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Merge pull request #1960 from ReinUsesLisp/shader-ir-ldg 

video_core: Implement LDG through heuristics based on IR
This commit is contained in:
bunnei 2019-01-29 22:02:01 -05:00 committed by GitHub
parent ba38d91fe2 9f803299de
commit 52bb524526
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 380 additions and 14 deletions
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1
src/video_core/CMakeLists.txt
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@ -87,6 +87,7 @@ add_library(video_core STATIC
shader/decode.cpp
shader/shader_ir.cpp
shader/shader_ir.h
shader/track.cpp
surface.cpp
surface.h
textures/astc.cpp

8
src/video_core/engines/shader_bytecode.h
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@ -208,6 +208,8 @@ enum class UniformType : u64 {
SignedShort = 3,
Single = 4,
Double = 5,
Quad = 6,
UnsignedQuad = 7,
};
enum class StoreType : u64 {
@ -784,6 +786,12 @@ union Instruction {
BitField<44, 2, u64> unknown;
} st_l;
union {
BitField<48, 3, UniformType> type;
BitField<46, 2, u64> cache_mode;
BitField<20, 24, s64> immediate_offset;
} ldg;
union {
BitField<0, 3, u64> pred0;
BitField<3, 3, u64> pred3;

70
src/video_core/renderer_opengl/gl_global_cache.cpp
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@ -4,8 +4,13 @@
#include <glad/glad.h>
#include "common/assert.h"
#include "common/logging/log.h"
#include "core/core.h"
#include "core/memory.h"
#include "video_core/renderer_opengl/gl_global_cache.h"
#include "video_core/renderer_opengl/gl_rasterizer.h"
#include "video_core/renderer_opengl/gl_shader_decompiler.h"
#include "video_core/renderer_opengl/utils.h"
namespace OpenGL {
@ -18,7 +23,72 @@ CachedGlobalRegion::CachedGlobalRegion(VAddr addr, u32 size) : addr{addr}, size{
LabelGLObject(GL_BUFFER, buffer.handle, addr, "GlobalMemory");
}
void CachedGlobalRegion::Reload(u32 size_) {
constexpr auto max_size = static_cast<u32>(RasterizerOpenGL::MaxGlobalMemorySize);
size = size_;
if (size > max_size) {
size = max_size;
LOG_CRITICAL(HW_GPU, "Global region size {} exceeded the expected size {}!", size_,
max_size);
}
// TODO(Rodrigo): Get rid of Memory::GetPointer with a staging buffer
glBindBuffer(GL_SHADER_STORAGE_BUFFER, buffer.handle);
glBufferData(GL_SHADER_STORAGE_BUFFER, size, Memory::GetPointer(addr), GL_DYNAMIC_DRAW);
}
GlobalRegion GlobalRegionCacheOpenGL::TryGetReservedGlobalRegion(VAddr addr, u32 size) const {
const auto search{reserve.find(addr)};
if (search == reserve.end()) {
return {};
}
return search->second;
}
GlobalRegion GlobalRegionCacheOpenGL::GetUncachedGlobalRegion(VAddr addr, u32 size) {
GlobalRegion region{TryGetReservedGlobalRegion(addr, size)};
if (!region) {
// No reserved surface available, create a new one and reserve it
region = std::make_shared<CachedGlobalRegion>(addr, size);
ReserveGlobalRegion(region);
}
region->Reload(size);
return region;
}
void GlobalRegionCacheOpenGL::ReserveGlobalRegion(const GlobalRegion& region) {
reserve[region->GetAddr()] = region;
}
GlobalRegionCacheOpenGL::GlobalRegionCacheOpenGL(RasterizerOpenGL& rasterizer)
: RasterizerCache{rasterizer} {}
GlobalRegion GlobalRegionCacheOpenGL::GetGlobalRegion(
const GLShader::GlobalMemoryEntry& global_region,
Tegra::Engines::Maxwell3D::Regs::ShaderStage stage) {
auto& gpu{Core::System::GetInstance().GPU()};
const auto cbufs = gpu.Maxwell3D().state.shader_stages[static_cast<u64>(stage)];
const auto cbuf_addr = gpu.MemoryManager().GpuToCpuAddress(
cbufs.const_buffers[global_region.GetCbufIndex()].address + global_region.GetCbufOffset());
ASSERT(cbuf_addr);
const auto actual_addr_gpu = Memory::Read64(*cbuf_addr);
const auto size = Memory::Read32(*cbuf_addr + 8);
const auto actual_addr = gpu.MemoryManager().GpuToCpuAddress(actual_addr_gpu);
ASSERT(actual_addr);
// Look up global region in the cache based on address
GlobalRegion region = TryGet(*actual_addr);
if (!region) {
// No global region found - create a new one
region = GetUncachedGlobalRegion(*actual_addr, size);
Register(region);
}
return region;
}
} // namespace OpenGL

