1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
/**************************************************************************/
/*  context_gl_windows.cpp                                                */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

#if defined(OPENGL_ENABLED) || defined(GLES_ENABLED)

// Author: Juan Linietsky <reduzio@gmail.com>, (C) 2008

#include "context_gl_windows.h"

#include <dwmapi.h>

#define WGL_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define WGL_CONTEXT_MINOR_VERSION_ARB 0x2092
#define WGL_CONTEXT_FLAGS_ARB 0x2094
#define WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x00000002
#define WGL_CONTEXT_PROFILE_MASK_ARB 0x9126
#define WGL_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001

#if defined(__GNUC__)
// Workaround GCC warning from -Wcast-function-type.
#define wglGetProcAddress (void *)wglGetProcAddress
#endif

typedef HGLRC(APIENTRY *PFNWGLCREATECONTEXTATTRIBSARBPROC)(HDC, HGLRC, const int *);

void ContextGL_Windows::release_current() {
	wglMakeCurrent(hDC, NULL);
}

void ContextGL_Windows::make_current() {
	wglMakeCurrent(hDC, hRC);
}

bool ContextGL_Windows::is_offscreen_available() const {
	return hRC_offscreen != NULL;
}

void ContextGL_Windows::make_offscreen_current() {
	ERR_FAIL_COND(!wglMakeCurrent(hDC, hRC_offscreen));
}

void ContextGL_Windows::release_offscreen_current() {
	ERR_FAIL_COND(!wglMakeCurrent(hDC, NULL));
}

HDC ContextGL_Windows::get_hdc() {
	return hDC;
}

HGLRC ContextGL_Windows::get_hglrc() {
	return hRC;
}

int ContextGL_Windows::get_window_width() {
	return OS::get_singleton()->get_video_mode().width;
}

int ContextGL_Windows::get_window_height() {
	return OS::get_singleton()->get_video_mode().height;
}

bool ContextGL_Windows::should_vsync_via_compositor() {
	if (OS::get_singleton()->is_window_fullscreen() || !OS::get_singleton()->is_vsync_via_compositor_enabled()) {
		return false;
	}

	// Note: All Windows versions supported by Godot have a compositor.
	// It can be disabled on earlier Windows versions.
	BOOL dwm_enabled;

	if (SUCCEEDED(DwmIsCompositionEnabled(&dwm_enabled))) {
		return dwm_enabled;
	}

	return false;
}

void ContextGL_Windows::swap_buffers() {
	SwapBuffers(hDC);

	if (use_vsync) {
		bool vsync_via_compositor_now = should_vsync_via_compositor();

		if (vsync_via_compositor_now && wglGetSwapIntervalEXT() == 0) {
			DwmFlush();
		}

		if (vsync_via_compositor_now != vsync_via_compositor) {
			// The previous frame had a different operating mode than this
			// frame. Set the 'vsync_via_compositor' member variable and the
			// OpenGL swap interval to their proper values.
			set_use_vsync(true);
		}
	}
}

void ContextGL_Windows::set_use_vsync(bool p_use) {
	vsync_via_compositor = p_use && should_vsync_via_compositor();

	if (wglSwapIntervalEXT) {
		int swap_interval = (p_use && !vsync_via_compositor) ? 1 : 0;
		wglSwapIntervalEXT(swap_interval);
	}

	use_vsync = p_use;
}

bool ContextGL_Windows::is_using_vsync() const {
	return use_vsync;
}

#define _WGL_CONTEXT_DEBUG_BIT_ARB 0x0001

Error ContextGL_Windows::initialize() {
	static PIXELFORMATDESCRIPTOR pfd = {
		sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
		1,
		PFD_DRAW_TO_WINDOW | // Format Must Support Window
				PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
				PFD_DOUBLEBUFFER,
		(BYTE)PFD_TYPE_RGBA,
		(BYTE)(OS::get_singleton()->is_layered_allowed() ? 32 : 24),
		(BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, // Color Bits Ignored
		(BYTE)(OS::get_singleton()->is_layered_allowed() ? 8 : 0), // Alpha Buffer
		(BYTE)0, // Shift Bit Ignored
		(BYTE)0, // No Accumulation Buffer
		(BYTE)0, (BYTE)0, (BYTE)0, (BYTE)0, // Accumulation Bits Ignored
		(BYTE)24, // 24Bit Z-Buffer (Depth Buffer)
		(BYTE)0, // No Stencil Buffer
		(BYTE)0, // No Auxiliary Buffer
		(BYTE)PFD_MAIN_PLANE, // Main Drawing Layer
		(BYTE)0, // Reserved
		0, 0, 0 // Layer Masks Ignored
	};

	hDC = GetDC(hWnd);
	if (!hDC) {
		return ERR_CANT_CREATE; // Return FALSE
	}

	pixel_format = ChoosePixelFormat(hDC, &pfd);
	if (!pixel_format) // Did Windows Find A Matching Pixel Format?
	{
		return ERR_CANT_CREATE; // Return FALSE
	}

	BOOL ret = SetPixelFormat(hDC, pixel_format, &pfd);
	if (!ret) // Are We Able To Set The Pixel Format?
	{
		return ERR_CANT_CREATE; // Return FALSE
	}

	hRC = wglCreateContext(hDC);
	if (!hRC) // Are We Able To Get A Rendering Context?
	{
		return ERR_CANT_CREATE; // Return FALSE
	}

	wglMakeCurrent(hDC, hRC);

	if (opengl_3_context) {
		int attribs[] = {
			WGL_CONTEXT_MAJOR_VERSION_ARB, 3, //we want a 3.3 context
			WGL_CONTEXT_MINOR_VERSION_ARB, 3,
			//and it shall be forward compatible so that we can only use up to date functionality
			WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
			WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB /*| _WGL_CONTEXT_DEBUG_BIT_ARB*/,
			0
		}; //zero indicates the end of the array

		PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = NULL; //pointer to the method
		wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)wglGetProcAddress("wglCreateContextAttribsARB");

		if (wglCreateContextAttribsARB == NULL) //OpenGL 3.0 is not supported
		{
			wglDeleteContext(hRC);
			return ERR_CANT_CREATE;
		}

		HGLRC new_hRC = wglCreateContextAttribsARB(hDC, 0, attribs);
		if (!new_hRC) {
			wglDeleteContext(hRC);
			return ERR_CANT_CREATE; // Return false
		}
		wglMakeCurrent(hDC, NULL);
		wglDeleteContext(hRC);
		hRC = new_hRC;

		if (!wglMakeCurrent(hDC, hRC)) // Try To Activate The Rendering Context
		{
			return ERR_CANT_CREATE; // Return FALSE
		}

		hRC_offscreen = wglCreateContextAttribsARB(hDC, 0, attribs);
	}

	wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)wglGetProcAddress("wglSwapIntervalEXT");
	wglGetSwapIntervalEXT = (PFNWGLGETSWAPINTERVALEXTPROC)wglGetProcAddress("wglGetSwapIntervalEXT");
	//glWrapperInit(wrapper_get_proc_address);

	return OK;
}

ContextGL_Windows::ContextGL_Windows(HWND hwnd, bool p_opengl_3_context) {<--- Member variable 'ContextGL_Windows::pixel_format' is not initialized in the constructor.
	opengl_3_context = p_opengl_3_context;
	hWnd = hwnd;
	hRC_offscreen = NULL;
	use_vsync = false;
	vsync_via_compositor = false;
}

ContextGL_Windows::~ContextGL_Windows() {
}

#endif