6 files changed, 140 insertions, 4 deletions

diff --git a/src/video_core/renderer_opengl/gl_global_cache.cpp b/src/video_core/renderer_opengl/gl_global_cache.cpp
index 7992b82c4..c7f32feaa 100644
--- a/src/video_core/renderer_opengl/gl_global_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_global_cache.cpp
@@ -4,8 +4,13 @@
 
 #include <glad/glad.h>
 
+#include "common/assert.h"
+#include "common/logging/log.h"
+#include "core/core.h"
+#include "core/memory.h"
 #include "video_core/renderer_opengl/gl_global_cache.h"
 #include "video_core/renderer_opengl/gl_rasterizer.h"
+#include "video_core/renderer_opengl/gl_shader_decompiler.h"
 #include "video_core/renderer_opengl/utils.h"
 
 namespace OpenGL {
@@ -18,7 +23,72 @@ CachedGlobalRegion::CachedGlobalRegion(VAddr addr, u32 size) : addr{addr}, size{
     LabelGLObject(GL_BUFFER, buffer.handle, addr, "GlobalMemory");
 }
 
+void CachedGlobalRegion::Reload(u32 size_) {
+    constexpr auto max_size = static_cast<u32>(RasterizerOpenGL::MaxGlobalMemorySize);
+
+    size = size_;
+    if (size > max_size) {
+        size = max_size;
+        LOG_CRITICAL(HW_GPU, "Global region size {} exceeded the expected size {}!", size_,
+                     max_size);
+    }
+
+    // TODO(Rodrigo): Get rid of Memory::GetPointer with a staging buffer
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, buffer.handle);
+    glBufferData(GL_SHADER_STORAGE_BUFFER, size, Memory::GetPointer(addr), GL_DYNAMIC_DRAW);
+}
+
+GlobalRegion GlobalRegionCacheOpenGL::TryGetReservedGlobalRegion(VAddr addr, u32 size) const {
+    const auto search{reserve.find(addr)};
+    if (search == reserve.end()) {
+        return {};
+    }
+    return search->second;
+}
+
+GlobalRegion GlobalRegionCacheOpenGL::GetUncachedGlobalRegion(VAddr addr, u32 size) {
+    GlobalRegion region{TryGetReservedGlobalRegion(addr, size)};
+    if (!region) {
+        // No reserved surface available, create a new one and reserve it
+        region = std::make_shared<CachedGlobalRegion>(addr, size);
+        ReserveGlobalRegion(region);
+    }
+    region->Reload(size);
+    return region;
+}
+
+void GlobalRegionCacheOpenGL::ReserveGlobalRegion(const GlobalRegion& region) {
+    reserve[region->GetAddr()] = region;
+}
+
 GlobalRegionCacheOpenGL::GlobalRegionCacheOpenGL(RasterizerOpenGL& rasterizer)
     : RasterizerCache{rasterizer} {}
 
+GlobalRegion GlobalRegionCacheOpenGL::GetGlobalRegion(
+    const GLShader::GlobalMemoryEntry& global_region,
+    Tegra::Engines::Maxwell3D::Regs::ShaderStage stage) {
+
+    auto& gpu{Core::System::GetInstance().GPU()};
+    const auto cbufs = gpu.Maxwell3D().state.shader_stages[static_cast<u64>(stage)];
+    const auto cbuf_addr = gpu.MemoryManager().GpuToCpuAddress(
+        cbufs.const_buffers[global_region.GetCbufIndex()].address + global_region.GetCbufOffset());
+    ASSERT(cbuf_addr);
+
+    const auto actual_addr_gpu = Memory::Read64(*cbuf_addr);
+    const auto size = Memory::Read32(*cbuf_addr + 8);
+    const auto actual_addr = gpu.MemoryManager().GpuToCpuAddress(actual_addr_gpu);
+    ASSERT(actual_addr);
+
+    // Look up global region in the cache based on address
+    GlobalRegion region = TryGet(*actual_addr);
+
+    if (!region) {
+        // No global region found - create a new one
+        region = GetUncachedGlobalRegion(*actual_addr, size);
+        Register(region);
+    }
+
+    return region;
+}
+
 } // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_global_cache.h b/src/video_core/renderer_opengl/gl_global_cache.h
index 406a735bc..37830bb7c 100644
--- a/src/video_core/renderer_opengl/gl_global_cache.h
+++ b/src/video_core/renderer_opengl/gl_global_cache.h
@@ -5,9 +5,13 @@
 #pragma once
 
