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GPU: Implement sampling multiple textures in the generated glsl shaders. 

All tested games that use a single texture show no regression.

Only Texture2D textures are supported right now, each shader gets its own "tex_fs/vs/gs" sampler array to maintain independent textures between shader stages, the textures themselves are reused if possible.
This commit is contained in:
Subv 2018-06-06 12:58:16 -05:00
parent be09dfeed9
commit dbfc39d214
9 changed files with 172 additions and 69 deletions
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34
src/video_core/engines/maxwell_3d.cpp
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@ -354,6 +354,40 @@ std::vector<Texture::FullTextureInfo> Maxwell3D::GetStageTextures(Regs::ShaderSt
return textures;
}
Texture::FullTextureInfo Maxwell3D::GetStageTexture(Regs::ShaderStage stage, size_t offset) const {
auto& shader = state.shader_stages[static_cast<size_t>(stage)];
auto& tex_info_buffer = shader.const_buffers[regs.tex_cb_index];
ASSERT(tex_info_buffer.enabled && tex_info_buffer.address != 0);
GPUVAddr tex_info_address = tex_info_buffer.address + offset * sizeof(Texture::TextureHandle);
ASSERT(tex_info_address < tex_info_buffer.address + tex_info_buffer.size);
boost::optional<VAddr> tex_address_cpu = memory_manager.GpuToCpuAddress(tex_info_address);
Texture::TextureHandle tex_handle{Memory::Read32(*tex_address_cpu)};
Texture::FullTextureInfo tex_info{};
tex_info.index = static_cast<u32>(offset);
// Load the TIC data.
if (tex_handle.tic_id != 0) {
tex_info.enabled = true;
auto tic_entry = GetTICEntry(tex_handle.tic_id);
// TODO(Subv): Workaround for BitField's move constructor being deleted.
std::memcpy(&tex_info.tic, &tic_entry, sizeof(tic_entry));
}
// Load the TSC data
if (tex_handle.tsc_id != 0) {
auto tsc_entry = GetTSCEntry(tex_handle.tsc_id);
// TODO(Subv): Workaround for BitField's move constructor being deleted.
std::memcpy(&tex_info.tsc, &tsc_entry, sizeof(tsc_entry));
}
return tex_info;
}
u32 Maxwell3D::GetRegisterValue(u32 method) const {
ASSERT_MSG(method < Regs::NUM_REGS, "Invalid Maxwell3D register");
return regs.reg_array[method];

3
src/video_core/engines/maxwell_3d.h
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@ -664,6 +664,9 @@ public:
/// Returns a list of enabled textures for the specified shader stage.
std::vector<Texture::FullTextureInfo> GetStageTextures(Regs::ShaderStage stage) const;
/// Returns the texture information for a specific texture in a specific shader stage.
Texture::FullTextureInfo GetStageTexture(Regs::ShaderStage stage, size_t offset) const;
/// Returns whether the specified shader stage is enabled or not.
bool IsShaderStageEnabled(Regs::ShaderStage stage) const;

