glasm: Set transform feedback state

5 files changed, 132 insertions, 113 deletions

diff --git a/src/video_core/renderer_opengl/gl_graphics_program.cpp b/src/video_core/renderer_opengl/gl_graphics_program.cpp
index b5d75aa13..9677a3ed6 100644
--- a/src/video_core/renderer_opengl/gl_graphics_program.cpp
+++ b/src/video_core/renderer_opengl/gl_graphics_program.cpp
@@ -12,7 +12,7 @@
 #include "video_core/texture_cache/texture_cache.h"
 
 namespace OpenGL {
-
+namespace {
 using Shader::ImageBufferDescriptor;
 using Tegra::Texture::TexturePair;
 using VideoCommon::ImageId;
@@ -20,6 +20,35 @@ using VideoCommon::ImageId;
 constexpr u32 MAX_TEXTURES = 64;
 constexpr u32 MAX_IMAGES = 8;
 
+/// 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={}", index);
+    return {GL_POSITION, 0};
+}
+} // Anonymous namespace
+
 size_t GraphicsProgramKey::Hash() const noexcept {
     return static_cast<size_t>(Common::CityHash64(reinterpret_cast<const char*>(this), Size()));
 }
@@ -34,7 +63,8 @@ GraphicsProgram::GraphicsProgram(TextureCache& texture_cache_, BufferCache& buff
                                  ProgramManager& program_manager_, StateTracker& state_tracker_,
                                  OGLProgram program_,
                                  std::array<OGLAssemblyProgram, 5> assembly_programs_,
-                                 const std::array<const Shader::Info*, 5>& infos)
+                                 const std::array<const Shader::Info*, 5>& infos,
+                                 const VideoCommon::TransformFeedbackState* xfb_state)
     : texture_cache{texture_cache_}, buffer_cache{buffer_cache_},
       gpu_memory{gpu_memory_}, maxwell3d{maxwell3d_}, program_manager{program_manager_},
       state_tracker{state_tracker_}, program{std::move(program_)}, assembly_programs{std::move(
@@ -74,6 +104,10 @@ GraphicsProgram::GraphicsProgram(TextureCache& texture_cache_, BufferCache& buff
     }
     ASSERT(num_textures <= MAX_TEXTURES);
     ASSERT(num_images <= MAX_IMAGES);
+
+    if (assembly_programs[0].handle != 0 && xfb_state) {
+        GenerateTransformFeedbackState(*xfb_state);
+    }
 }
 
 struct Spec {
@@ -302,4 +336,56 @@ void GraphicsProgram::Configure(bool is_indexed) {
     }
 }
 
+void GraphicsProgram::GenerateTransformFeedbackState(
+    const VideoCommon::TransformFeedbackState& xfb_state) {
+    // TODO(Rodrigo): Inject SKIP_COMPONENTS*_NV when required. An unimplemented message will signal
+    // when this is required.
+    const auto& regs{maxwell3d.regs};
+
+    GLint* cursor{xfb_attribs.data()};
+    GLint* current_stream{xfb_streams.data()};
+
+    for (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 != xfb_streams.data()) {
+            // When stepping one stream, push the expected token
+            cursor[0] = GL_NEXT_BUFFER_NV;
+            cursor[1] = 0;
+            cursor[2] = 0;
+            cursor += XFB_ENTRY_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 += XFB_ENTRY_STRIDE;
+        }
+    }
+    num_xfb_attribs = static_cast<GLsizei>((cursor - xfb_attribs.data()) / XFB_ENTRY_STRIDE);
+    num_xfb_strides = static_cast<GLsizei>(current_stream - xfb_streams.data());
+}
+
+void GraphicsProgram::ConfigureTransformFeedbackImpl() const {
+    glTransformFeedbackStreamAttribsNV(num_xfb_attribs, xfb_attribs.data(), num_xfb_strides,
+                                       xfb_streams.data(), GL_INTERLEAVED_ATTRIBS);
+}
+
 } // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_graphics_program.h b/src/video_core/renderer_opengl/gl_graphics_program.h
index 18292bb16..53a57ede5 100644
--- a/src/video_core/renderer_opengl/gl_graphics_program.h
+++ b/src/video_core/renderer_opengl/gl_graphics_program.h
@@ -16,6 +16,7 @@
 #include "video_core/renderer_opengl/gl_buffer_cache.h"
 #include "video_core/renderer_opengl/gl_resource_manager.h"
 #include "video_core/renderer_opengl/gl_texture_cache.h"
+#include "video_core/transform_feedback.h"
 
