1 files changed, 64 insertions, 0 deletions
diff --git a/src/video_core/renderer_opengl/gl_primitive_assembler.cpp b/src/video_core/renderer_opengl/gl_primitive_assembler.cpp
new file mode 100644
index 000000000..ee1d9601b
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_primitive_assembler.cpp
@@ -0,0 +1,64 @@
+// Copyright 2018 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <array>
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "core/memory.h"
+#include "video_core/renderer_opengl/gl_buffer_cache.h"
+#include "video_core/renderer_opengl/gl_primitive_assembler.h"
+
+namespace OpenGL {
+
+constexpr u32 TRIANGLES_PER_QUAD = 6;
+constexpr std::array<u32, TRIANGLES_PER_QUAD> QUAD_MAP = {0, 1, 2, 0, 2, 3};
+
+PrimitiveAssembler::PrimitiveAssembler(OGLBufferCache& buffer_cache) : buffer_cache(buffer_cache) {}
+
+PrimitiveAssembler::~PrimitiveAssembler() = default;
+
+std::size_t PrimitiveAssembler::CalculateQuadSize(u32 count) const {
+    ASSERT_MSG(count % 4 == 0, "Quad count is expected to be a multiple of 4");
+    return (count / 4) * TRIANGLES_PER_QUAD * sizeof(GLuint);
+}
+
+GLintptr PrimitiveAssembler::MakeQuadArray(u32 first, u32 count) {
+    const std::size_t size{CalculateQuadSize(count)};
+    auto [dst_pointer, index_offset] = buffer_cache.ReserveMemory(size);
+
+    for (u32 primitive = 0; primitive < count / 4; ++primitive) {
+        for (u32 i = 0; i < TRIANGLES_PER_QUAD; ++i) {
+            const u32 index = first + primitive * 4 + QUAD_MAP[i];
+            std::memcpy(dst_pointer, &index, sizeof(index));
+            dst_pointer += sizeof(index);
+        }
+    }
+
+    return index_offset;
+}
+
+GLintptr PrimitiveAssembler::MakeQuadIndexed(Tegra::GPUVAddr gpu_addr, std::size_t index_size,
+                                             u32 count) {
+    const std::size_t map_size{CalculateQuadSize(count)};
+    auto [dst_pointer, index_offset] = buffer_cache.ReserveMemory(map_size);
+
+    auto& memory_manager = Core::System::GetInstance().GPU().MemoryManager();
+    const boost::optional<VAddr> cpu_addr{memory_manager.GpuToCpuAddress(gpu_addr)};
+    const u8* source{Memory::GetPointer(*cpu_addr)};
+
+    for (u32 primitive = 0; primitive < count / 4; ++primitive) {
+        for (std::size_t i = 0; i < TRIANGLES_PER_QUAD; ++i) {
+            const u32 index = primitive * 4 + QUAD_MAP[i];
+            const u8* src_offset = source + (index * index_size);
+
+            std::memcpy(dst_pointer, src_offset, index_size);
+            dst_pointer += index_size;
+        }
+    }
+
+    return index_offset;
+}
+
+} // namespace OpenGL
+\ No newline at end of file