type) (u >> 24);
+
+ switch (base_type) {
+ case GLSL_TYPE_UINT:
+ case GLSL_TYPE_INT:
+ case GLSL_TYPE_FLOAT:
+ case GLSL_TYPE_BOOL:
+ case GLSL_TYPE_DOUBLE:
+ return glsl_type::get_instance(base_type, (u >> 4) & 0x0f, u & 0x0f);
+ case GLSL_TYPE_SAMPLER:
+ return glsl_type::get_sampler_instance((enum glsl_sampler_dim) ((u >> 4) & 0x07),
+ (u >> 3) & 0x01,
+ (u >> 2) & 0x01,
+ (glsl_base_type) ((u >> 0) & 0x03));
+ case GLSL_TYPE_SUBROUTINE:
+ return glsl_type::get_subroutine_instance(blob_read_string(blob));
+ case GLSL_TYPE_IMAGE:
+ return glsl_type::get_image_instance((enum glsl_sampler_dim) ((u >> 3) & 0x07),
+ (u >> 2) & 0x01,
+ (glsl_base_type) ((u >> 0) & 0x03));
+ case GLSL_TYPE_ATOMIC_UINT:
+ return glsl_type::atomic_uint_type;
+ case GLSL_TYPE_ARRAY: {
+ unsigned length = blob_read_uint32(blob);
+ return glsl_type::get_array_instance(decode_type_from_blob(blob),
+ length);
+ }
+ case GLSL_TYPE_STRUCT:
+ case GLSL_TYPE_INTERFACE: {
+ char *name = blob_read_string(blob);
+ unsigned num_fields = blob_read_uint32(blob);
+ glsl_struct_field *fields = (glsl_struct_field *)
+ blob_read_bytes(blob, sizeof(glsl_struct_field) * num_fields);
+ for (unsigned i = 0; i < num_fields; i++) {
+ fields[i].type = decode_type_from_blob(blob);
+ fields[i].name = blob_read_string(blob);
+ }
+
+ if (base_type == GLSL_TYPE_INTERFACE) {
+ enum glsl_interface_packing packing =
+ (glsl_interface_packing) blob_read_uint32(blob);
+ bool row_major = blob_read_uint32(blob);
+ return glsl_type::get_interface_instance(fields, num_fields,
+ packing, row_major, name);
+ } else {
+ return glsl_type::get_record_instance(fields, num_fields, name);
+ }
+ }
+ case GLSL_TYPE_VOID:
+ case GLSL_TYPE_ERROR:
+ default:
+ assert(!"Cannot decode type!");
+ return NULL;
+ }
+}
+
+static void
+write_uniforms(struct blob *metadata, struct gl_shader_program *prog)
+{
+ blob_write_uint32(metadata, prog->SamplersValidated);
+ blob_write_uint32(metadata, prog->data->NumUniformStorage);
+ blob_write_uint32(metadata, prog->data->NumUniformDataSlots);
+
+ for (unsigned i = 0; i < prog->data->NumUniformStorage; i++) {
+ encode_type_to_blob(metadata, prog->data->UniformStorage[i].type);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].array_elements);
+ blob_write_string(metadata, prog->data->UniformStorage[i].name);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].storage -
+ prog->data->UniformDataSlots);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].remap_location);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].block_index);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].atomic_buffer_index);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].offset);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].array_stride);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].matrix_stride);
+ blob_write_uint32(metadata, prog->data->UniformStorage[i].row_major);
+ blob_write_uint32(metadata,
+ prog->data->UniformStorage[i].num_compatible_subroutines);
+ blob_write_uint32(metadata,
+ prog->data->UniformStorage[i].top_level_array_size);
+ blob_write_uint32(metadata,
+ prog->data->UniformStorage[i].top_level_array_stride);
+ }
+}
+
+static void
+read_uniforms(struct blob_reader *metadata, struct gl_shader_program *prog)
+{
+ struct gl_uniform_storage *uniforms;
+ union gl_constant_value *data;
+
+ prog->SamplersValidated = blob_read_uint32(metadata);
+ prog->data->NumUniformStorage = blob_read_uint32(metadata);
+ prog->data->NumUniformDataSlots = blob_read_uint32(metadata);
+