18
src/video_core/renderer_opengl/gl_global_cache.h
View File

@ -5,9 +5,13 @@
#pragma once
#include <memory>
#include <unordered_map>
#include <glad/glad.h>
#include "common/assert.h"
#include "common/common_types.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/rasterizer_cache.h"
#include "video_core/renderer_opengl/gl_resource_manager.h"
@ -40,6 +44,9 @@ public:
return buffer.handle;
}
/// Reloads the global region from guest memory
void Reload(u32 size_);
// TODO(Rodrigo): When global memory is written (STG), implement flushing
void Flush() override {
UNIMPLEMENTED();
@ -55,6 +62,17 @@ private:
class GlobalRegionCacheOpenGL final : public RasterizerCache<GlobalRegion> {
public:
explicit GlobalRegionCacheOpenGL(RasterizerOpenGL& rasterizer);
/// Gets the current specified shader stage program
GlobalRegion GetGlobalRegion(const GLShader::GlobalMemoryEntry& descriptor,
Tegra::Engines::Maxwell3D::Regs::ShaderStage stage);
private:
GlobalRegion TryGetReservedGlobalRegion(VAddr addr, u32 size) const;
GlobalRegion GetUncachedGlobalRegion(VAddr addr, u32 size);
void ReserveGlobalRegion(const GlobalRegion& region);
std::unordered_map<VAddr, GlobalRegion> reserve;
};
} // namespace OpenGL

22
src/video_core/renderer_opengl/gl_rasterizer.cpp
View File

@ -300,6 +300,7 @@ void RasterizerOpenGL::SetupShaders(GLenum primitive_mode) {
// Next available bindpoints to use when uploading the const buffers and textures to the GLSL
// shaders. The constbuffer bindpoint starts after the shader stage configuration bind points.
u32 current_constbuffer_bindpoint = Tegra::Engines::Maxwell3D::Regs::MaxShaderStage;
u32 current_gmem_bindpoint = 0;
u32 current_texture_bindpoint = 0;
std::array<bool, Maxwell::NumClipDistances> clip_distances{};
@ -358,6 +359,10 @@ void RasterizerOpenGL::SetupShaders(GLenum primitive_mode) {
SetupConstBuffers(static_cast<Maxwell::ShaderStage>(stage), shader, primitive_mode,
current_constbuffer_bindpoint);
// Configure global memory regions for this shader stage.
current_gmem_bindpoint = SetupGlobalRegions(static_cast<Maxwell::ShaderStage>(stage),
shader, primitive_mode, current_gmem_bindpoint);
// Configure the textures for this shader stage.
current_texture_bindpoint = SetupTextures(static_cast<Maxwell::ShaderStage>(stage), shader,
primitive_mode, current_texture_bindpoint);
@ -993,6 +998,23 @@ u32 RasterizerOpenGL::SetupConstBuffers(Maxwell::ShaderStage stage, Shader& shad
return current_bindpoint + static_cast<u32>(entries.size());
}
u32 RasterizerOpenGL::SetupGlobalRegions(Maxwell::ShaderStage stage, Shader& shader,
GLenum primitive_mode, u32 current_bindpoint) {
for (const auto& global_region : shader->GetShaderEntries().global_memory_entries) {
const auto& region =
global_cache.GetGlobalRegion(global_region, static_cast<Maxwell::ShaderStage>(stage));
const GLuint block_index{shader->GetProgramResourceIndex(global_region)};
ASSERT(block_index != GL_INVALID_INDEX);
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, current_bindpoint, region->GetBufferHandle());
glShaderStorageBlockBinding(shader->GetProgramHandle(primitive_mode), block_index,
current_bindpoint);
++current_bindpoint;
}
return current_bindpoint;
}
u32 RasterizerOpenGL::SetupTextures(Maxwell::ShaderStage stage, Shader& shader,
GLenum primitive_mode, u32 current_unit) {
MICROPROFILE_SCOPE(OpenGL_Texture);