 #include <memory>
+#include <unordered_map>
+
 #include <glad/glad.h>
 
+#include "common/assert.h"
 #include "common/common_types.h"
+#include "video_core/engines/maxwell_3d.h"
 #include "video_core/rasterizer_cache.h"
 #include "video_core/renderer_opengl/gl_resource_manager.h"
 
@@ -40,6 +44,9 @@ public:
         return buffer.handle;
     }
 
+    /// Reloads the global region from guest memory
+    void Reload(u32 size_);
+
     // TODO(Rodrigo): When global memory is written (STG), implement flushing
     void Flush() override {
         UNIMPLEMENTED();
@@ -55,6 +62,17 @@ private:
 class GlobalRegionCacheOpenGL final : public RasterizerCache<GlobalRegion> {
 public:
     explicit GlobalRegionCacheOpenGL(RasterizerOpenGL& rasterizer);
+
+    /// Gets the current specified shader stage program
+    GlobalRegion GetGlobalRegion(const GLShader::GlobalMemoryEntry& descriptor,
+                                 Tegra::Engines::Maxwell3D::Regs::ShaderStage stage);
+
+private:
+    GlobalRegion TryGetReservedGlobalRegion(VAddr addr, u32 size) const;
+    GlobalRegion GetUncachedGlobalRegion(VAddr addr, u32 size);
+    void ReserveGlobalRegion(const GlobalRegion& region);
+
+    std::unordered_map<VAddr, GlobalRegion> reserve;
 };
 
 } // namespace OpenGL
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index 71829fee0..ca421ef28 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -300,6 +300,7 @@ void RasterizerOpenGL::SetupShaders(GLenum primitive_mode) {
     // Next available bindpoints to use when uploading the const buffers and textures to the GLSL
     // shaders. The constbuffer bindpoint starts after the shader stage configuration bind points.
     u32 current_constbuffer_bindpoint = Tegra::Engines::Maxwell3D::Regs::MaxShaderStage;
+    u32 current_gmem_bindpoint = 0;
     u32 current_texture_bindpoint = 0;
     std::array<bool, Maxwell::NumClipDistances> clip_distances{};
 
@@ -358,6 +359,10 @@ void RasterizerOpenGL::SetupShaders(GLenum primitive_mode) {
             SetupConstBuffers(static_cast<Maxwell::ShaderStage>(stage), shader, primitive_mode,
                               current_constbuffer_bindpoint);
 
+        // Configure global memory regions for this shader stage.
+        current_gmem_bindpoint = SetupGlobalRegions(static_cast<Maxwell::ShaderStage>(stage),
+                                                    shader, primitive_mode, current_gmem_bindpoint);
+
         // Configure the textures for this shader stage.
         current_texture_bindpoint = SetupTextures(static_cast<Maxwell::ShaderStage>(stage), shader,
                                                   primitive_mode, current_texture_bindpoint);
@@ -993,6 +998,23 @@ u32 RasterizerOpenGL::SetupConstBuffers(Maxwell::ShaderStage stage, Shader& shad
     return current_bindpoint + static_cast<u32>(entries.size());
 }
 
+u32 RasterizerOpenGL::SetupGlobalRegions(Maxwell::ShaderStage stage, Shader& shader,
+                                         GLenum primitive_mode, u32 current_bindpoint) {
+    for (const auto& global_region : shader->GetShaderEntries().global_memory_entries) {
+        const auto& region =
+            global_cache.GetGlobalRegion(global_region, static_cast<Maxwell::ShaderStage>(stage));
+        const GLuint block_index{shader->GetProgramResourceIndex(global_region)};
+        ASSERT(block_index != GL_INVALID_INDEX);
+
+        glBindBufferBase(GL_SHADER_STORAGE_BUFFER, current_bindpoint, region->GetBufferHandle());
+        glShaderStorageBlockBinding(shader->GetProgramHandle(primitive_mode), block_index,
+                                    current_bindpoint);
+        ++current_bindpoint;
+    }
+
+    return current_bindpoint;
+}
+
 u32 RasterizerOpenGL::SetupTextures(Maxwell::ShaderStage stage, Shader& shader,
                                     GLenum primitive_mode, u32 current_unit) {
     MICROPROFILE_SCOPE(OpenGL_Texture);
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index 21c51f874..57ab2f627 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -138,6 +138,16 @@ private:
                           GLenum primitive_mode, u32 current_bindpoint);
 