+ uniforms = rzalloc_array(prog, struct gl_uniform_storage,
+ prog->data->NumUniformStorage);
+ prog->data->UniformStorage = uniforms;
+
+ data = rzalloc_array(uniforms, union gl_constant_value,
+ prog->data->NumUniformDataSlots);
+ prog->data->UniformDataSlots = data;
+
+ prog->UniformHash = new string_to_uint_map;
+
+ for (unsigned i = 0; i < prog->data->NumUniformStorage; i++) {
+ uniforms[i].type = decode_type_from_blob(metadata);
+ uniforms[i].array_elements = blob_read_uint32(metadata);
+ uniforms[i].name = ralloc_strdup(prog, blob_read_string (metadata));
+ uniforms[i].storage = data + blob_read_uint32(metadata);
+ uniforms[i].remap_location = blob_read_uint32(metadata);
+ uniforms[i].block_index = blob_read_uint32(metadata);
+ uniforms[i].atomic_buffer_index = blob_read_uint32(metadata);
+ uniforms[i].offset = blob_read_uint32(metadata);
+ uniforms[i].array_stride = blob_read_uint32(metadata);
+ uniforms[i].matrix_stride = blob_read_uint32(metadata);
+ uniforms[i].row_major = blob_read_uint32(metadata);
+ uniforms[i].num_compatible_subroutines = blob_read_uint32(metadata);
+ uniforms[i].top_level_array_size = blob_read_uint32(metadata);
+ uniforms[i].top_level_array_stride = blob_read_uint32(metadata);
+ prog->UniformHash->put(i, uniforms[i].name);
+ }
+}
+
+
+static void
+write_uniform_remap_table(struct blob *metadata,
+ struct gl_shader_program *prog)
+{
+ blob_write_uint32(metadata, prog->NumUniformRemapTable);
+
+ for (unsigned i = 0; i < prog->NumUniformRemapTable; i++) {
+ blob_write_uint32(metadata, prog->UniformRemapTable[i] -
+ prog->data->UniformStorage);
+ }
+}
+
+static void
+read_uniform_remap_table(struct blob_reader *metadata,
+ struct gl_shader_program *prog)
+{
+ prog->NumUniformRemapTable = blob_read_uint32(metadata);
+
+ prog->UniformRemapTable =rzalloc_array(prog, struct gl_uniform_storage *,
+ prog->NumUniformRemapTable);
+
+ for (unsigned i = 0; i < prog->NumUniformRemapTable; i++) {
+ prog->UniformRemapTable[i] =
+ prog->data->UniformStorage + blob_read_uint32(metadata);
+ }
+}
+
+static void
+write_shader_parameters(struct blob *metadata,
+ struct gl_program_parameter_list *params)
+{
+ blob_write_uint32(metadata, params->NumParameters);
+
+ for (unsigned i = 0; i < params->NumParameters; i++) {
+ struct gl_program_parameter *param = ¶ms->Parameters[i];
+
+ blob_write_uint32(metadata, param->Type);
+ blob_write_string(metadata, param->Name);
+ blob_write_uint32(metadata, param->Size);
+ blob_write_uint32(metadata, param->DataType);
+ blob_write_bytes(metadata, param->StateIndexes,
+ sizeof(param->StateIndexes));
+ }
+
+ blob_write_uint32(metadata, params->StateFlags);
+}
+
+static void
+read_shader_parameters(struct blob_reader *metadata,
+ struct gl_program_parameter_list *params)
+{
+ const char *name;
+ gl_register_file type;
+ GLuint size;
+ GLenum data_type;
+ gl_state_index state_indexes[STATE_LENGTH];
+
+ uint32_t num_parameters = blob_read_uint32(metadata);
+
+ for (uint32_t i = 0; i < num_parameters; i++) {
+
+ type = (gl_register_file) blob_read_uint32(metadata);
+ name = blob_read_string(metadata);
+ size = blob_read_uint32(metadata);
+ data_type = blob_read_uint32(metadata);
+ blob_copy_bytes(metadata, (uint8_t *) state_indexes,
+ sizeof(state_indexes));
+
+ _mesa_add_parameter(params, type, name, size, data_type,
+ NULL, state_indexes);
+ }
+
+ params->StateFlags = blob_read_uint32(metadata);
+}
+
+static void
+write_shader_metadata(struct blob *metadata, gl_linked_shader *shader)
+{
+ assert(shader->Program);
+ struct gl_program *glprog = shader->Program;
