Merge pull request #4040 from ReinUsesLisp/nv-transform-feedback

gl_rasterizer: Use NV_transform_feedback for XFB on assembly shaders
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bunnei 2020-06-08 16:18:33 -04:00 committed by GitHub
commit 3626254f48
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3 changed files with 96 additions and 1 deletions

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@ -214,7 +214,8 @@ Device::Device()
has_precise_bug = TestPreciseBug();
has_fast_buffer_sub_data = is_nvidia && !disable_fast_buffer_sub_data;
use_assembly_shaders = Settings::values.use_assembly_shaders && GLAD_GL_NV_gpu_program5 &&
GLAD_GL_NV_compute_program5;
GLAD_GL_NV_compute_program5 && GLAD_GL_NV_transform_feedback &&
GLAD_GL_NV_transform_feedback2;
LOG_INFO(Render_OpenGL, "Renderer_VariableAOFFI: {}", has_variable_aoffi);
LOG_INFO(Render_OpenGL, "Renderer_ComponentIndexingBug: {}", has_component_indexing_bug);

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@ -93,6 +93,34 @@ std::size_t GetConstBufferSize(const Tegra::Engines::ConstBufferInfo& buffer,
return buffer.size;
}
/// Translates hardware transform feedback indices
/// @param location Hardware location
/// @return Pair of ARB_transform_feedback3 token stream first and third arguments
/// @note Read https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_transform_feedback3.txt
std::pair<GLint, GLint> TransformFeedbackEnum(u8 location) {
const u8 index = location / 4;
if (index >= 8 && index <= 39) {
return {GL_GENERIC_ATTRIB_NV, index - 8};
}
if (index >= 48 && index <= 55) {
return {GL_TEXTURE_COORD_NV, index - 48};
}
switch (index) {
case 7:
return {GL_POSITION, 0};
case 40:
return {GL_PRIMARY_COLOR_NV, 0};
case 41:
return {GL_SECONDARY_COLOR_NV, 0};
case 42:
return {GL_BACK_PRIMARY_COLOR_NV, 0};
case 43:
return {GL_BACK_SECONDARY_COLOR_NV, 0};
}
UNIMPLEMENTED_MSG("index={}", static_cast<int>(index));
return {GL_POSITION, 0};
}
void oglEnable(GLenum cap, bool state) {
(state ? glEnable : glDisable)(cap);
}
@ -1547,12 +1575,70 @@ void RasterizerOpenGL::SyncFramebufferSRGB() {
oglEnable(GL_FRAMEBUFFER_SRGB, gpu.regs.framebuffer_srgb);
}
void RasterizerOpenGL::SyncTransformFeedback() {
// TODO(Rodrigo): Inject SKIP_COMPONENTS*_NV when required. An unimplemented message will signal
// when this is required.
const auto& regs = system.GPU().Maxwell3D().regs;
static constexpr std::size_t STRIDE = 3;
std::array<GLint, 128 * STRIDE * Maxwell::NumTransformFeedbackBuffers> attribs;
std::array<GLint, Maxwell::NumTransformFeedbackBuffers> streams;
GLint* cursor = attribs.data();
GLint* current_stream = streams.data();
for (std::size_t feedback = 0; feedback < Maxwell::NumTransformFeedbackBuffers; ++feedback) {
const auto& layout = regs.tfb_layouts[feedback];
UNIMPLEMENTED_IF_MSG(layout.stride != layout.varying_count * 4, "Stride padding");
if (layout.varying_count == 0) {
continue;
}
*current_stream = static_cast<GLint>(feedback);
if (current_stream != streams.data()) {
// When stepping one stream, push the expected token
cursor[0] = GL_NEXT_BUFFER_NV;
cursor[1] = 0;
cursor[2] = 0;
cursor += STRIDE;
}
++current_stream;
const auto& locations = regs.tfb_varying_locs[feedback];
std::optional<u8> current_index;
for (u32 offset = 0; offset < layout.varying_count; ++offset) {
const u8 location = locations[offset];
const u8 index = location / 4;
if (current_index == index) {
// Increase number of components of the previous attachment
++cursor[-2];
continue;
}
current_index = index;
std::tie(cursor[0], cursor[2]) = TransformFeedbackEnum(location);
cursor[1] = 1;
cursor += STRIDE;
}
}
const GLsizei num_attribs = static_cast<GLsizei>((cursor - attribs.data()) / STRIDE);
const GLsizei num_strides = static_cast<GLsizei>(current_stream - streams.data());
glTransformFeedbackStreamAttribsNV(num_attribs, attribs.data(), num_strides, streams.data(),
GL_INTERLEAVED_ATTRIBS);
}
void RasterizerOpenGL::BeginTransformFeedback(GLenum primitive_mode) {
const auto& regs = system.GPU().Maxwell3D().regs;
if (regs.tfb_enabled == 0) {
return;
}
if (device.UseAssemblyShaders()) {
SyncTransformFeedback();
}
UNIMPLEMENTED_IF(regs.IsShaderConfigEnabled(Maxwell::ShaderProgram::TesselationControl) ||
regs.IsShaderConfigEnabled(Maxwell::ShaderProgram::TesselationEval) ||
regs.IsShaderConfigEnabled(Maxwell::ShaderProgram::Geometry));
@ -1579,6 +1665,10 @@ void RasterizerOpenGL::BeginTransformFeedback(GLenum primitive_mode) {
static_cast<GLsizeiptr>(size));
}
// We may have to call BeginTransformFeedbackNV here since they seem to call different
// implementations on Nvidia's driver (the pointer is different) but we are using
// ARB_transform_feedback3 features with NV_transform_feedback interactions and the ARB
// extension doesn't define BeginTransformFeedback (without NV) interactions. It just works.
glBeginTransformFeedback(GL_POINTS);
}

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@ -202,6 +202,10 @@ private:
/// Syncs the framebuffer sRGB state to match the guest state
void SyncFramebufferSRGB();
/// Syncs transform feedback state to match guest state
/// @note Only valid on assembly shaders
void SyncTransformFeedback();
/// Begin a transform feedback
void BeginTransformFeedback(GLenum primitive_mode);