ミニゲームを作るために、GDIを使ってグラフィックスの基本的なフレームワークを作ろうとしています。しかし、GDIは何もレンダリングしていません。クライアント領域が黒くなり、何が間違っているのかわかりません。
次のコードは、常に実行されているゲームループ内にあります。
//render double buffered with GDI
HDC frontBuffer = GetDC(m_hMainWnd);
HDC backBuffer;
HBITMAP bitmap;
HBITMAP oldBitmap;
backBuffer = CreateCompatibleDC(frontBuffer);
bitmap = CreateCompatibleBitmap(frontBuffer, m_ClientWidth, m_ClientHeight);
oldBitmap = (HBITMAP)SelectObject(backBuffer, bitmap);
GDI->StartDrawing(backBuffer, m_ClientWidth, m_ClientHeight); //this basically selects pens and brushes etc
Render(dRenderTime); //here I render some stuff
GDI->StopDrawing(backBuffer); //selects old pens and brushes back
//blit backbuffer to frontbuffer
BitBlt(frontBuffer, 0, 0, m_ClientWidth, m_ClientHeight, backBuffer, 0, 0, SRCCOPY);
SelectObject(backBuffer, oldBitmap);
DeleteObject(bitmap);
DeleteDC(backBuffer);
ReleaseDC(m_hMainWnd, frontBuffer);
}
私はここで何が間違っているのですか?それがいくつかの愚かな間違いであるならば申し訳ありませんが、私はウィンドウズプログラミングがまったく得意ではありません。
編集:要求に応じて追加のコード:
gdi.h
#pragma once
#include <Windows.h>
#include "Macros.h"
#include "Transform.h"
#include "Text.h"
#define GDI gdi::getInstance()
class gdi
{
private:
HPEN m_OldPen;
HPEN m_Pen;
HBRUSH m_OldBrush;
HBRUSH m_Brush;
HDC m_hdc;
int m_DcWidth;
int m_DcHeight;
COLORREF m_Color;
int m_LineWidth;
DBlib::float3x3 m_Transform;
gdi();
void Transform(int& x_out, int& y_out, const DBlib::float2& p) const;
void Transform_NDC_To_WC(int& x_out, int& y_out, const DBlib::float2& p) const;
void Transfrom_WC_To_NDC(DBlib::float2& p_out, int x, int y) const;
public:
~gdi();
static gdi* getInstance();
void StartDrawing(HDC hdc, int dcwidth, int dcheight);
void StopDrawing(HDC hdc);
void SetColor(const DBlib::float3& col);
void SetLineWidth(int width);
void SetTransform(const DBlib::float3x3& transform);
void DrawText(const DBlib::float2& p1, const std::tstring& s);
void DrawLine(const DBlib::float2& p1, const DBlib::float2& p2);
void DrawPolygon(const DBlib::float2* p, int size);
void FillPolygon(const DBlib::float2* p, int size);
};
GDI.cpp
#include "gdi.h"
gdi* gdi::getInstance()
{
static gdi instance;
return &instance;
}
gdi::gdi()
{
m_hdc = NULL;
m_OldPen = NULL;
m_OldBrush = NULL;
m_LineWidth = 1;
m_Color = RGB(0,0,0);
m_DcWidth = -1;
m_DcHeight = -1;
m_Transform.set_identity();
m_Pen = CreatePen(PS_SOLID,1,RGB(0,0,0));
m_Brush = CreateSolidBrush(RGB(255,255,255));
}
gdi::~gdi()
{
if(m_Pen) DeleteObject(m_Pen);
if(m_Brush) DeleteObject(m_Brush);
}
void gdi::StartDrawing(HDC hdc, int dcwidth, int dcheight)
{
m_hdc = hdc;
m_DcWidth = dcwidth;
m_DcHeight = dcheight;
m_OldPen = (HPEN)SelectObject(hdc, m_Pen);
m_OldBrush = (HBRUSH)SelectObject(hdc, m_Brush);
