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glsl: Squash constant buffers into a single SSBO when we hit the limit

Browse source 
Avoids compilation errors at the cost of shader build times and runtime
performance when a game hits the limit of uniform buffers we can use.
This commit is contained in:
ReinUsesLisp 2020-05-28 17:06:22 -03:00
parent e68ee43a1a
commit ee21e4ecd3
7 changed files with 173 additions and 79 deletions
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44
src/video_core/renderer_opengl/gl_device.cpp
View file

@ -6,6 +6,7 @@
#include <array>
#include <cstddef>
#include <cstring>
#include <limits>
#include <optional>
#include <vector>
@ -26,24 +27,27 @@ constexpr u32 ReservedUniformBlocks = 1;
constexpr u32 NumStages = 5;
constexpr std::array LimitUBOs = {GL_MAX_VERTEX_UNIFORM_BLOCKS, GL_MAX_TESS_CONTROL_UNIFORM_BLOCKS,
GL_MAX_TESS_EVALUATION_UNIFORM_BLOCKS,
GL_MAX_GEOMETRY_UNIFORM_BLOCKS, GL_MAX_FRAGMENT_UNIFORM_BLOCKS};
constexpr std::array LimitUBOs = {
GL_MAX_VERTEX_UNIFORM_BLOCKS, GL_MAX_TESS_CONTROL_UNIFORM_BLOCKS,
GL_MAX_TESS_EVALUATION_UNIFORM_BLOCKS, GL_MAX_GEOMETRY_UNIFORM_BLOCKS,
GL_MAX_FRAGMENT_UNIFORM_BLOCKS, GL_MAX_COMPUTE_UNIFORM_BLOCKS};
constexpr std::array LimitSSBOs = {
GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS,
GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS, GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS,
GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS};
GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS, GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS};
constexpr std::array LimitSamplers = {
GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, GL_MAX_TESS_CONTROL_TEXTURE_IMAGE_UNITS,
GL_MAX_TESS_EVALUATION_TEXTURE_IMAGE_UNITS, GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS,
GL_MAX_TEXTURE_IMAGE_UNITS};
constexpr std::array LimitSamplers = {GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS,
GL_MAX_TESS_CONTROL_TEXTURE_IMAGE_UNITS,
GL_MAX_TESS_EVALUATION_TEXTURE_IMAGE_UNITS,
GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS,
GL_MAX_TEXTURE_IMAGE_UNITS,
GL_MAX_COMPUTE_TEXTURE_IMAGE_UNITS};
constexpr std::array LimitImages = {GL_MAX_VERTEX_IMAGE_UNIFORMS,
GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS,
GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS,
GL_MAX_GEOMETRY_IMAGE_UNIFORMS, GL_MAX_FRAGMENT_IMAGE_UNIFORMS};
constexpr std::array LimitImages = {
GL_MAX_VERTEX_IMAGE_UNIFORMS, GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS,
GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS, GL_MAX_GEOMETRY_IMAGE_UNIFORMS,
GL_MAX_FRAGMENT_IMAGE_UNIFORMS, GL_MAX_COMPUTE_IMAGE_UNIFORMS};
template <typename T>
T GetInteger(GLenum pname) {
@ -85,6 +89,13 @@ u32 Extract(u32& base, u32& num, u32 amount, std::optional<GLenum> limit = {}) {
return std::exchange(base, base + amount);
}
std::array<u32, Tegra::Engines::MaxShaderTypes> BuildMaxUniformBuffers() noexcept {
std::array<u32, Tegra::Engines::MaxShaderTypes> max;
std::transform(LimitUBOs.begin(), LimitUBOs.end(), max.begin(),
[](GLenum pname) { return GetInteger<u32>(pname); });
return max;
}
std::array<Device::BaseBindings, Tegra::Engines::MaxShaderTypes> BuildBaseBindings() noexcept {
std::array<Device::BaseBindings, Tegra::Engines::MaxShaderTypes> bindings;
@ -159,7 +170,8 @@ bool IsASTCSupported() {
} // Anonymous namespace
Device::Device() : base_bindings{BuildBaseBindings()} {
Device::Device()
: max_uniform_buffers{BuildMaxUniformBuffers()}, base_bindings{BuildBaseBindings()} {
const std::string_view vendor = reinterpret_cast<const char*>(glGetString(GL_VENDOR));
const auto renderer = reinterpret_cast<const char*>(glGetString(GL_RENDERER));
const std::vector extensions = GetExtensions();
@ -194,7 +206,9 @@ Device::Device() : base_bindings{BuildBaseBindings()} {
}
Device::Device(std::nullptr_t) {
uniform_buffer_alignment = 0;
max_uniform_buffers.fill(std::numeric_limits<u32>::max());
uniform_buffer_alignment = 4;
shader_storage_alignment = 4;
max_vertex_attributes = 16;
max_varyings = 15;
has_warp_intrinsics = true;
@ -202,8 +216,6 @@ Device::Device(std::nullptr_t) {
has_vertex_viewport_layer = true;
has_image_load_formatted = true;
has_variable_aoffi = true;
has_component_indexing_bug = false;
has_precise_bug = false;
}
bool Device::TestVariableAoffi() {

