Repo created

dev_sandbox/imgui_renderer.hpp

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+#pragma once
+
+#include "drape/glsl_types.hpp"
+#include "drape/graphics_context.hpp"
+#include "drape/mesh_object.hpp"
+#include "drape/pointers.hpp"
+#include "drape/render_state.hpp"
+#include "drape/static_texture.hpp"
+#include "drape/texture_manager.hpp"
+
+#include <array>
+#include <cstdint>
+#include <functional>
+#include <mutex>
+#include <vector>
+
+class ImguiRenderer
+{
+public:
+  ImguiRenderer();
+  void Render(ref_ptr<dp::GraphicsContext> context, ref_ptr<dp::TextureManager> textureManager,
+              ref_ptr<gpu::ProgramManager> programManager);
+  void Update(std::function<void()> const & uiCallback);
+  void Reset();
+
+private:
+  void UpdateTexture();
+  void UpdateBuffers();
+
+  struct ImguiVertex
+  {
+    glsl::vec2 position;
+    glsl::vec2 texCoords;
+    glsl::vec4 color;
+  };
+  static_assert(sizeof(ImguiVertex) == 2 * sizeof(glsl::vec4));
+
+  struct DrawCall
+  {
+    uint32_t indexCount = 0;
+    uint32_t startIndex = 0;
+    glsl::uvec4 clipRect{};
+  };
+
+  drape_ptr<dp::MeshObject> m_mesh;
+  uint32_t m_vertexCount = 2000;
+  uint32_t m_indexCount = 3000;
+
+  drape_ptr<dp::StaticTexture> m_texture;
+  std::vector<unsigned char> m_textureData;
+  uint32_t m_textureWidth = 0;
+  uint32_t m_textureHeight = 0;
+
+  dp::RenderState m_state;
+
+  struct UiDataBuffer
+  {
+    std::vector<ImguiVertex> m_vertices;
+    std::vector<uint16_t> m_indices;
+    std::vector<DrawCall> m_drawCalls;
+    uint32_t m_width;
+    uint32_t m_height;
+  };
+  std::array<UiDataBuffer, 2> m_uiDataBuffer;
+  size_t m_updateIndex = 0;
+
+  glsl::mat4 m_projection;
+
+  std::mutex m_bufferMutex;
+  std::mutex m_textureMutex;
+};