From d621e96d0de212cc16897eadf71e8a1b2e1eb5dc Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 23 May 2021 04:28:34 -0300
Subject: shader: Initial OpenGL implementation

---
 src/video_core/renderer_opengl/gl_buffer_cache.h | 40 ++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 3 deletions(-)

(limited to 'src/video_core/renderer_opengl/gl_buffer_cache.h')

diff --git a/src/video_core/renderer_opengl/gl_buffer_cache.h b/src/video_core/renderer_opengl/gl_buffer_cache.h
index ddcce5e97..4986c65fd 100644
--- a/src/video_core/renderer_opengl/gl_buffer_cache.h
+++ b/src/video_core/renderer_opengl/gl_buffer_cache.h
@@ -32,6 +32,8 @@ public:
 
     void MakeResident(GLenum access) noexcept;
 
+    [[nodiscard]] GLuint View(u32 offset, u32 size, VideoCore::Surface::PixelFormat format);
+
     [[nodiscard]] GLuint64EXT HostGpuAddr() const noexcept {
         return address;
     }
@@ -41,9 +43,17 @@ public:
     }
 
 private:
+    struct BufferView {
+        u32 offset;
+        u32 size;
+        VideoCore::Surface::PixelFormat format;
+        OGLTexture texture;
+    };
+
     GLuint64EXT address = 0;
     OGLBuffer buffer;
     GLenum current_residency_access = GL_NONE;
+    std::vector<BufferView> views;
 };
 
 class BufferCacheRuntime {
@@ -75,13 +85,19 @@ public:
 
     void BindTransformFeedbackBuffer(u32 index, Buffer& buffer, u32 offset, u32 size);
 
+    void BindTextureBuffer(Buffer& buffer, u32 offset, u32 size,
+                           VideoCore::Surface::PixelFormat format);
+
+    void BindImageBuffer(Buffer& buffer, u32 offset, u32 size,
+                         VideoCore::Surface::PixelFormat format);
+
     void BindFastUniformBuffer(size_t stage, u32 binding_index, u32 size) {
         if (use_assembly_shaders) {
             const GLuint handle = fast_uniforms[stage][binding_index].handle;
             const GLsizeiptr gl_size = static_cast<GLsizeiptr>(size);
             glBindBufferRangeNV(PABO_LUT[stage], binding_index, handle, 0, gl_size);
         } else {
-            const GLuint base_binding = device.GetBaseBindings(stage).uniform_buffer;
+            const GLuint base_binding = graphics_base_uniform_bindings[stage];
             const GLuint binding = base_binding + binding_index;
             glBindBufferRange(GL_UNIFORM_BUFFER, binding,
                               fast_uniforms[stage][binding_index].handle, 0,
@@ -103,7 +119,7 @@ public:
 
     std::span<u8> BindMappedUniformBuffer(size_t stage, u32 binding_index, u32 size) noexcept {
         const auto [mapped_span, offset] = stream_buffer->Request(static_cast<size_t>(size));
-        const GLuint base_binding = device.GetBaseBindings(stage).uniform_buffer;
+        const GLuint base_binding = graphics_base_uniform_bindings[stage];
         const GLuint binding = base_binding + binding_index;
         glBindBufferRange(GL_UNIFORM_BUFFER, binding, stream_buffer->Handle(),
                           static_cast<GLintptr>(offset), static_cast<GLsizeiptr>(size));
@@ -118,6 +134,19 @@ public:
         return has_fast_buffer_sub_data;
     }
 
+    void SetBaseUniformBindings(const std::array<GLuint, 5>& bindings) {
+        graphics_base_uniform_bindings = bindings;
+    }
+
+    void SetBaseStorageBindings(const std::array<GLuint, 5>& bindings) {
+        graphics_base_storage_bindings = bindings;
+    }
+
+    void SetImagePointers(GLuint* texture_handles_, GLuint* image_handles_) {
+        texture_handles = texture_handles_;
+        image_handles = image_handles_;
+    }
+
 private:
     static constexpr std::array PABO_LUT{
         GL_VERTEX_PROGRAM_PARAMETER_BUFFER_NV,          GL_TESS_CONTROL_PROGRAM_PARAMETER_BUFFER_NV,
@@ -133,6 +162,11 @@ private:
 
     u32 max_attributes = 0;
 
+    std::array<GLuint, 5> graphics_base_uniform_bindings{};
+    std::array<GLuint, 5> graphics_base_storage_bindings{};
+    GLuint* texture_handles = nullptr;
+    GLuint* image_handles = nullptr;
+
     std::optional<StreamBuffer> stream_buffer;
 
     std::array<std::array<OGLBuffer, VideoCommon::NUM_GRAPHICS_UNIFORM_BUFFERS>,
@@ -155,8 +189,8 @@ struct BufferCacheParams {
     static constexpr bool HAS_FULL_INDEX_AND_PRIMITIVE_SUPPORT = true;
     static constexpr bool NEEDS_BIND_UNIFORM_INDEX = true;
     static constexpr bool NEEDS_BIND_STORAGE_INDEX = true;
-    static constexpr bool NEEDS_BIND_TEXTURE_BUFFER_INDEX = true;
     static constexpr bool USE_MEMORY_MAPS = false;
+    static constexpr bool SEPARATE_IMAGE_BUFFER_BINDINGS = true;
 };
 
 using BufferCache = VideoCommon::BufferCache<BufferCacheParams>;
-- 
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