7
src/video_core/renderer_opengl/gl_device.h
View file

@ -24,6 +24,10 @@ public:
explicit Device();
explicit Device(std::nullptr_t);
u32 GetMaxUniformBuffers(Tegra::Engines::ShaderType shader_type) const noexcept {
return max_uniform_buffers[static_cast<std::size_t>(shader_type)];
}
const BaseBindings& GetBaseBindings(std::size_t stage_index) const noexcept {
return base_bindings[stage_index];
}
@ -92,7 +96,8 @@ private:
static bool TestVariableAoffi();
static bool TestPreciseBug();
std::array<BaseBindings, Tegra::Engines::MaxShaderTypes> base_bindings;
std::array<u32, Tegra::Engines::MaxShaderTypes> max_uniform_buffers{};
std::array<BaseBindings, Tegra::Engines::MaxShaderTypes> base_bindings{};
std::size_t uniform_buffer_alignment{};
std::size_t shader_storage_alignment{};
u32 max_vertex_attributes{};

70
src/video_core/renderer_opengl/gl_rasterizer.cpp
View file

@ -54,6 +54,12 @@ MICROPROFILE_DEFINE(OpenGL_PrimitiveAssembly, "OpenGL", "Prim Asmbl", MP_RGB(255
namespace {
constexpr std::size_t NUM_CONST_BUFFERS_PER_STAGE = 18;
constexpr std::size_t NUM_CONST_BUFFERS_BYTES_PER_STAGE =
NUM_CONST_BUFFERS_PER_STAGE * Maxwell::MaxConstBufferSize;
constexpr std::size_t TOTAL_CONST_BUFFER_BYTES =
NUM_CONST_BUFFERS_BYTES_PER_STAGE * Maxwell::MaxShaderStage;
constexpr std::size_t NumSupportedVertexAttributes = 16;
template <typename Engine, typename Entry>
@ -104,6 +110,9 @@ RasterizerOpenGL::RasterizerOpenGL(Core::System& system, Core::Frontend::EmuWind
screen_info{info}, program_manager{program_manager}, state_tracker{state_tracker} {
CheckExtensions();
unified_uniform_buffer.Create();
glNamedBufferStorage(unified_uniform_buffer.handle, TOTAL_CONST_BUFFER_BYTES, nullptr, 0);
if (device.UseAssemblyShaders()) {
glCreateBuffers(static_cast<GLsizei>(staging_cbufs.size()), staging_cbufs.data());
for (const GLuint cbuf : staging_cbufs) {
@ -842,34 +851,56 @@ void RasterizerOpenGL::SetupDrawConstBuffers(std::size_t stage_index, const Shad
MICROPROFILE_SCOPE(OpenGL_UBO);
const auto& stages = system.GPU().Maxwell3D().state.shader_stages;
const auto& shader_stage = stages[stage_index];
const auto& entries = shader->GetEntries();
const bool use_unified = entries.use_unified_uniforms;
const std::size_t base_unified_offset = stage_index * NUM_CONST_BUFFERS_BYTES_PER_STAGE;
u32 binding =
device.UseAssemblyShaders() ? 0 : device.GetBaseBindings(stage_index).uniform_buffer;
for (const auto& entry : shader->GetEntries().const_buffers) {
const auto& buffer = shader_stage.const_buffers[entry.GetIndex()];
SetupConstBuffer(PARAMETER_LUT[stage_index], binding++, buffer, entry);
const auto base_bindings = device.GetBaseBindings(stage_index);
u32 binding = device.UseAssemblyShaders() ? 0 : base_bindings.uniform_buffer;
for (const auto& entry : entries.const_buffers) {
const u32 index = entry.GetIndex();
const auto& buffer = shader_stage.const_buffers[index];
SetupConstBuffer(PARAMETER_LUT[stage_index], binding, buffer, entry, use_unified,
base_unified_offset + index * Maxwell::MaxConstBufferSize);
++binding;
}
if (use_unified) {
const u32 index = static_cast<u32>(base_bindings.shader_storage_buffer +