10
src/video_core/renderer_opengl/gl_rasterizer.h
View File

@ -137,6 +137,16 @@ private:
u32 SetupConstBuffers(Tegra::Engines::Maxwell3D::Regs::ShaderStage stage, Shader& shader,
GLenum primitive_mode, u32 current_bindpoint);
/**
* Configures the current global memory regions to use for the draw command.
* @param stage The shader stage to configure buffers for.
* @param shader The shader object that contains the specified stage.
* @param current_bindpoint The offset at which to start counting new buffer bindpoints.
* @returns The next available bindpoint for use in the next shader stage.
*/
u32 SetupGlobalRegions(Tegra::Engines::Maxwell3D::Regs::ShaderStage stage, Shader& shader,
GLenum primitive_mode, u32 current_bindpoint);
/**
* Configures the current textures to use for the draw command.
* @param stage The shader stage to configure textures for.

18
src/video_core/renderer_opengl/gl_shader_cache.cpp
View File

@ -108,11 +108,23 @@ CachedShader::CachedShader(VAddr addr, Maxwell::ShaderProgram program_type)
}
GLuint CachedShader::GetProgramResourceIndex(const GLShader::ConstBufferEntry& buffer) {
const auto search{resource_cache.find(buffer.GetHash())};
if (search == resource_cache.end()) {
const auto search{cbuf_resource_cache.find(buffer.GetHash())};
if (search == cbuf_resource_cache.end()) {
const GLuint index{
glGetProgramResourceIndex(program.handle, GL_UNIFORM_BLOCK, buffer.GetName().c_str())};
resource_cache[buffer.GetHash()] = index;
cbuf_resource_cache[buffer.GetHash()] = index;
return index;
}
return search->second;
}
GLuint CachedShader::GetProgramResourceIndex(const GLShader::GlobalMemoryEntry& global_mem) {
const auto search{gmem_resource_cache.find(global_mem.GetHash())};
if (search == gmem_resource_cache.end()) {
const GLuint index{glGetProgramResourceIndex(program.handle, GL_SHADER_STORAGE_BLOCK,
global_mem.GetName().c_str())};
gmem_resource_cache[global_mem.GetHash()] = index;
return index;
}

6
src/video_core/renderer_opengl/gl_shader_cache.h
View File

@ -76,6 +76,9 @@ public:
/// Gets the GL program resource location for the specified resource, caching as needed
GLuint GetProgramResourceIndex(const GLShader::ConstBufferEntry& buffer);
/// Gets the GL program resource location for the specified resource, caching as needed
GLuint GetProgramResourceIndex(const GLShader::GlobalMemoryEntry& global_mem);
/// Gets the GL uniform location for the specified resource, caching as needed
GLint GetUniformLocation(const GLShader::SamplerEntry& sampler);
@ -107,7 +110,8 @@ private:
OGLProgram triangles_adjacency;
} geometry_programs;
std::map<u32, GLuint> resource_cache;
std::map<u32, GLuint> cbuf_resource_cache;
std::map<u32, GLuint> gmem_resource_cache;
std::map<u32, GLint> uniform_cache;
};

