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#include "win32_gl.h"
#include <GL/gl.h>
#include "opengl/4ed_opengl_defines.h"
#define GL_FUNC(N,R,P) typedef R (CALL_CONVENTION N##_Function)P; N##_Function *N = 0;
#include "opengl/4ed_opengl_funcs.h"
#include "opengl/4ed_opengl_render.cpp"
internal b32
win32_wgl_good(Void_Func *f){
return(f != 0 &&
f != (Void_Func*)1 &&
f != (Void_Func*)2 &&
f != (Void_Func*)3 &&
f != (Void_Func*)-1);
}
typedef HGLRC (CALL_CONVENTION wglCreateContextAttribsARB_Function)(HDC,HGLRC,i32*);
typedef BOOL (CALL_CONVENTION wglChoosePixelFormatARB_Function)(HDC,i32*,f32*,u32,i32*,u32*);
typedef char* (CALL_CONVENTION wglGetExtensionsStringEXT_Function)();
typedef VOID (CALL_CONVENTION wglSwapIntervalEXT_Function)(i32);
global wglCreateContextAttribsARB_Function *wglCreateContextAttribsARB = 0;
global wglChoosePixelFormatARB_Function *wglChoosePixelFormatARB = 0;
global wglGetExtensionsStringEXT_Function *wglGetExtensionsStringEXT = 0;
global wglSwapIntervalEXT_Function *wglSwapIntervalEXT = 0;
internal LRESULT CALL_CONVENTION
win32_proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
internal b32
win32_gl_create_window(HWND *wnd_out, HGLRC *context_out, DWORD style, RECT rect){
HINSTANCE this_instance = GetModuleHandle(0);
local_persist b32 srgb_support = false;
local_persist b32 register_success = true;
local_persist b32 first_call = true;
if (first_call){
log_os(" GL bootstrapping...\n");
first_call = false;
// NOTE(allen): Create the GL bootstrap window
log_os(" registering bootstrap class...\n");
WNDCLASSW wglclass = {};
wglclass.lpfnWndProc = DefWindowProcW;
wglclass.hInstance = this_instance;
wglclass.lpszClassName = L"wgl-loader";
if (RegisterClassW(&wglclass) == 0){
register_success = false;
goto fail_register;
}
log_os(" creating bootstrap window...\n");
HWND wglwindow = CreateWindowW(wglclass.lpszClassName, L"", 0, 0, 0, 0, 0,
0, 0, this_instance, 0);
if (wglwindow == 0){
register_success = false;
goto fail_register;
}
// NOTE(allen): Create the GL bootstrap context
log_os(" setting bootstrap pixel format...\n");
HDC wgldc = GetDC(wglwindow);
PIXELFORMATDESCRIPTOR format = {};
format.nSize = sizeof(format);
format.nVersion = 1;
format.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
format.iPixelType = PFD_TYPE_RGBA;
format.cColorBits = 32;
format.cAlphaBits = 8;
format.cDepthBits = 24;
format.iLayerType = PFD_MAIN_PLANE;
i32 suggested_format_index = ChoosePixelFormat(wgldc, &format);
if (!SetPixelFormat(wgldc, suggested_format_index, &format)){
register_success = false;
goto fail_register;
}
log_os(" creating bootstrap GL context...\n");
HGLRC wglcontext = wglCreateContext(wgldc);
if (wglcontext == 0){
register_success = false;
goto fail_register;
}
log_os(" making bootstrap GL context current...\n");
if (!wglMakeCurrent(wgldc, wglcontext)){
register_success = false;
goto fail_register;
}
// NOTE(allen): Load wgl extensions
log_os(" loading wgl extensions...\n");
#define LoadWGL(f,l) Stmnt((f) = (f##_Function*)wglGetProcAddress(#f); \
(l) = (l) && win32_wgl_good((Void_Func*)(f));)
b32 load_success = true;
LoadWGL(wglCreateContextAttribsARB, load_success);
LoadWGL(wglChoosePixelFormatARB, load_success);
LoadWGL(wglGetExtensionsStringEXT, load_success);
if (!load_success){
register_success = false;
goto fail_register;
}
log_os(" checking wgl extensions...\n");
char *extensions_c = wglGetExtensionsStringEXT();
String_Const_u8 extensions = SCu8((u8*)extensions_c);
{
String_Const_u8 s = string_skip_whitespace(extensions);