entries.global_memory_entries.size());
glBindBufferRange(GL_SHADER_STORAGE_BUFFER, index, unified_uniform_buffer.handle,
base_unified_offset, NUM_CONST_BUFFERS_BYTES_PER_STAGE);
}
}
void RasterizerOpenGL::SetupComputeConstBuffers(const Shader& kernel) {
MICROPROFILE_SCOPE(OpenGL_UBO);
const auto& launch_desc = system.GPU().KeplerCompute().launch_description;
const auto& entries = kernel->GetEntries();
const bool use_unified = entries.use_unified_uniforms;
u32 binding = 0;
for (const auto& entry : kernel->GetEntries().const_buffers) {
for (const auto& entry : entries.const_buffers) {
const auto& config = launch_desc.const_buffer_config[entry.GetIndex()];
const std::bitset<8> mask = launch_desc.const_buffer_enable_mask.Value();
Tegra::Engines::ConstBufferInfo buffer;
buffer.address = config.Address();
buffer.size = config.size;
buffer.enabled = mask[entry.GetIndex()];
SetupConstBuffer(GL_COMPUTE_PROGRAM_PARAMETER_BUFFER_NV, binding++, buffer, entry);
SetupConstBuffer(GL_COMPUTE_PROGRAM_PARAMETER_BUFFER_NV, binding, buffer, entry,
use_unified, entry.GetIndex() * Maxwell::MaxConstBufferSize);
++binding;
}
if (use_unified) {
const GLuint index = static_cast<GLuint>(entries.global_memory_entries.size());
glBindBufferRange(GL_SHADER_STORAGE_BUFFER, index, unified_uniform_buffer.handle, 0,
NUM_CONST_BUFFERS_BYTES_PER_STAGE);
}
}
void RasterizerOpenGL::SetupConstBuffer(GLenum stage, u32 binding,
const Tegra::Engines::ConstBufferInfo& buffer,
const ConstBufferEntry& entry) {
const ConstBufferEntry& entry, bool use_unified,
std::size_t unified_offset) {
if (!buffer.enabled) {
// Set values to zero to unbind buffers
if (device.UseAssemblyShaders()) {
@ -885,13 +916,14 @@ void RasterizerOpenGL::SetupConstBuffer(GLenum stage, u32 binding,
// UBO alignment requirements.
const std::size_t size = Common::AlignUp(GetConstBufferSize(buffer, entry), sizeof(GLvec4));
const auto alignment = device.GetUniformBufferAlignment();
auto [cbuf, offset] = buffer_cache.UploadMemory(buffer.address, size, alignment, false,
device.HasFastBufferSubData());
if (!device.UseAssemblyShaders()) {
glBindBufferRange(GL_UNIFORM_BUFFER, binding, cbuf, offset, size);
return;
}
const bool fast_upload = !use_unified && device.HasFastBufferSubData();
const std::size_t alignment = use_unified ? 4 : device.GetUniformBufferAlignment();
const GPUVAddr gpu_addr = buffer.address;
auto [cbuf, offset] = buffer_cache.UploadMemory(gpu_addr, size, alignment, false, fast_upload);
if (device.UseAssemblyShaders()) {
UNIMPLEMENTED_IF(use_unified);
if (offset != 0) {
const GLuint staging_cbuf = staging_cbufs[current_cbuf++];
glCopyNamedBufferSubData(cbuf, staging_cbuf, offset, 0, size);
@ -899,6 +931,14 @@ void RasterizerOpenGL::SetupConstBuffer(GLenum stage, u32 binding,
offset = 0;
}
glBindBufferRangeNV(stage, binding, cbuf, offset, size);
return;
}
if (use_unified) {
glCopyNamedBufferSubData(cbuf, unified_uniform_buffer.handle, offset, unified_offset, size);
} else {
glBindBufferRange(GL_UNIFORM_BUFFER, binding, cbuf, offset, size);
}
}
void RasterizerOpenGL::SetupDrawGlobalMemory(std::size_t stage_index, const Shader& shader) {