44
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -34,6 +34,8 @@ using Operation = const OperationNode&;
enum : u32 { POSITION_VARYING_LOCATION = 0, GENERIC_VARYING_START_LOCATION = 1 };
constexpr u32 MAX_CONSTBUFFER_ELEMENTS =
static_cast<u32>(RasterizerOpenGL::MaxConstbufferSize) / (4 * sizeof(float));
constexpr u32 MAX_GLOBALMEMORY_ELEMENTS =
static_cast<u32>(RasterizerOpenGL::MaxGlobalMemorySize) / sizeof(float);
enum class Type { Bool, Bool2, Float, Int, Uint, HalfFloat };
@ -143,6 +145,7 @@ public:
DeclareInputAttributes();
DeclareOutputAttributes();
DeclareConstantBuffers();
DeclareGlobalMemory();
DeclareSamplers();
code.AddLine("void execute_" + suffix + "() {");
@ -190,12 +193,15 @@ public:
ShaderEntries GetShaderEntries() const {
ShaderEntries entries;
for (const auto& cbuf : ir.GetConstantBuffers()) {
ConstBufferEntry desc(cbuf.second, stage, GetConstBufferBlock(cbuf.first), cbuf.first);
entries.const_buffers.push_back(desc);
entries.const_buffers.emplace_back(cbuf.second, stage, GetConstBufferBlock(cbuf.first),
cbuf.first);
}
for (const auto& sampler : ir.GetSamplers()) {
SamplerEntry desc(sampler, stage, GetSampler(sampler));
entries.samplers.push_back(desc);
entries.samplers.emplace_back(sampler, stage, GetSampler(sampler));
}
for (const auto& gmem : ir.GetGlobalMemoryBases()) {
entries.global_memory_entries.emplace_back(gmem.cbuf_index, gmem.cbuf_offset, stage,
GetGlobalMemoryBlock(gmem));
}
entries.clip_distances = ir.GetClipDistances();
entries.shader_length = ir.GetLength();
@ -375,6 +381,15 @@ private:
}
}
void DeclareGlobalMemory() {
for (const auto& entry : ir.GetGlobalMemoryBases()) {
code.AddLine("layout (std430) buffer " + GetGlobalMemoryBlock(entry) + " {");
code.AddLine(" float " + GetGlobalMemory(entry) + "[MAX_GLOBALMEMORY_ELEMENTS];");
code.AddLine("};");
code.AddNewLine();
}
}
void DeclareSamplers() {
const auto& samplers = ir.GetSamplers();
for (const auto& sampler : samplers) {
@ -538,6 +553,12 @@ private:
UNREACHABLE_MSG("Unmanaged offset node type");
}
} else if (const auto gmem = std::get_if<GmemNode>(node)) {
const std::string real = Visit(gmem->GetRealAddress());
const std::string base = Visit(gmem->GetBaseAddress());
const std::string final_offset = "(ftou(" + real + ") - ftou(" + base + ")) / 4";
return fmt::format("{}[{}]", GetGlobalMemory(gmem->GetDescriptor()), final_offset);
} else if (const auto lmem = std::get_if<LmemNode>(node)) {
return fmt::format("{}[ftou({}) / 4]", GetLocalMemory(), Visit(lmem->GetAddress()));
@ -1471,6 +1492,15 @@ private:
return GetDeclarationWithSuffix(index, "cbuf");
}
std::string GetGlobalMemory(const GlobalMemoryBase& descriptor) const {
return fmt::format("gmem_{}_{}_{}", descriptor.cbuf_index, descriptor.cbuf_offset, suffix);
}
std::string GetGlobalMemoryBlock(const GlobalMemoryBase& descriptor) const {
return fmt::format("gmem_block_{}_{}_{}", descriptor.cbuf_index, descriptor.cbuf_offset,
suffix);
}
std::string GetConstBufferBlock(u32 index) const {
return GetDeclarationWithSuffix(index, "cbuf_block");
}
@ -1505,8 +1535,10 @@ private:
};
std::string GetCommonDeclarations() {
return "#define MAX_CONSTBUFFER_ELEMENTS " + std::to_string(MAX_CONSTBUFFER_ELEMENTS) +
"\n"
const auto cbuf = std::to_string(MAX_CONSTBUFFER_ELEMENTS);
const auto gmem = std::to_string(MAX_GLOBALMEMORY_ELEMENTS);
return "#define MAX_CONSTBUFFER_ELEMENTS " + cbuf + "\n" +
"#define MAX_GLOBALMEMORY_ELEMENTS " + gmem + "\n" +
"#define ftoi floatBitsToInt\n"
"#define ftou floatBitsToUint\n"
"#define itof intBitsToFloat\n"