     /**
+     * Configures the current global memory regions to use for the draw command.
+     * @param stage The shader stage to configure buffers for.
+     * @param shader The shader object that contains the specified stage.
+     * @param current_bindpoint The offset at which to start counting new buffer bindpoints.
+     * @returns The next available bindpoint for use in the next shader stage.
+     */
+    u32 SetupGlobalRegions(Tegra::Engines::Maxwell3D::Regs::ShaderStage stage, Shader& shader,
+                           GLenum primitive_mode, u32 current_bindpoint);
+
+    /**
      * Configures the current textures to use for the draw command.
      * @param stage The shader stage to configure textures for.
      * @param shader The shader object that contains the specified stage.
diff --git a/src/video_core/renderer_opengl/gl_shader_cache.cpp b/src/video_core/renderer_opengl/gl_shader_cache.cpp
index b3aca39af..54ec23f3a 100644
--- a/src/video_core/renderer_opengl/gl_shader_cache.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_cache.cpp
@@ -108,11 +108,23 @@ CachedShader::CachedShader(VAddr addr, Maxwell::ShaderProgram program_type)
 }
 
 GLuint CachedShader::GetProgramResourceIndex(const GLShader::ConstBufferEntry& buffer) {
-    const auto search{resource_cache.find(buffer.GetHash())};
-    if (search == resource_cache.end()) {
+    const auto search{cbuf_resource_cache.find(buffer.GetHash())};
+    if (search == cbuf_resource_cache.end()) {
         const GLuint index{
             glGetProgramResourceIndex(program.handle, GL_UNIFORM_BLOCK, buffer.GetName().c_str())};
-        resource_cache[buffer.GetHash()] = index;
+        cbuf_resource_cache[buffer.GetHash()] = index;
+        return index;
+    }
+
+    return search->second;
+}
+
+GLuint CachedShader::GetProgramResourceIndex(const GLShader::GlobalMemoryEntry& global_mem) {
+    const auto search{gmem_resource_cache.find(global_mem.GetHash())};
+    if (search == gmem_resource_cache.end()) {
+        const GLuint index{glGetProgramResourceIndex(program.handle, GL_SHADER_STORAGE_BLOCK,
+                                                     global_mem.GetName().c_str())};
+        gmem_resource_cache[global_mem.GetHash()] = index;
         return index;
     }
 
diff --git a/src/video_core/renderer_opengl/gl_shader_cache.h b/src/video_core/renderer_opengl/gl_shader_cache.h
index e0887dd7b..62b1733b4 100644
--- a/src/video_core/renderer_opengl/gl_shader_cache.h
+++ b/src/video_core/renderer_opengl/gl_shader_cache.h
@@ -76,6 +76,9 @@ public:
     /// Gets the GL program resource location for the specified resource, caching as needed
     GLuint GetProgramResourceIndex(const GLShader::ConstBufferEntry& buffer);
 
+    /// Gets the GL program resource location for the specified resource, caching as needed
+    GLuint GetProgramResourceIndex(const GLShader::GlobalMemoryEntry& global_mem);
+
     /// Gets the GL uniform location for the specified resource, caching as needed
     GLint GetUniformLocation(const GLShader::SamplerEntry& sampler);
 
@@ -107,7 +110,8 @@ private:
         OGLProgram triangles_adjacency;
     } geometry_programs;
 
-    std::map<u32, GLuint> resource_cache;
+    std::map<u32, GLuint> cbuf_resource_cache;
+    std::map<u32, GLuint> gmem_resource_cache;
     std::map<u32, GLint> uniform_cache;
 };