4
src/video_core/renderer_opengl/gl_rasterizer.h
View file

@ -107,7 +107,8 @@ private:
/// Configures a constant buffer.
void SetupConstBuffer(GLenum stage, u32 binding, const Tegra::Engines::ConstBufferInfo& buffer,
const ConstBufferEntry& entry);
const ConstBufferEntry& entry, bool use_unified,
std::size_t unified_offset);
/// Configures the current global memory entries to use for the draw command.
void SetupDrawGlobalMemory(std::size_t stage_index, const Shader& shader);
@ -253,6 +254,7 @@ private:
Tegra::Engines::Maxwell3D::Regs::MaxShaderProgram;
std::array<GLuint, NUM_CONSTANT_BUFFERS> staging_cbufs{};
std::size_t current_cbuf = 0;
OGLBuffer unified_uniform_buffer;
/// Number of commands queued to the OpenGL driver. Reseted on flush.
std::size_t num_queued_commands = 0;

12
src/video_core/renderer_opengl/gl_shader_cache.cpp
View file

@ -241,8 +241,9 @@ Shader CachedShader::CreateStageFromMemory(const ShaderParameters& params,
entry.bindless_samplers = registry->GetBindlessSamplers();
params.disk_cache.SaveEntry(std::move(entry));
return std::shared_ptr<CachedShader>(new CachedShader(
params.cpu_addr, size_in_bytes, std::move(registry), MakeEntries(ir), std::move(program)));
return std::shared_ptr<CachedShader>(
new CachedShader(params.cpu_addr, size_in_bytes, std::move(registry),
MakeEntries(params.device, ir, shader_type), std::move(program)));
}
Shader CachedShader::CreateKernelFromMemory(const ShaderParameters& params, ProgramCode code) {
@ -265,8 +266,9 @@ Shader CachedShader::CreateKernelFromMemory(const ShaderParameters& params, Prog
entry.bindless_samplers = registry->GetBindlessSamplers();
params.disk_cache.SaveEntry(std::move(entry));
return std::shared_ptr<CachedShader>(new CachedShader(
params.cpu_addr, size_in_bytes, std::move(registry), MakeEntries(ir), std::move(program)));
return std::shared_ptr<CachedShader>(
new CachedShader(params.cpu_addr, size_in_bytes, std::move(registry),
MakeEntries(params.device, ir, ShaderType::Compute), std::move(program)));
}
Shader CachedShader::CreateFromCache(const ShaderParameters& params,
@ -348,7 +350,7 @@ void ShaderCacheOpenGL::LoadDiskCache(const std::atomic_bool& stop_loading,
PrecompiledShader shader;
shader.program = std::move(program);
shader.registry = std::move(registry);
shader.entries = MakeEntries(ir);
shader.entries = MakeEntries(device, ir, entry.type);
std::scoped_lock lock{mutex};
if (callback) {