83
src/video_core/renderer_opengl/gl_rasterizer.cpp
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@ -196,8 +196,10 @@ void RasterizerOpenGL::SetupShaders(u8* buffer_ptr, GLintptr buffer_offset) {
auto& gpu = Core::System().GetInstance().GPU().Maxwell3D();
ASSERT_MSG(!gpu.regs.shader_config[0].enable, "VertexA is unsupported!");
// Next available bindpoint to use when uploading the const buffers to the GLSL shaders.
// Next available bindpoints to use when uploading the const buffers and textures to the GLSL
// shaders.
u32 current_constbuffer_bindpoint = 0;
u32 current_texture_bindpoint = 0;
for (unsigned index = 1; index < Maxwell::MaxShaderProgram; ++index) {
auto& shader_config = gpu.regs.shader_config[index];
@ -258,6 +260,11 @@ void RasterizerOpenGL::SetupShaders(u8* buffer_ptr, GLintptr buffer_offset) {
current_constbuffer_bindpoint =
SetupConstBuffers(static_cast<Maxwell::ShaderStage>(stage), gl_stage_program,
current_constbuffer_bindpoint, shader_resources.const_buffer_entries);
// Configure the textures for this shader stage.
current_texture_bindpoint =
SetupTextures(static_cast<Maxwell::ShaderStage>(stage), gl_stage_program,
current_texture_bindpoint, shader_resources.texture_samplers);
}
shader_program_manager->UseTrivialGeometryShader();
@ -341,9 +348,6 @@ void RasterizerOpenGL::DrawArrays() {
// TODO(bunnei): Sync framebuffer_scale uniform here
// TODO(bunnei): Sync scissorbox uniform(s) here
// Sync and bind the texture surfaces
BindTextures();
// Viewport can have negative offsets or larger dimensions than our framebuffer sub-rect. Enable
// scissor test to prevent drawing outside of the framebuffer region
state.scissor.enabled = true;
@ -447,39 +451,6 @@ void RasterizerOpenGL::DrawArrays() {
}
}
void RasterizerOpenGL::BindTextures() {
using Regs = Tegra::Engines::Maxwell3D::Regs;
auto& maxwell3d = Core::System::GetInstance().GPU().Get3DEngine();
// Each Maxwell shader stage can have an arbitrary number of textures, but we're limited to a
// certain number in OpenGL. We try to only use the minimum amount of host textures by not
// keeping a 1:1 relation between guest texture ids and host texture ids, ie, guest texture id 8
// can be host texture id 0 if it's the only texture used in the guest shader program.
u32 host_texture_index = 0;
for (u32 stage = 0; stage < Regs::MaxShaderStage; ++stage) {
ASSERT(host_texture_index < texture_samplers.size());
const auto textures = maxwell3d.GetStageTextures(static_cast<Regs::ShaderStage>(stage));
for (unsigned texture_index = 0; texture_index < textures.size(); ++texture_index) {
const auto& texture = textures[texture_index];
if (texture.enabled) {
texture_samplers[host_texture_index].SyncWithConfig(texture.tsc);
Surface surface = res_cache.GetTextureSurface(texture);
if (surface != nullptr) {
state.texture_units[host_texture_index].texture_2d = surface->texture.handle;
} else {
// Can occur when texture addr is null or its memory is unmapped/invalid
state.texture_units[texture_index].texture_2d = 0;
}
++host_texture_index;
} else {
state.texture_units[texture_index].texture_2d = 0;
}
}
}
}
void RasterizerOpenGL::NotifyMaxwellRegisterChanged(u32 method) {
const auto& regs = Core::System().GetInstance().GPU().Maxwell3D().regs;
switch (method) {
@ -674,6 +645,44 @@ u32 RasterizerOpenGL::SetupConstBuffers(Maxwell::ShaderStage stage, GLuint progr
return current_bindpoint + entries.size();
}
u32 RasterizerOpenGL::SetupTextures(Maxwell::ShaderStage stage, GLuint program, u32 current_unit,
const std::vector<GLShader::SamplerEntry>& entries) {
auto& gpu = Core::System::GetInstance().GPU();
auto& maxwell3d = gpu.Get3DEngine();
ASSERT_MSG(maxwell3d.IsShaderStageEnabled(stage),
"Attempted to upload textures of disabled shader stage");
ASSERT_MSG(current_unit + entries.size() <= std::size(state.texture_units),
"Exceeded the number of active textures.");
for (u32 bindpoint = 0; bindpoint < entries.size(); ++bindpoint) {
const auto& entry = entries[bindpoint];
u32 current_bindpoint = current_unit + bindpoint;
// Bind the uniform to the sampler.
GLint uniform = glGetUniformLocation(program, entry.GetName().c_str());
ASSERT(uniform != -1);
glProgramUniform1i(program, uniform, current_bindpoint);
const auto texture = maxwell3d.GetStageTexture(entry.GetStage(), entry.GetOffset());
ASSERT(texture.enabled);
texture_samplers[current_bindpoint].SyncWithConfig(texture.tsc);
Surface surface = res_cache.GetTextureSurface(texture);
if (surface != nullptr) {
state.texture_units[current_bindpoint].texture_2d = surface->texture.handle;
} else {
// Can occur when texture addr is null or its memory is unmapped/invalid
state.texture_units[current_bindpoint].texture_2d = 0;
}
}
state.Apply();
return current_unit + entries.size();
}
void RasterizerOpenGL::BindFramebufferSurfaces(const Surface& color_surface,
const Surface& depth_surface, bool has_stencil) {
state.draw.draw_framebuffer = framebuffer.handle;

