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-rw-r--r--src/video_core/renderer_opengl/gl_device.cpp3
-rw-r--r--src/video_core/renderer_opengl/gl_rasterizer.cpp90
-rw-r--r--src/video_core/renderer_opengl/gl_rasterizer.h4
3 files changed, 96 insertions, 1 deletions
diff --git a/src/video_core/renderer_opengl/gl_device.cpp b/src/video_core/renderer_opengl/gl_device.cpp
index b772c37d9..8b424e2cb 100644
--- a/src/video_core/renderer_opengl/gl_device.cpp
+++ b/src/video_core/renderer_opengl/gl_device.cpp
@@ -206,7 +206,8 @@ Device::Device()
has_precise_bug = TestPreciseBug();
has_fast_buffer_sub_data = is_nvidia;
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);
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index 55e79aaf6..f802fd384 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -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);
}
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index f5dc56a0e..7abc8fdbd 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -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);