}
void gdi::StopDrawing(HDC hdc)
{
SelectObject(hdc, m_OldPen);
SelectObject(hdc, m_OldBrush);
m_hdc = NULL;
m_DcWidth = -1;
m_DcHeight = -1;
m_OldPen = NULL;
m_OldBrush = NULL;
}
void gdi::SetColor(const DBlib::float3& col)
{
int r = static_cast<int>(DBlib::clamp(col.x*255.0f, 0.0f, 255.0f));
int g = static_cast<int>(DBlib::clamp(col.y*255.0f, 0.0f, 255.0f));
int b = static_cast<int>(DBlib::clamp(col.z*255.0f, 0.0f, 255.0f));
m_Color = RGB(r,g,b);
SetTextColor(m_hdc, m_Color);
if(m_Pen) DeleteObject(m_Pen);
if(m_Brush) DeleteObject(m_Brush);
m_Pen= CreatePen(PS_SOLID, m_LineWidth, m_Color);
m_Brush= CreateSolidBrush(m_Color);
}
void gdi::SetLineWidth(int width)
{
m_LineWidth = width;
if(m_Pen) DeleteObject(m_Pen);
m_Pen= CreatePen(PS_SOLID, m_LineWidth, m_Color);
}
void gdi::SetTransform(const DBlib::float3x3& transform)
{
m_Transform = transform;
}
void gdi::Transform_NDC_To_WC(int& x_out, int& y_out, const DBlib::float2& p) const
{
x_out = static_cast<int>((p.x+1.0f)*(static_cast<float>(m_DcWidth)/2.0f));
y_out = m_DcHeight - static_cast<int>((p.y+1.0f)*(static_cast<float>(m_DcHeight)/2.0f));
}
void gdi::Transfrom_WC_To_NDC(DBlib::float2& p_out, int x, int y) const
{
p_out.x = static_cast<float>(x)*2.0f/static_cast<float>(m_DcWidth) - 1.0f;
p_out.y = -(static_cast<float>(y)*2.0f/static_cast<float>(m_DcHeight) - 1.0f);
}
void gdi::Transform(int& x_out, int& y_out, const DBlib::float2& p) const
{
Transform_NDC_To_WC(x_out, y_out, p*m_Transform);
}
void gdi::DrawText(const DBlib::float2& pos, const std::tstring& s)
{
int x,y;
Transform(x,y,pos);
TextOut(m_hdc, x, y, s.c_str(), (int)s.size());
}
void gdi::DrawLine(const DBlib::float2& p1, const DBlib::float2& p2)
{
int x1,y1,x2,y2;
Transform(x1,y1,p1);
Transform(x2,y2,p2);
MoveToEx(m_hdc, x1, y1, NULL);
LineTo(m_hdc, x2, y2);
}
void gdi::DrawPolygon(const DBlib::float2* p, int size)
{
int* x = new int[size];
int* y = new int[size];
for(int i=0; i<size; ++i) {
Transform(x[i],y[i],*(p+i));
}
for(int i=0; i<size; ++i) {
MoveToEx(m_hdc, x[i], y[i], NULL);
LineTo(m_hdc, x[(i+1)%size], y[(i+1)%size]);
}
delete[] x;
delete[] y;
}
void gdi::FillPolygon(const DBlib::float2* p, int size)
{
int* x = new int[size];
int* y = new int[size];
POINT* pts = new POINT[size];
for(int i=0; i<size; ++i) {
Transform(x[i],y[i],*(p+i));
pts[i].x = static_cast<LONG>(x[i]);
pts[i].y = static_cast<LONG>(y[i]);
}
Polygon(m_hdc, pts, size);
delete[] x;
delete[] y;
delete[] pts;
}
App.cpp-レンダリングメソッドの定義
void App::Render(float dTime)
{
GDI->SetColor(DBlib::float3(1.0f,1.0f,1.0f));
GDI->SetLineWidth(50);
GDI->DrawLine(DBlib::float2(-1.0f,-1.0f), DBlib::float2(1.0f,1.0f));
}