59
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
View file

@ -61,8 +61,8 @@ struct TextureDerivates {};
using TextureArgument = std::pair<Type, Node>;
using TextureIR = std::variant<TextureOffset, TextureDerivates, TextureArgument>;
constexpr u32 MAX_CONSTBUFFER_ELEMENTS =
static_cast<u32>(Maxwell::MaxConstBufferSize) / (4 * sizeof(float));
constexpr u32 MAX_CONSTBUFFER_SCALARS = static_cast<u32>(Maxwell::MaxConstBufferSize) / sizeof(u32);
constexpr u32 MAX_CONSTBUFFER_ELEMENTS = MAX_CONSTBUFFER_SCALARS / sizeof(u32);
constexpr std::string_view CommonDeclarations = R"(#define ftoi floatBitsToInt
#define ftou floatBitsToUint
@ -402,6 +402,13 @@ std::string FlowStackTopName(MetaStackClass stack) {
return fmt::format("{}_flow_stack_top", GetFlowStackPrefix(stack));
}
bool UseUnifiedUniforms(const Device& device, const ShaderIR& ir, ShaderType stage) {
const u32 num_ubos = static_cast<u32>(ir.GetConstantBuffers().size());
// We waste one UBO for emulation
const u32 num_available_ubos = device.GetMaxUniformBuffers(stage) - 1;
return num_ubos > num_available_ubos;
}
struct GenericVaryingDescription {
std::string name;
u8 first_element = 0;
@ -412,8 +419,9 @@ class GLSLDecompiler final {
public:
explicit GLSLDecompiler(const Device& device, const ShaderIR& ir, const Registry& registry,
ShaderType stage, std::string_view identifier, std::string_view suffix)
: device{device}, ir{ir}, registry{registry}, stage{stage},
identifier{identifier}, suffix{suffix}, header{ir.GetHeader()} {
: device{device}, ir{ir}, registry{registry}, stage{stage}, identifier{identifier},
suffix{suffix}, header{ir.GetHeader()}, use_unified_uniforms{
UseUnifiedUniforms(device, ir, stage)} {
if (stage != ShaderType::Compute) {
transform_feedback = BuildTransformFeedback(registry.GetGraphicsInfo());
}
@ -834,12 +842,24 @@ private:
}
void DeclareConstantBuffers() {
if (use_unified_uniforms) {
const u32 binding = device.GetBaseBindings(stage).shader_storage_buffer +
static_cast<u32>(ir.GetGlobalMemory().size());
code.AddLine("layout (std430, binding = {}) readonly buffer UnifiedUniforms {{",
binding);
code.AddLine(" uint cbufs[];");
code.AddLine("}};");
code.AddNewLine();
return;
}
u32 binding = device.GetBaseBindings(stage).uniform_buffer;
for (const auto& buffers : ir.GetConstantBuffers()) {
const auto index = buffers.first;
for (const auto [index, info] : ir.GetConstantBuffers()) {
const u32 num_elements = Common::AlignUp(info.GetSize(), 4) / 4;
const u32 size = info.IsIndirect() ? MAX_CONSTBUFFER_ELEMENTS : num_elements;
code.AddLine("layout (std140, binding = {}) uniform {} {{", binding++,
GetConstBufferBlock(index));
code.AddLine(" uvec4 {}[{}];", GetConstBuffer(index), MAX_CONSTBUFFER_ELEMENTS);
code.AddLine(" uvec4 {}[{}];", GetConstBuffer(index), size);
code.AddLine("}};");
code.AddNewLine();
}
@ -1038,17 +1058,29 @@ private:
if (const auto cbuf = std::get_if<CbufNode>(&*node)) {
const Node offset = cbuf->GetOffset();
const u32 base_unified_offset = cbuf->GetIndex() * MAX_CONSTBUFFER_SCALARS;