 namespace OpenGL {
 
@@ -24,16 +25,6 @@ class ProgramManager;
 using Maxwell = Tegra::Engines::Maxwell3D::Regs;
 
 struct GraphicsProgramKey {
-    struct TransformFeedbackState {
-        struct Layout {
-            u32 stream;
-            u32 varying_count;
-            u32 stride;
-        };
-        std::array<Layout, Maxwell::NumTransformFeedbackBuffers> layouts;
-        std::array<std::array<u8, 128>, Maxwell::NumTransformFeedbackBuffers> varyings;
-    };
-
     std::array<u64, 6> unique_hashes;
     union {
         u32 raw;
@@ -45,7 +36,7 @@ struct GraphicsProgramKey {
         BitField<10, 1, u32> tessellation_clockwise;
     };
     std::array<u32, 3> padding;
-    TransformFeedbackState xfb_state;
+    VideoCommon::TransformFeedbackState xfb_state;
 
     size_t Hash() const noexcept;
 
@@ -75,11 +66,22 @@ public:
                              ProgramManager& program_manager_, StateTracker& state_tracker_,
                              OGLProgram program_,
                              std::array<OGLAssemblyProgram, 5> assembly_programs_,
-                             const std::array<const Shader::Info*, 5>& infos);
+                             const std::array<const Shader::Info*, 5>& infos,
+                             const VideoCommon::TransformFeedbackState* xfb_state);
 
     void Configure(bool is_indexed);
 
+    void ConfigureTransformFeedback() const {
+        if (num_xfb_attribs != 0) {
+            ConfigureTransformFeedbackImpl();
+        }
+    }
+
 private:
+    void GenerateTransformFeedbackState(const VideoCommon::TransformFeedbackState& xfb_state);
+
+    void ConfigureTransformFeedbackImpl() const;
+
     TextureCache& texture_cache;
     BufferCache& buffer_cache;
     Tegra::MemoryManager& gpu_memory;
@@ -96,6 +98,12 @@ private:
     std::array<u32, 5> base_storage_bindings{};
     std::array<u32, 5> num_texture_buffers{};
     std::array<u32, 5> num_image_buffers{};
+
+    static constexpr std::size_t XFB_ENTRY_STRIDE = 3;
+    GLsizei num_xfb_attribs{};
+    GLsizei num_xfb_strides{};
+    std::array<GLint, 128 * XFB_ENTRY_STRIDE * Maxwell::NumTransformFeedbackBuffers> xfb_attribs{};
+    std::array<GLint, Maxwell::NumTransformFeedbackBuffers> xfb_streams{};
 };
 
 } // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index 4834d58f0..51ff42ee9 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -51,37 +51,8 @@ MICROPROFILE_DEFINE(OpenGL_Blits, "OpenGL", "Blits", MP_RGB(128, 128, 192));
 MICROPROFILE_DEFINE(OpenGL_CacheManagement, "OpenGL", "Cache Management", MP_RGB(100, 255, 100));
 
 namespace {
-
 constexpr size_t NUM_SUPPORTED_VERTEX_ATTRIBUTES = 16;
 
-/// 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={}", index);
-    return {GL_POSITION, 0};
-}
-
 void oglEnable(GLenum cap, bool state) {
     (state ? glEnable : glDisable)(cap);
 }
@@ -253,7 +224,7 @@ void RasterizerOpenGL::Draw(bool is_indexed, bool is_instanced) {
     program->Configure(is_indexed);
 
     const GLenum primitive_mode = MaxwellToGL::PrimitiveTopology(maxwell3d.regs.draw.topology);
-    BeginTransformFeedback(primitive_mode);
+    BeginTransformFeedback(program, primitive_mode);
 
