/**
 ******************************************************************************
 * Xenia : Xbox 360 Emulator Research Project                                 *
 ******************************************************************************
 * Copyright 2015 Ben Vanik. All rights reserved.                             *
 * Released under the BSD license - see LICENSE in the root for more details. *
 ******************************************************************************
 */

#ifndef XENIA_GPU_GL4_GL4_PROFILER_DISPLAY_H_
#define XENIA_GPU_GL4_GL4_PROFILER_DISPLAY_H_

#include <xenia/common.h>
#include <xenia/gpu/gl4/circular_buffer.h>
#include <xenia/gpu/gl4/gl_context.h>
#include <xenia/gpu/gl4/wgl_control.h>
#include <xenia/profiling.h>

namespace xe {
namespace gpu {
namespace gl4 {

class GL4ProfilerDisplay : public ProfilerDisplay {
 public:
  GL4ProfilerDisplay(WGLControl* control);
  virtual ~GL4ProfilerDisplay();

  uint32_t width() const override;
  uint32_t height() const override;

  // TODO(benvanik): GPU timestamping.

  void Begin() override;
  void End() override;
  void DrawBox(int x0, int y0, int x1, int y1, uint32_t color,
               BoxType type) override;
  void DrawLine2D(uint32_t count, float* vertices, uint32_t color) override;
  void DrawText(int x, int y, uint32_t color, const char* text,
                size_t text_length) override;

 private:
  struct Vertex {
    float x;
    float y;
    uint32_t color;
    float u;
    float v;
  };

  bool SetupFont();
  bool SetupState();
  bool SetupShaders();

  Vertex* BeginVertices(size_t count);
  void EndVertices(GLenum prim_type);
  void Flush();

  WGLControl* control_;
  GLuint program_;
  GLuint vao_;
  GLuint font_texture_;
  GLuint64 font_handle_;
  CircularBuffer vertex_buffer_;

  static const size_t kMaxCommands = 32;
  struct {
    GLenum prim_type;
    size_t vertex_offset;
    size_t vertex_count;
  } draw_commands_[kMaxCommands];
  uint32_t draw_command_count_;

  CircularBuffer::Allocation current_allocation_;

  struct {
    uint16_t char_offsets[256];
  } font_description_;
};

}  // namespace gl4
}  // namespace gpu
}  // namespace xe

#endif  // XENIA_GPU_GL4_GL4_PROFILER_DISPLAY_H_