+
+ blob_write_bytes(metadata, glprog->TexturesUsed,
+ sizeof(glprog->TexturesUsed));
+ blob_write_uint64(metadata, glprog->SamplersUsed);
+
+ write_shader_parameters(metadata, glprog->Parameters);
+}
+
+static void
+read_shader_metadata(struct blob_reader *metadata,
+ struct gl_program *glprog,
+ gl_linked_shader *linked)
+{
+ blob_copy_bytes(metadata, (uint8_t *) glprog->TexturesUsed,
+ sizeof(glprog->TexturesUsed));
+ glprog->SamplersUsed = blob_read_uint64(metadata);
+
+ glprog->Parameters = _mesa_new_parameter_list();
+ read_shader_parameters(metadata, glprog->Parameters);
+}
+
+static void
+create_binding_str(const char *key, unsigned value, void *closure)
+{
+ char **bindings_str = (char **) closure;
+ ralloc_asprintf_append(bindings_str, "%s:%u,", key, value);
+}
+
+static void
+create_linked_shader_and_program(struct gl_context *ctx,
+ gl_shader_stage stage,
+ struct gl_shader_program *prog,
+ struct blob_reader *metadata)
+{
+ struct gl_program *glprog;
+
+ struct gl_linked_shader *linked = rzalloc(NULL, struct gl_linked_shader);
+ linked->Stage = stage;
+
+ glprog = ctx->Driver.NewProgram(ctx, _mesa_shader_stage_to_program(stage),
+ prog->Name, false);
+ glprog->info.stage = stage;
+ linked->Program = glprog;
+
+ read_shader_metadata(metadata, glprog, linked);
+
+ /* Restore shader info */
+ blob_copy_bytes(metadata, (uint8_t *) &glprog->info, sizeof(shader_info));
+ glprog->info.name = ralloc_strdup(glprog, blob_read_string(metadata));
+ if (glprog->info.label) {
+ glprog->info.label = ralloc_strdup(glprog, blob_read_string(metadata));
+ }
+
+ _mesa_reference_shader_program_data(ctx, &glprog->sh.data, prog->data);
+ _mesa_reference_program(ctx, &linked->Program, glprog);
+ prog->_LinkedShaders[stage] = linked;
+}
+
+void
+shader_cache_write_program_metadata(struct gl_context *ctx,
+ struct gl_shader_program *prog)
+{
+ struct disk_cache *cache = ctx->Cache;
+ if (!cache)
+ return;
+
+ /* Currently we don't support caching compute shaders. */
+ if (prog->_LinkedShaders[MESA_SHADER_COMPUTE])
+ return;
+
+ struct blob *metadata = blob_create(NULL);
+
+ write_uniforms(metadata, prog);
+
+ blob_write_uint32(metadata, prog->data->linked_stages);
+
+ for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
+ struct gl_linked_shader *sh = prog->_LinkedShaders[i];
+ if (sh) {
+ write_shader_metadata(metadata, sh);
+
+ /* Store nir shader info */
+ blob_write_bytes(metadata, &sh->Program->info, sizeof(shader_info));
+
+ blob_write_string(metadata, sh->Program->info.name);
+
+ if (sh->Program->info.label) {
+ blob_write_string(metadata, sh->Program->info.label);
+ }
+ }
+ }
+
+ write_uniform_remap_table(metadata, prog);
+
+ char sha1_buf[41];
+ for (unsigned i = 0; i < prog->NumShaders; i++) {
+ disk_cache_put_key(cache, prog->Shaders[i]->sha1);
+ if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
+ fprintf(stderr, "marking shader: %s\n",
+ _mesa_sha1_format(sha1_buf, prog->Shaders[i]->sha1));
+ }
+ }
+
+ disk_cache_put(cache, prog->data->sha1, metadata->data, metadata->size);
+
+ ralloc_free(metadata);
+
+ if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
+ fprintf(stderr, "putting program metadata in cache: %s\n",
+ _mesa_sha1_format(sha1_buf, prog->data->sha1));
+ }
+}
+
+bool
+shader_cache_read_program_metadata(struct gl_context *ctx,
+ struct gl_shader_program *prog)
+{
+ /* Don't try to cache programs genereated by Mesa. Fixed function programs
+ * for example have no shader source so we would need a special way to
+ * generate the a sha for them.