34
src/video_core/renderer_opengl/gl_shader_decompiler.h
View File

@ -71,9 +71,43 @@ private:
Maxwell::ShaderStage stage{};
};
class GlobalMemoryEntry {
public:
explicit GlobalMemoryEntry(u32 cbuf_index, u32 cbuf_offset, Maxwell::ShaderStage stage,
std::string name)
: cbuf_index{cbuf_index}, cbuf_offset{cbuf_offset}, stage{stage}, name{std::move(name)} {}
u32 GetCbufIndex() const {
return cbuf_index;
}
u32 GetCbufOffset() const {
return cbuf_offset;
}
const std::string& GetName() const {
return name;
}
Maxwell::ShaderStage GetStage() const {
return stage;
}
u32 GetHash() const {
return (static_cast<u32>(stage) << 24) | (cbuf_index << 16) | cbuf_offset;
}
private:
u32 cbuf_index{};
u32 cbuf_offset{};
Maxwell::ShaderStage stage{};
std::string name;
};
struct ShaderEntries {
std::vector<ConstBufferEntry> const_buffers;
std::vector<SamplerEntry> samplers;
std::vector<GlobalMemoryEntry> global_memory_entries;
std::array<bool, Maxwell::NumClipDistances> clip_distances{};
std::size_t shader_length{};
};

49
src/video_core/shader/decode/memory.cpp
View File

@ -4,6 +4,7 @@
#include <algorithm>
#include <vector>
#include <fmt/format.h>
#include "common/assert.h"
#include "common/common_types.h"
@ -119,6 +120,54 @@ u32 ShaderIR::DecodeMemory(BasicBlock& bb, const BasicBlock& code, u32 pc) {
}
break;
}
case OpCode::Id::LDG: {
const u32 count = [&]() {
switch (instr.ldg.type) {
case Tegra::Shader::UniformType::Single:
return 1;
case Tegra::Shader::UniformType::Double:
return 2;
case Tegra::Shader::UniformType::Quad:
case Tegra::Shader::UniformType::UnsignedQuad:
return 4;
default:
UNIMPLEMENTED_MSG("Unimplemented LDG size!");
return 1;
}
}();
const Node addr_register = GetRegister(instr.gpr8);
const Node base_address = TrackCbuf(addr_register, code, static_cast<s64>(code.size()));
const auto cbuf = std::get_if<CbufNode>(base_address);
ASSERT(cbuf != nullptr);
const auto cbuf_offset_imm = std::get_if<ImmediateNode>(cbuf->GetOffset());
ASSERT(cbuf_offset_imm != nullptr);
const auto cbuf_offset = cbuf_offset_imm->GetValue() * 4;
bb.push_back(Comment(
fmt::format("Base address is c[0x{:x}][0x{:x}]", cbuf->GetIndex(), cbuf_offset)));
const GlobalMemoryBase descriptor{cbuf->GetIndex(), cbuf_offset};
used_global_memory_bases.insert(descriptor);
const Node immediate_offset =
Immediate(static_cast<u32>(instr.ldg.immediate_offset.Value()));
const Node base_real_address =
Operation(OperationCode::UAdd, NO_PRECISE, immediate_offset, addr_register);
for (u32 i = 0; i < count; ++i) {
const Node it_offset = Immediate(i * 4);
const Node real_address =
Operation(OperationCode::UAdd, NO_PRECISE, base_real_address, it_offset);
const Node gmem = StoreNode(GmemNode(real_address, base_address, descriptor));
SetTemporal(bb, i, gmem);
}
for (u32 i = 0; i < count; ++i) {
SetRegister(bb, instr.gpr0.Value() + i, GetTemporal(i));
}
break;
}
case OpCode::Id::ST_A: {
UNIMPLEMENTED_IF_MSG(instr.gpr8.Value() != Register::ZeroIndex,
"Indirect attribute loads are not supported");

