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comparison: gfx/gl/ScopedGLHelpers.h

gfx/gl/ScopedGLHelpers.h

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1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 #ifndef SCOPEDGLHELPERS_H_
7 #define SCOPEDGLHELPERS_H_
8
9 #include "GLContext.h"
10
11 namespace mozilla {
12 namespace gl {
13
14 //RAII via CRTP!
15 template <class Derived>
16 struct ScopedGLWrapper
17 {
18 private:
19 bool mIsUnwrapped;
20
21 protected:
22 GLContext* const mGL;
23
24 ScopedGLWrapper(GLContext* gl)
25 : mIsUnwrapped(false)
26 , mGL(gl)
27 {
28 MOZ_ASSERT(&ScopedGLWrapper<Derived>::Unwrap == &Derived::Unwrap);
29 MOZ_ASSERT(&Derived::UnwrapImpl);
30 MOZ_ASSERT(mGL->IsCurrent());
31 }
32
33 virtual ~ScopedGLWrapper() {
34 if (!mIsUnwrapped)
35 Unwrap();
36 }
37
38 public:
39 void Unwrap() {
40 MOZ_ASSERT(!mIsUnwrapped);
41
42 Derived* derived = static_cast<Derived*>(this);
43 derived->UnwrapImpl();
44
45 mIsUnwrapped = true;
46 }
47 };
48
49 // Wraps glEnable/Disable.
50 struct ScopedGLState
51 : public ScopedGLWrapper<ScopedGLState>
52 {
53 friend struct ScopedGLWrapper<ScopedGLState>;
54
55 protected:
56 const GLenum mCapability;
57 bool mOldState;
58
59 public:
60 // Use |newState = true| to enable, |false| to disable.
61 ScopedGLState(GLContext* aGL, GLenum aCapability, bool aNewState);
62 // variant that doesn't change state; simply records existing state to be
63 // restored by the destructor
64 ScopedGLState(GLContext* aGL, GLenum aCapability);
65
66 protected:
67 void UnwrapImpl();
68 };
69
70 // Saves and restores with GetUserBoundFB and BindUserFB.
71 struct ScopedBindFramebuffer
72 : public ScopedGLWrapper<ScopedBindFramebuffer>
73 {
74 friend struct ScopedGLWrapper<ScopedBindFramebuffer>;
75
76 protected:
77 GLuint mOldFB;
78
79 private:
80 void Init();
81
82 public:
83 explicit ScopedBindFramebuffer(GLContext* aGL);
84 ScopedBindFramebuffer(GLContext* aGL, GLuint aNewFB);
85
86 protected:
87 void UnwrapImpl();
88 };
89
90 struct ScopedBindTextureUnit
91 : public ScopedGLWrapper<ScopedBindTextureUnit>
92 {
93 friend struct ScopedGLWrapper<ScopedBindTextureUnit>;
94
95 protected:
96 GLenum mOldTexUnit;
97
98 public:
99 ScopedBindTextureUnit(GLContext* aGL, GLenum aTexUnit);
100
101 protected:
102 void UnwrapImpl();
103 };
104
105
106 struct ScopedTexture
107 : public ScopedGLWrapper<ScopedTexture>
108 {
109 friend struct ScopedGLWrapper<ScopedTexture>;
110
111 protected:
112 GLuint mTexture;
113
114 public:
115 ScopedTexture(GLContext* aGL);
116 GLuint Texture() { return mTexture; }
117
118 protected:
119 void UnwrapImpl();
120 };
121
122
123 struct ScopedBindTexture
124 : public ScopedGLWrapper<ScopedBindTexture>
125 {
126 friend struct ScopedGLWrapper<ScopedBindTexture>;
127
128 protected:
129 GLuint mOldTex;
130 GLenum mTarget;
131
132 private:
133 void Init(GLenum aTarget);
134
135 public:
136 ScopedBindTexture(GLContext* aGL, GLuint aNewTex,
137 GLenum aTarget = LOCAL_GL_TEXTURE_2D);
138
139 protected:
140 void UnwrapImpl();
141 };
142
143
144 struct ScopedBindRenderbuffer
145 : public ScopedGLWrapper<ScopedBindRenderbuffer>
146 {
147 friend struct ScopedGLWrapper<ScopedBindRenderbuffer>;
148
149 protected:
150 GLuint mOldRB;
151
152 private:
153 void Init();
154
155 public:
156 explicit ScopedBindRenderbuffer(GLContext* aGL);
157
158 ScopedBindRenderbuffer(GLContext* aGL, GLuint aNewRB);
159
160 protected:
161 void UnwrapImpl();
162 };
163
164
165 struct ScopedFramebufferForTexture
166 : public ScopedGLWrapper<ScopedFramebufferForTexture>
167 {
168 friend struct ScopedGLWrapper<ScopedFramebufferForTexture>;
169
170 protected:
171 bool mComplete; // True if the framebuffer we create is complete.
172 GLuint mFB;
173
174 public:
175 ScopedFramebufferForTexture(GLContext* aGL, GLuint aTexture,
176 GLenum aTarget = LOCAL_GL_TEXTURE_2D);
177
178 bool IsComplete() const {
179 return mComplete;
180 }
181
182 GLuint FB() const {
183 MOZ_ASSERT(IsComplete());
184 return mFB;
185 }
186
187 protected:
188 void UnwrapImpl();
189 };
190
191 struct ScopedFramebufferForRenderbuffer
192 : public ScopedGLWrapper<ScopedFramebufferForRenderbuffer>
193 {
194 friend struct ScopedGLWrapper<ScopedFramebufferForRenderbuffer>;
195
196 protected:
197 bool mComplete; // True if the framebuffer we create is complete.
198 GLuint mFB;
199
200 public:
201 ScopedFramebufferForRenderbuffer(GLContext* aGL, GLuint aRB);
202
203 bool IsComplete() const {
204 return mComplete;
205 }
206
207 GLuint FB() const {
208 return mFB;
209 }
210
211 protected:
212 void UnwrapImpl();
213 };
214
215 struct ScopedViewportRect
216 : public ScopedGLWrapper<ScopedViewportRect>
217 {
218 friend struct ScopedGLWrapper<ScopedViewportRect>;
219
220 protected:
221 GLint mSavedViewportRect[4];
222
223 public:
224 ScopedViewportRect(GLContext* aGL, GLint x, GLint y, GLsizei width, GLsizei height);
225
226 protected:
227 void UnwrapImpl();
228 };
229
230 struct ScopedScissorRect
231 : public ScopedGLWrapper<ScopedScissorRect>
232 {
233 friend struct ScopedGLWrapper<ScopedScissorRect>;
234
235 protected:
236 GLint mSavedScissorRect[4];
237
238 public:
239 ScopedScissorRect(GLContext* aGL, GLint x, GLint y, GLsizei width, GLsizei height);
240 explicit ScopedScissorRect(GLContext* aGL);
241
242 protected:
243 void UnwrapImpl();
244 };
245
246 } /* namespace gl */
247 } /* namespace mozilla */
248
249 #endif /* SCOPEDGLHELPERS_H_ */

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