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// 31 march 2019
#include "uipriv_windows.hpp"
#include "area.hpp"
#include <GL/gl.h>
#include <GL/glext.h>
#include <GL/wglext.h>
struct uiGLContext
{
uiArea* a;
HWND hwnd;
HDC dc;
HGLRC rc;
unsigned int version;
};
uiGLContext* createGLContext(uiArea* a, int vermajor, int verminor)
{
uiGLContext* ctx;
BOOL res;
ctx = uiNew(uiGLContext);
ctx->a = a;
ctx->hwnd = a->hwnd;
PIXELFORMATDESCRIPTOR pfd;
memset(&pfd, 0, sizeof(pfd));
pfd.nSize = sizeof(pfd);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cAlphaBits = 8;
pfd.cDepthBits = 24;
pfd.cStencilBits = 8;
pfd.iLayerType = PFD_MAIN_PLANE;
ctx->dc = GetDC(ctx->hwnd);
if (!ctx->dc)
{
uiFree(ctx);
return NULL;
}
int pixelformat = ChoosePixelFormat(ctx->dc, &pfd);
res = SetPixelFormat(ctx->dc, pixelformat, &pfd);
if (!res)
{
ReleaseDC(ctx->hwnd, ctx->dc);
uiFree(ctx);
return NULL;
}
ctx->rc = wglCreateContext(ctx->dc);
if (!ctx->rc)
{
ReleaseDC(ctx->hwnd, ctx->dc);
uiFree(ctx);
return NULL;
}
wglMakeCurrent(ctx->dc, ctx->rc);
if (vermajor >= 3)
{
HGLRC (*wglCreateContextAttribsARB)(HDC,HGLRC,const int*);
HGLRC rc_better = NULL;
wglCreateContextAttribsARB = (HGLRC(*)(HDC,HGLRC,const int*))wglGetProcAddress("wglCreateContextAttribsARB");
if (wglCreateContextAttribsARB)
{
int attribs[15];
int i = 0;
attribs[i++] = WGL_CONTEXT_MAJOR_VERSION_ARB;
attribs[i++] = vermajor;
attribs[i++] = WGL_CONTEXT_MINOR_VERSION_ARB;
attribs[i++] = verminor;
attribs[i] = 0;
rc_better = wglCreateContextAttribsARB(ctx->dc, NULL, attribs);
}
wglMakeCurrent(NULL, NULL);
wglDeleteContext(ctx->rc);
if (!rc_better)
{
ReleaseDC(ctx->hwnd, ctx->dc);
uiFree(ctx);
return NULL;
}
ctx->version = uiGLVersion(vermajor, verminor);
ctx->rc = rc_better;
wglMakeCurrent(ctx->dc, ctx->rc);
}
return ctx;
}
void freeGLContext(uiGLContext* ctx)
{
if (ctx == NULL) return;
wglMakeCurrent(NULL, NULL);
wglDeleteContext(ctx->rc);
ReleaseDC(ctx->hwnd, ctx->dc);
uiFree(ctx);
}
void uiGLMakeContextCurrent(uiGLContext* ctx)
{
if (ctx == NULL)
{
wglMakeCurrent(NULL, NULL);
return;
}
if (wglGetCurrentContext() == ctx->rc) return;
int res = wglMakeCurrent(ctx->dc, ctx->rc);
}
unsigned int uiGLGetVersion(uiGLContext* ctx)
{
if (ctx == NULL) return 0;
return ctx->version;
}
void *uiGLGetProcAddress(const char* proc)
{
return (void*)wglGetProcAddress(proc);
}
void uiGLBegin(uiGLContext* ctx)
{
}
void uiGLEnd(uiGLContext* ctx)
{
}
void uiGLSwapBuffers(uiGLContext* ctx)
{
if (ctx == NULL) return;
SwapBuffers(ctx->dc);
}
int uiGLGetFramebuffer(uiGLContext* ctx)
{
return 0;
}
float uiGLGetFramebufferScale(uiGLContext* ctx)
{
// TODO
return 1;
}
void uiGLSetVSync(int sync)
{
static PFNWGLSWAPINTERVALEXTPROC _wglSwapIntervalEXT = NULL;
static bool symloaded = false;
if (!symloaded)
{
PFNGLGETSTRINGIPROC _glGetStringi = (PFNGLGETSTRINGIPROC)wglGetProcAddress("glGetStringi");
if (_glGetStringi == NULL) return;
GLint numext;
glGetIntegerv(GL_NUM_EXTENSIONS, &numext);
bool hasswapctrl = false;
for (GLint i = 0; i < numext; i++)
{
const char* ext = (const char*)_glGetStringi(GL_EXTENSIONS, i);
if (!stricmp(ext, "WGL_EXT_swap_control"))
{
hasswapctrl = true;
break;
}
}
if (hasswapctrl)
_wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
symloaded = true;
}
if (_wglSwapIntervalEXT)
_wglSwapIntervalEXT(sync);
}
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