if (const auto immediate = std::get_if<ImmediateNode>(&*offset)) {
// Direct access
const u32 offset_imm = immediate->GetValue();
ASSERT_MSG(offset_imm % 4 == 0, "Unaligned cbuf direct access");
if (use_unified_uniforms) {
return {fmt::format("cbufs[{}]", base_unified_offset + offset_imm / 4),
Type::Uint};
} else {
return {fmt::format("{}[{}][{}]", GetConstBuffer(cbuf->GetIndex()),
offset_imm / (4 * 4), (offset_imm / 4) % 4),
Type::Uint};
}
}
if (std::holds_alternative<OperationNode>(*offset)) {
// Indirect access
if (use_unified_uniforms) {
return {fmt::format("cbufs[{} + ({} >> 2)]", base_unified_offset,
Visit(offset).AsUint()),
Type::Uint};
}
const std::string final_offset = code.GenerateTemporary();
code.AddLine("uint {} = {} >> 2;", final_offset, Visit(offset).AsUint());
@ -1067,15 +1099,12 @@ private:
const std::string result = code.GenerateTemporary();
code.AddLine("uint {};", result);
for (u32 swizzle = 0; swizzle < 4; ++swizzle) {
code.AddLine("if (({} & 3) == {}) {} = {}{};", final_offset, swizzle, result,
pack, GetSwizzle(swizzle));
code.AddLine("if (({} & 3) == {}) {} = {}{};", final_offset, swizzle, result, pack,
GetSwizzle(swizzle));
}
return {result, Type::Uint};
}
UNREACHABLE_MSG("Unmanaged offset node type");
}
if (const auto gmem = std::get_if<GmemNode>(&*node)) {
const std::string real = Visit(gmem->GetRealAddress()).AsUint();
const std::string base = Visit(gmem->GetBaseAddress()).AsUint();
@ -2710,6 +2739,7 @@ private:
const std::string_view identifier;
const std::string_view suffix;
const Header header;
const bool use_unified_uniforms;
std::unordered_map<u8, VaryingTFB> transform_feedback;
ShaderWriter code;
@ -2905,7 +2935,7 @@ void GLSLDecompiler::DecompileAST() {
} // Anonymous namespace
ShaderEntries MakeEntries(const VideoCommon::Shader::ShaderIR& ir) {
ShaderEntries MakeEntries(const Device& device, const ShaderIR& ir, ShaderType stage) {
ShaderEntries entries;
for (const auto& cbuf : ir.GetConstantBuffers()) {
entries.const_buffers.emplace_back(cbuf.second.GetMaxOffset(), cbuf.second.IsIndirect(),
@ -2926,6 +2956,7 @@ ShaderEntries MakeEntries(const VideoCommon::Shader::ShaderIR& ir) {
entries.clip_distances = (clip_distances[i] ? 1U : 0U) << i;
}
entries.shader_length = ir.GetLength();
entries.use_unified_uniforms = UseUnifiedUniforms(device, ir, stage);
return entries;
}

6
src/video_core/renderer_opengl/gl_shader_decompiler.h
View file

@ -53,11 +53,13 @@ struct ShaderEntries {
std::vector<GlobalMemoryEntry> global_memory_entries;
std::vector<SamplerEntry> samplers;
std::vector<ImageEntry> images;
u32 clip_distances{};
std::size_t shader_length{};
u32 clip_distances{};
bool use_unified_uniforms{};
};
ShaderEntries MakeEntries(const VideoCommon::Shader::ShaderIR& ir);
ShaderEntries MakeEntries(const Device& device, const VideoCommon::Shader::ShaderIR& ir,
Tegra::Engines::ShaderType stage);
std::string DecompileShader(const Device& device, const VideoCommon::Shader::ShaderIR& ir,
const VideoCommon::Shader::Registry& registry,