38
src/video_core/shader/shader_ir.h
View File

@ -257,6 +257,15 @@ private:
bool is_indirect{};
};
struct GlobalMemoryBase {
u32 cbuf_index{};
u32 cbuf_offset{};
bool operator<(const GlobalMemoryBase& rhs) const {
return std::tie(cbuf_index, cbuf_offset) < std::tie(rhs.cbuf_index, rhs.cbuf_offset);
}
};
struct MetaArithmetic {
bool precise{};
};
@ -478,14 +487,26 @@ private:
/// Global memory node
class GmemNode final {
public:
explicit constexpr GmemNode(Node address) : address{address} {}
explicit constexpr GmemNode(Node real_address, Node base_address,
const GlobalMemoryBase& descriptor)
: real_address{real_address}, base_address{base_address}, descriptor{descriptor} {}
Node GetAddress() const {
return address;
Node GetRealAddress() const {
return real_address;
}
Node GetBaseAddress() const {
return base_address;
}
const GlobalMemoryBase& GetDescriptor() const {
return descriptor;
}
private:
const Node address;
const Node real_address;
const Node base_address;
const GlobalMemoryBase descriptor;
};
/// Commentary, can be dropped
@ -543,6 +564,10 @@ public:
return used_clip_distances;
}
const std::set<GlobalMemoryBase>& GetGlobalMemoryBases() const {
return used_global_memory_bases;
}
std::size_t GetLength() const {
return static_cast<std::size_t>(coverage_end * sizeof(u64));
}
@ -734,6 +759,10 @@ private:
void WriteLop3Instruction(BasicBlock& bb, Tegra::Shader::Register dest, Node op_a, Node op_b,
Node op_c, Node imm_lut, bool sets_cc);
Node TrackCbuf(Node tracked, const BasicBlock& code, s64 cursor);
std::pair<Node, s64> TrackRegister(const GprNode* tracked, const BasicBlock& code, s64 cursor);
template <typename... T>
Node Operation(OperationCode code, const T*... operands) {
return StoreNode(OperationNode(code, operands...));
@ -786,6 +815,7 @@ private:
std::map<u32, ConstBuffer> used_cbufs;
std::set<Sampler> used_samplers;
std::array<bool, Tegra::Engines::Maxwell3D::Regs::NumClipDistances> used_clip_distances{};
std::set<GlobalMemoryBase> used_global_memory_bases;
Tegra::Shader::Header header;
};

76
src/video_core/shader/track.cpp Normal file
View File

@ -0,0 +1,76 @@
// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <utility>
#include <variant>
#include "video_core/shader/shader_ir.h"
namespace VideoCommon::Shader {
namespace {
std::pair<Node, s64> FindOperation(const BasicBlock& code, s64 cursor,
OperationCode operation_code) {
for (; cursor >= 0; --cursor) {
const Node node = code[cursor];
if (const auto operation = std::get_if<OperationNode>(node)) {
if (operation->GetCode() == operation_code)
return {node, cursor};
}
}
return {};
}
} // namespace
Node ShaderIR::TrackCbuf(Node tracked, const BasicBlock& code, s64 cursor) {
if (const auto cbuf = std::get_if<CbufNode>(tracked)) {
// Cbuf found, but it has to be immediate
return std::holds_alternative<ImmediateNode>(*cbuf->GetOffset()) ? tracked : nullptr;
}
if (const auto gpr = std::get_if<GprNode>(tracked)) {
if (gpr->GetIndex() == Tegra::Shader::Register::ZeroIndex) {
return nullptr;
}
// Reduce the cursor in one to avoid infinite loops when the instruction sets the same
// register that it uses as operand
const auto [source, new_cursor] = TrackRegister(gpr, code, cursor - 1);
if (!source) {
return nullptr;
}
return TrackCbuf(source, code, new_cursor);
}
if (const auto operation = std::get_if<OperationNode>(tracked)) {
for (std::size_t i = 0; i < operation->GetOperandsCount(); ++i) {
if (const auto found = TrackCbuf((*operation)[i], code, cursor)) {
// Cbuf found in operand
return found;
}
}
return nullptr;
}
return nullptr;
}
std::pair<Node, s64> ShaderIR::TrackRegister(const GprNode* tracked, const BasicBlock& code,
s64 cursor) {
for (; cursor >= 0; --cursor) {
const auto [found_node, new_cursor] = FindOperation(code, cursor, OperationCode::Assign);
if (!found_node) {
return {};
}
const auto operation = std::get_if<OperationNode>(found_node);
ASSERT(operation);
const auto& target = (*operation)[0];
if (const auto gpr_target = std::get_if<GprNode>(target)) {
if (gpr_target->GetIndex() == tracked->GetIndex()) {
return {(*operation)[1], new_cursor};
}
}
}
return {};
}
} // namespace VideoCommon::Shader