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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert, R. Belmont
//============================================================
//
// winglcontext.h - Windows-specific GL context
//
// SDLMAME by Olivier Galibert and R. Belmont
//
//============================================================
#pragma once
#ifndef __WIN_GL_CONTEXT__
#define __WIN_GL_CONTEXT__
#include "modules/opengl/osd_opengl.h"
class win_gl_context : public osd_gl_context
{
public:
win_gl_context(HWND window) : osd_gl_context(), m_context(0), m_window(NULL), m_hdc(0)
{
m_error[0] = 0;
this->pfn_wglGetProcAddress = (PROC (WINAPI *)(LPCSTR lpszProc)) GetProcAddress(m_module, "wglGetProcAddress");
this->pfn_wglCreateContext = (HGLRC (WINAPI *)(HDC hdc)) GetProcAddress(m_module, "wglCreateContext");
this->pfn_wglDeleteContext = (BOOL (WINAPI *)(HGLRC hglrc)) GetProcAddress(m_module, "wglDeleteContext");
this->pfn_wglMakeCurrent = (BOOL (WINAPI *)(HDC hdc, HGLRC hglrc)) GetProcAddress(m_module, "wglMakeCurrent");
this->pfn_wglGetExtensionsStringEXT = (const char *(WINAPI *) (void)) pfn_wglGetProcAddress("wglGetExtensionsStringEXT");
if (WGLExtensionSupported("WGL_EXT_swap_control"))
{
this->pfn_wglSwapIntervalEXT = (BOOL (WINAPI *) (int)) getProcAddress("wglSwapIntervalEXT");
this->pfn_wglGetSwapIntervalEXT = (int (WINAPI *) (void)) getProcAddress("wglGetSwapIntervalEXT");
}
else
{
pfn_wglSwapIntervalEXT = NULL;
pfn_wglGetSwapIntervalEXT = NULL;
}
m_hdc = GetDC(window);
if (!setupPixelFormat(m_hdc))
{
m_context = this->pfn_wglCreateContext(m_hdc);
if (!m_context)
{
FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, GetLastError(), 0, m_error, 255, NULL);
return;
}
this->pfn_wglMakeCurrent(m_hdc, m_context);
}
}
virtual ~win_gl_context()
{
this->pfn_wglDeleteContext(m_context);
ReleaseDC(m_window, m_hdc);
}
virtual void MakeCurrent() override
{
this->pfn_wglMakeCurrent(m_hdc, m_context);
}
virtual const char *LastErrorMsg() override
{
if (m_error[0] == 0)
return NULL;
else
return m_error;
}
virtual void *getProcAddress(const char *proc) override
{
void *ret = (void *) GetProcAddress(m_module, proc);
if (ret == NULL)
ret = (void *) this->pfn_wglGetProcAddress(proc);
return ret;
}
virtual int SetSwapInterval(const int swap) override
{
if (this->pfn_wglSwapIntervalEXT != NULL)
{
this->pfn_wglSwapIntervalEXT(swap ? 1 : 0);
}
return 0;
}
virtual void SwapBuffer() override
{
SwapBuffers(m_hdc);
//wglSwapLayerBuffers(GetDC(window().m_hwnd), WGL_SWAP_MAIN_PLANE);
}
static void load_library()
{
m_module = LoadLibraryA("opengl32.dll");
}
private:
int setupPixelFormat(HDC hDC)
{
PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR), /* size */
1, /* version */
PFD_SUPPORT_OPENGL |
PFD_DRAW_TO_WINDOW |
PFD_DOUBLEBUFFER, /* support double-buffering */
PFD_TYPE_RGBA, /* color type */
32, /* prefered color depth */
0, 0, 0, 0, 0, 0, /* color bits (ignored) */
0, /* no alpha buffer */
0, /* alpha bits (ignored) */
0, /* no accumulation buffer */
0, 0, 0, 0, /* accum bits (ignored) */
16, /* depth buffer */
0, /* no stencil buffer */
0, /* no auxiliary buffers */
PFD_MAIN_PLANE, /* main layer */
0, /* reserved */
0, 0, 0, /* no layer, visible, damage masks */
};
int pixelFormat;
pixelFormat = ChoosePixelFormat(hDC, &pfd);
if (pixelFormat == 0) {
strcpy(m_error, "ChoosePixelFormat failed");
return 1;
}
if (SetPixelFormat(hDC, pixelFormat, &pfd) != TRUE) {
strcpy(m_error, "SetPixelFormat failed.");
return 1;
}
return 0;
}
bool WGLExtensionSupported(const char *extension_name)
{
//if (pfn_wglGetExtensionsStringEXT != NULL)
// printf("%s\n", this->pfn_wglGetExtensionsStringEXT());
if (pfn_wglGetExtensionsStringEXT != NULL && strstr(pfn_wglGetExtensionsStringEXT(), extension_name) != NULL)
return true;
else
return false;
}
HGLRC m_context;
HWND m_window;
HDC m_hdc;
char m_error[256];
PROC (WINAPI *pfn_wglGetProcAddress)(LPCSTR lpszProc);
HGLRC (WINAPI *pfn_wglCreateContext)(HDC hdc);
BOOL (WINAPI *pfn_wglDeleteContext)(HGLRC hglrc);
BOOL (WINAPI *pfn_wglMakeCurrent)(HDC hdc, HGLRC hglrc);
const char *(WINAPI *pfn_wglGetExtensionsStringEXT) (void);
BOOL (WINAPI *pfn_wglSwapIntervalEXT) (int interval);
int (WINAPI * pfn_wglGetSwapIntervalEXT) (void);
static HMODULE m_module;
};
#endif // __WIN_GL_CONTEXT__
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