14
src/video_core/renderer_opengl/gl_rasterizer.h
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@ -80,9 +80,6 @@ private:
void BindFramebufferSurfaces(const Surface& color_surface, const Surface& depth_surface,
bool has_stencil);
/// Binds the required textures to OpenGL before drawing a batch.
void BindTextures();
/*
* Configures the current constbuffers to use for the draw command.
* @param stage The shader stage to configure buffers for.
@ -95,6 +92,17 @@ private:
u32 current_bindpoint,
const std::vector<GLShader::ConstBufferEntry>& entries);
/*
* Configures the current textures to use for the draw command.
* @param stage The shader stage to configure textures for.
* @param program The OpenGL program object that contains the specified stage.
* @param current_unit The offset at which to start counting unused texture units.
* @param entries Vector describing the textures that are actually used in the guest shader.
* @returns The next available bindpoint for use in the next shader stage.
*/
u32 SetupTextures(Tegra::Engines::Maxwell3D::Regs::ShaderStage stage, GLuint program,
u32 current_unit, const std::vector<GLShader::SamplerEntry>& entries);
/// Syncs the viewport to match the guest state
void SyncViewport(const MathUtil::Rectangle<u32>& surfaces_rect, u16 res_scale);

45
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -425,6 +425,14 @@ public:
++const_buffer_layout;
}
declarations.AddNewLine();
// Append the sampler2D array for the used textures.
size_t num_samplers = GetSamplers().size();
if (num_samplers > 0) {
declarations.AddLine("uniform sampler2D " + SamplerEntry::GetArrayName(stage) + '[' +
std::to_string(num_samplers) + "];");
declarations.AddNewLine();
}
}
/// Returns a list of constant buffer declarations
@ -435,6 +443,32 @@ public:
return result;
}
/// Returns a list of samplers used in the shader
std::vector<SamplerEntry> GetSamplers() const {
return used_samplers;
}
/// Returns the GLSL sampler used for the input shader sampler, and creates a new one if
/// necessary.
std::string AccessSampler(const Sampler& sampler) {
size_t offset = static_cast<size_t>(sampler.index.Value());
// If this sampler has already been used, return the existing mapping.
auto itr =
std::find_if(used_samplers.begin(), used_samplers.end(),
[&](const SamplerEntry& entry) { return entry.GetOffset() == offset; });
if (itr != used_samplers.end()) {
return itr->GetName();
}
// Otherwise create a new mapping for this sampler
size_t next_index = used_samplers.size();
SamplerEntry entry{stage, offset, next_index};
used_samplers.emplace_back(entry);
return entry.GetName();
}
private:
/// Build GLSL conversion function, e.g. floatBitsToInt, intBitsToFloat, etc.
const std::string GetGLSLConversionFunc(GLSLRegister::Type src, GLSLRegister::Type dest) const {
@ -544,6 +578,7 @@ private:
std::set<Attribute::Index> declr_input_attribute;
std::set<Attribute::Index> declr_output_attribute;
std::array<ConstBufferEntry, Maxwell3D::Regs::MaxConstBuffers> declr_const_buffers;
std::vector<SamplerEntry> used_samplers;
const Maxwell3D::Regs::ShaderStage& stage;
};
@ -563,7 +598,7 @@ public:
/// Returns entries in the shader that are useful for external functions
ShaderEntries GetEntries() const {
return {regs.GetConstBuffersDeclarations()};
return {regs.GetConstBuffersDeclarations(), regs.GetSamplers()};
}
private:
@ -585,12 +620,8 @@ private:
}
/// Generates code representing a texture sampler.
std::string GetSampler(const Sampler& sampler) const {
// TODO(Subv): Support more than just texture sampler 0
ASSERT_MSG(sampler.index == Sampler::Index::Sampler_0, "unsupported");
const unsigned index{static_cast<unsigned>(sampler.index.Value()) -
static_cast<unsigned>(Sampler::Index::Sampler_0)};
return "tex[" + std::to_string(index) + ']';
std::string GetSampler(const Sampler& sampler) {
return regs.AccessSampler(sampler);
}
/**