+ */
+ if (prog->Name == 0)
+ return false;
+
+ struct disk_cache *cache = ctx->Cache;
+ if (!cache)
+ return false;
+
+ for (unsigned i = 0; i < prog->NumShaders; i++) {
+ if (prog->Shaders[i]->Stage == MESA_SHADER_COMPUTE) {
+ compile_shaders(ctx, prog);
+ return false;
+ }
+ }
+
+ /* Include bindings when creating sha1. These bindings change the resulting
+ * binary so they are just as important as the shader source.
+ */
+ char *buf = ralloc_strdup(NULL, "vb: ");
+ prog->AttributeBindings->iterate(create_binding_str, &buf);
+ ralloc_strcat(&buf, "fb: ");
+ prog->FragDataBindings->iterate(create_binding_str, &buf);
+ ralloc_strcat(&buf, "fbi: ");
+ prog->FragDataIndexBindings->iterate(create_binding_str, &buf);
+
+ /* SSO has an effect on the linked program so include this when generating
+ * the sha also.
+ */
+ ralloc_asprintf_append(&buf, "sso: %s\n",
+ prog->SeparateShader ? "T" : "F");
+
+ char sha1buf[41];
+ for (unsigned i = 0; i < prog->NumShaders; i++) {
+ struct gl_shader *sh = prog->Shaders[i];
+ ralloc_asprintf_append(&buf, "%s: %s\n",
+ _mesa_shader_stage_to_abbrev(sh->Stage),
+ _mesa_sha1_format(sha1buf, sh->sha1));
+ }
+ _mesa_sha1_compute(buf, strlen(buf), prog->data->sha1);
+ ralloc_free(buf);
+
+ size_t size;
+ uint8_t *buffer = (uint8_t *) disk_cache_get(cache, prog->data->sha1,
+ &size);
+ if (buffer == NULL) {
+ /* Cached program not found. We may have seen the individual shaders
+ * before and skipped compiling but they may not have been used together
+ * in this combination before. Fall back to linking shaders but first
+ * re-compile the shaders.
+ *
+ * We could probably only compile the shaders which were skipped here
+ * but we need to be careful because the source may also have been
+ * changed since the last compile so for now we just recompile
+ * everything.
+ */
+ compile_shaders(ctx, prog);
+ return false;
+ }
+
+ if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
+ fprintf(stderr, "loading shader program meta data from cache: %s\n",
+ _mesa_sha1_format(sha1buf, prog->data->sha1));
+ }
+
+ struct blob_reader metadata;
+ blob_reader_init(&metadata, buffer, size);
+
+ assert(prog->data->UniformStorage == NULL);
+
+ read_uniforms(&metadata, prog);
+
+ prog->data->linked_stages = blob_read_uint32(&metadata);
+
+ unsigned mask = prog->data->linked_stages;
+ while (mask) {
+ const int j = u_bit_scan(&mask);
+ create_linked_shader_and_program(ctx, (gl_shader_stage) j, prog,
+ &metadata);
+ }
+
+ read_uniform_remap_table(&metadata, prog);
+
+ if (metadata.current != metadata.end || metadata.overrun) {
+ /* Something very bad has gone wrong discard the item from the cache and
+ * rebuild from source.
+ */
+ assert(!"Invalid GLSL shader disk cache item!");
+
+ if (ctx->_Shader->Flags & GLSL_CACHE_INFO) {
+ fprintf(stderr, "Error reading program from cache (invalid GLSL "
+ "cache item)\n");
+ }
+
+ disk_cache_remove(cache, prog->data->sha1);
+ compile_shaders(ctx, prog);
+ free(buffer);
+ return false;
+ }
+
+ prog->data->LinkStatus = true;
+
+ free (buffer);
+
+ return true;
+}
diff --git a/src/compiler/glsl/shader_cache.h b/src/compiler/glsl/shader_cache.h
new file mode 100644
index 0000000..8bd0a3c
--- /dev/null
+++ b/src/compiler/glsl/shader_cache.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ *
+ * 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.
+ */
+
+#pragma once
+#ifndef SHADER_CACHE
+#define SHADER_CACHE
+
+#include "util/disk_cache.h"
+
+void
+shader_cache_write_program_metadata(struct gl_context *ctx,
+ struct gl_shader_program *prog);
+
+bool
+shader_cache_read_program_metadata(struct gl_context *ctx,
+ struct gl_shader_program *prog);
+
+#endif /* GLSL_SYMBOL_TABLE */
--
2.9.3
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