#pragma once
// Untextured quads on the UI's Direct3D 7 device (the argument of the UI's
// render methods, vf14).

#include <cstdint>

#include <windows.h>

namespace game {

constexpr int kDeviceDrawPrimitive = 25;  // IDirect3DDevice7 vtable slots
constexpr int kDeviceSetTexture = 35;
constexpr DWORD kTriangleStrip = 5;
constexpr DWORD kFvfScreenColourTexture = 0x1c4;  // XYZRHW | DIFFUSE | SPECULAR | TEX1

struct ScreenVertex {
    float x, y, z, rhw;
    uint32_t diffuse, specular;
    float u, v;
};

// Fills (x0, y0)-(x1, y1) with the ARGB colour `color`.
inline void FillRect(void* device, float x0, float y0, float x1, float y1, uint32_t color) {
    void** vtable = *static_cast<void***>(device);
    using SetTextureFn = HRESULT(__stdcall*)(void*, DWORD, void*);
    using DrawPrimitiveFn = HRESULT(__stdcall*)(void*, DWORD, DWORD, void*, DWORD, DWORD);
    reinterpret_cast<SetTextureFn>(vtable[kDeviceSetTexture])(device, 0, nullptr);
    ScreenVertex quad[4] = {{x0, y0, 0, 1, color, 0, 0, 0},
                            {x1, y0, 0, 1, color, 0, 1, 0},
                            {x0, y1, 0, 1, color, 0, 0, 1},
                            {x1, y1, 0, 1, color, 0, 1, 1}};
    reinterpret_cast<DrawPrimitiveFn>(vtable[kDeviceDrawPrimitive])(device, kTriangleStrip, kFvfScreenColourTexture,
                                                                     quad, 4, 0);
}

} // namespace game