for (;s.size > 0;){
u64 end = string_find_first_whitespace(s);
String_Const_u8 m = string_prefix(s, end);
if (string_match(m, string_u8_litexpr("WGL_EXT_framebuffer_sRGB")) ||
string_match(m, string_u8_litexpr("WGL_ARB_framebuffer_sRGB"))){
srgb_support = true;
}
else if (string_match(m, string_u8_litexpr("WGL_EXT_swap_interval"))){
b32 wgl_swap_interval_ext = true;
LoadWGL(wglSwapIntervalEXT, wgl_swap_interval_ext);
if (!wgl_swap_interval_ext){
wglSwapIntervalEXT = 0;
}
}
s = string_skip_whitespace(string_skip(s, end));
}
}
// NOTE(allen): Load gl functions
log_os(" loading core GL functions...\n");
#define GL_FUNC(f,R,P) LoadWGL(f,load_success);
#include "opengl/4ed_opengl_funcs.h"
if (!load_success){
register_success = false;
goto fail_register;
}
// NOTE(allen): Cleanup the GL bootstrap resources
log_os(" cleaning up boostrap resources...\n");
ReleaseDC(wglwindow, wgldc);
DestroyWindow(wglwindow);
wglDeleteContext(wglcontext);
// NOTE(allen): Register the graphics window class
log_os(" registering graphics class...\n");
WNDCLASSW wndclass = {};
wndclass.style = CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS;
wndclass.lpfnWndProc = win32_proc;
wndclass.hIcon = LoadIconW(GetModuleHandle(0), L"main");
wndclass.hInstance = this_instance;
wndclass.lpszClassName = L"GRAPHICS-WINDOW-NAME";
if (RegisterClassW(&wndclass) == 0){
register_success = false;
goto fail_register;
}
}
fail_register:;
b32 result = false;
if (register_success){
// NOTE(allen): Create the graphics window
log_os(" creating graphics window...\n");
HWND wnd = CreateWindowExW(0, L"GRAPHICS-WINDOW-NAME", L"GRAPHICS", style,
CW_USEDEFAULT, CW_USEDEFAULT, rect.right - rect.left, rect.bottom - rect.top,
0, 0, this_instance, 0);
*wnd_out = 0;
*context_out = 0;
if (wnd != 0){
log_os(" setting graphics pixel format...\n");
HDC dc = GetDC(wnd);
PIXELFORMATDESCRIPTOR format = {};
i32 pixel_attrib_list[] = {
/* 0*/WGL_DRAW_TO_WINDOW_ARB, TRUE,
/* 2*/WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB,
/* 4*/WGL_SUPPORT_OPENGL_ARB, TRUE,
/* 6*/WGL_DOUBLE_BUFFER_ARB, GL_TRUE,
/* 8*/WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB,
/*10*/WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB, GL_TRUE,
/*12*/0,
};
if (!srgb_support){
pixel_attrib_list[10] = 0;
}
i32 suggested_format_index = 0;
u32 ignore = 0;
if (!wglChoosePixelFormatARB(dc, pixel_attrib_list, 0, 1, &suggested_format_index, &ignore)){
goto fail_window_init;
}
DescribePixelFormat(dc, suggested_format_index, sizeof(format), &format);
if (!SetPixelFormat(dc, suggested_format_index, &format)){
goto fail_window_init;
}
log_os(" setting graphics attributes...\n");
i32 context_attrib_list[] = {
/*0*/WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
/*2*/WGL_CONTEXT_MINOR_VERSION_ARB, 2,
/*4*/WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB
#if GL_DEBUG_MODE
|WGL_CONTEXT_DEBUG_BIT_ARB
#endif
,
/*6*/WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
/*8*/0
};
log_os(" creating graphics GL context...\n");
HGLRC context = wglCreateContextAttribsARB(dc, 0, context_attrib_list);
if (context == 0){
goto fail_window_init;
}
log_os(" making graphics GL context current...\n");
wglMakeCurrent(dc, context);
if (wglSwapIntervalEXT != 0){
log_os(" setting swap interval...\n");
wglSwapIntervalEXT(1);
}
*wnd_out = wnd;
*context_out = context;
result = true;
if (false){
fail_window_init:;
DWORD error = GetLastError();
ReleaseDC(wnd, dc);
DestroyWindow(wnd);
SetLastError(error);
}
}
}
return(result);
}
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