src/graphics/opengl_wrapper_win.cpp - main - SneakBug8/Project-Alice

src/graphics/opengl_wrapper_win.cpp
92 строки3 KB
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07 авг 2025, 15:24
07 авг 2025, 15:24fd408b8
#include "wglew.h"

#include <cassert>

#ifndef UNICODE
#define UNICODE
#endif
#define NOMINMAX
#define WIN32_LEAN_AND_MEAN

#include "Windows.h"

namespace ogl {

void create_opengl_context(sys::state& state) {
	assert(state.win_ptr && state.win_ptr->hwnd && !state.open_gl.context);

	HDC window_dc = state.win_ptr->opengl_window_dc;

	PIXELFORMATDESCRIPTOR pfd;
	ZeroMemory(&pfd, 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 = 32;
	pfd.cDepthBits = 24;
	pfd.cStencilBits = 8;
	pfd.iLayerType = PFD_MAIN_PLANE;
	int const pixel_format = ChoosePixelFormat(window_dc, &pfd);
	SetPixelFormat(window_dc, pixel_format, &pfd);

	auto handle_to_ogl_dc = wglCreateContext(window_dc);
	wglMakeCurrent(window_dc, handle_to_ogl_dc);

	if(glewInit() != 0) {
		window::emit_error_message("GLEW failed to initialize", true);
	}

	if(!wglewIsSupported("WGL_ARB_create_context")) {
		window::emit_error_message("WGL_ARB_create_context not supported", true);
	}

	// Explicitly request for OpenGL 3.1
	static const int attribs_3_1[] = {
		WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
		WGL_CONTEXT_MINOR_VERSION_ARB, 3,
		WGL_CONTEXT_FLAGS_ARB,
#ifndef NDEBUG
		WGL_CONTEXT_DEBUG_BIT_ARB |
#endif
		0,
		WGL_CONTEXT_PROFILE_MASK_ARB,
		WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
		0,
		WGL_SAMPLE_BUFFERS_ARB,
		GL_TRUE,
		0,
		WGL_SAMPLES_ARB,
		8
	};
	state.open_gl.context = wglCreateContextAttribsARB(window_dc, nullptr, attribs_3_1);
	if(state.open_gl.context == nullptr) {
		window::emit_error_message("Unable to create WGL context", true);
	}

	wglMakeCurrent(window_dc, HGLRC(state.open_gl.context));
	wglDeleteContext(handle_to_ogl_dc);

	// wglMakeCurrent(window_dc, HGLRC(state.open_gl.context));
#ifndef NDEBUG
	glDebugMessageCallback(debug_callback, nullptr);
	glDebugMessageControl(GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, nullptr, GL_TRUE);
	glDebugMessageControl(GL_DONT_CARE, GL_DEBUG_TYPE_OTHER, GL_DEBUG_SEVERITY_LOW, 0, nullptr, GL_FALSE);
#endif

	if(wglewIsSupported("WGL_EXT_swap_control_tear") == 1) {
		wglSwapIntervalEXT(-1);
	} else if(wglewIsSupported("WGL_EXT_swap_control") == 1) {
		wglSwapIntervalEXT(1);
	} else {
		MessageBoxW(state.win_ptr->hwnd, L"WGL_EXT_swap_control_tear and WGL_EXT_swap_control not supported", L"OpenGL error", MB_OK);
	}
}

void shutdown_opengl(sys::state& state) {
	assert(state.win_ptr && state.win_ptr->hwnd && state.open_gl.context);
	wglMakeCurrent(state.win_ptr->opengl_window_dc, nullptr);
	wglDeleteContext(HGLRC(state.open_gl.context));
	state.open_gl.context = nullptr;
}
} // namespace ogl