2
src/video_core/renderer_opengl/gl_shader_gen.cpp
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@ -62,8 +62,6 @@ layout (std140) uniform fs_config {
vec4 viewport_flip;
};
uniform sampler2D tex[32];
void main() {
exec_shader();
}

40
src/video_core/renderer_opengl/gl_shader_gen.h
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@ -56,8 +56,48 @@ private:
Maxwell::ShaderStage stage;
};
class SamplerEntry {
using Maxwell = Tegra::Engines::Maxwell3D::Regs;
public:
SamplerEntry(Maxwell::ShaderStage stage, size_t offset, size_t index)
: offset(offset), stage(stage), sampler_index(index) {}
size_t GetOffset() const {
return offset;
}
size_t GetIndex() const {
return sampler_index;
}
Maxwell::ShaderStage GetStage() const {
return stage;
}
std::string GetName() const {
return std::string(TextureSamplerNames[static_cast<size_t>(stage)]) + '[' +
std::to_string(sampler_index) + ']';
}
static std::string GetArrayName(Maxwell::ShaderStage stage) {
return TextureSamplerNames[static_cast<size_t>(stage)];
}
private:
static constexpr std::array<const char*, Maxwell::MaxShaderStage> TextureSamplerNames = {
"tex_vs", "tex_tessc", "tex_tesse", "tex_gs", "tex_fs",
};
/// Offset in TSC memory from which to read the sampler object, as specified by the sampling
/// instruction.
size_t offset;
Maxwell::ShaderStage stage; ///< Shader stage where this sampler was used.
size_t sampler_index; ///< Value used to index into the generated GLSL sampler array.
};
struct ShaderEntries {
std::vector<ConstBufferEntry> const_buffer_entries;
std::vector<SamplerEntry> texture_samplers;
};
using ProgramResult = std::pair<std::string, ShaderEntries>;

19
src/video_core/renderer_opengl/gl_shader_manager.cpp
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@ -32,25 +32,6 @@ void SetShaderUniformBlockBindings(GLuint shader) {
sizeof(MaxwellUniformData));
}
void SetShaderSamplerBindings(GLuint shader) {
OpenGLState cur_state = OpenGLState::GetCurState();
GLuint old_program = std::exchange(cur_state.draw.shader_program, shader);
cur_state.Apply();
// Set the texture samplers to correspond to different texture units
for (u32 texture = 0; texture < NumTextureSamplers; ++texture) {
// Set the texture samplers to correspond to different texture units
std::string uniform_name = "tex[" + std::to_string(texture) + "]";
GLint uniform_tex = glGetUniformLocation(shader, uniform_name.c_str());
if (uniform_tex != -1) {
glUniform1i(uniform_tex, TextureUnits::MaxwellTexture(texture).id);
}
}
cur_state.draw.shader_program = old_program;
cur_state.Apply();
}
} // namespace Impl
void MaxwellUniformData::SetFromRegs(const Maxwell3D::State::ShaderStageInfo& shader_stage) {

1
src/video_core/renderer_opengl/gl_shader_manager.h
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@ -45,7 +45,6 @@ public:
shader.Create(program_result.first.c_str(), type);
program.Create(true, shader.handle);
Impl::SetShaderUniformBlockBindings(program.handle);
Impl::SetShaderSamplerBindings(program.handle);
entries = program_result.second;
}
GLuint GetHandle() const {