     const GLuint base_instance = static_cast<GLuint>(maxwell3d.regs.vb_base_instance);
     const GLsizei num_instances =
@@ -1025,68 +996,13 @@ void RasterizerOpenGL::SyncFramebufferSRGB() {
     oglEnable(GL_FRAMEBUFFER_SRGB, maxwell3d.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 = 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) {
+void RasterizerOpenGL::BeginTransformFeedback(GraphicsProgram* program, GLenum primitive_mode) {
     const auto& regs = maxwell3d.regs;
     if (regs.tfb_enabled == 0) {
         return;
     }
-    if (device.UseAssemblyShaders()) {
-        SyncTransformFeedback();
-    }
+    program->ConfigureTransformFeedback();
+
     UNIMPLEMENTED_IF(regs.IsShaderConfigEnabled(Maxwell::ShaderProgram::TesselationControl) ||
                      regs.IsShaderConfigEnabled(Maxwell::ShaderProgram::TesselationEval) ||
                      regs.IsShaderConfigEnabled(Maxwell::ShaderProgram::Geometry));
@@ -1100,11 +1016,9 @@ void RasterizerOpenGL::BeginTransformFeedback(GLenum primitive_mode) {
 }
 
 void RasterizerOpenGL::EndTransformFeedback() {
-    const auto& regs = maxwell3d.regs;
-    if (regs.tfb_enabled == 0) {
-        return;
+    if (maxwell3d.regs.tfb_enabled != 0) {
+        glEndTransformFeedback();
     }
-    glEndTransformFeedback();
 }
 
 AccelerateDMA::AccelerateDMA(BufferCache& buffer_cache_) : buffer_cache{buffer_cache_} {}
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index 2fdcbe4ba..08f509c19 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -193,12 +193,8 @@ private:
     /// Syncs vertex instances to match the guest state
     void SyncVertexInstances();
 
-    /// 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);
+    void BeginTransformFeedback(GraphicsProgram* program, GLenum primitive_mode);
 
     /// End a transform feedback
     void EndTransformFeedback();
diff --git a/src/video_core/renderer_opengl/gl_shader_cache.cpp b/src/video_core/renderer_opengl/gl_shader_cache.cpp
index b4f26dd74..0a0f1324f 100644
--- a/src/video_core/renderer_opengl/gl_shader_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_cache.cpp
@@ -254,6 +254,17 @@ Shader::RuntimeInfo MakeRuntimeInfo(const GraphicsProgramKey& key,
     }
     return info;
 }
+
+void SetXfbState(VideoCommon::TransformFeedbackState& state, const Maxwell& regs) {
+    std::ranges::transform(regs.tfb_layouts, state.layouts.begin(), [](const auto& layout) {
+        return VideoCommon::TransformFeedbackState::Layout{
+            .stream = layout.stream,
+            .varying_count = layout.varying_count,
+            .stride = layout.stride,
+        };
+    });
+    state.varyings = regs.tfb_varying_locs;
+}
 } // Anonymous namespace
 
 ShaderCache::ShaderCache(RasterizerOpenGL& rasterizer_, Core::Frontend::EmuWindow& emu_window_,
@@ -282,7 +293,10 @@ GraphicsProgram* ShaderCache::CurrentGraphicsProgram() {
     graphics_key.tessellation_primitive.Assign(regs.tess_mode.prim.Value());
     graphics_key.tessellation_spacing.Assign(regs.tess_mode.spacing.Value());
     graphics_key.tessellation_clockwise.Assign(regs.tess_mode.cw.Value());
-
+    graphics_key.xfb_enabled.Assign(regs.tfb_enabled != 0 ? 1 : 0);
+    if (graphics_key.xfb_enabled) {
+        SetXfbState(graphics_key.xfb_state, regs);
+    }
     const auto [pair, is_new]{graphics_cache.try_emplace(graphics_key)};
     auto& program{pair->second};
     if (is_new) {
@@ -368,7 +382,8 @@ std::unique_ptr<GraphicsProgram> ShaderCache::CreateGraphicsProgram(
     }
     return std::make_unique<GraphicsProgram>(
         texture_cache, buffer_cache, gpu_memory, maxwell3d, program_manager, state_tracker,
-        std::move(source_program), std::move(assembly_programs), infos);
+        std::move(source_program), std::move(assembly_programs), infos,
+        key.xfb_enabled != 0 ? &key.xfb_state : nullptr);
 }
 
 std::unique_ptr<ComputeProgram> ShaderCache::CreateComputeProgram(