Oolite 1.91.0.7645-241119-222d325
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OOOpenGL.h
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1/*
2
3OOOpenGL.h
4
5Do whatever is appropriate to get gl.h, glu.h and glext.h included.
6
7Also declares OpenGL-related utility functions.
8
9
10Oolite
11Copyright (C) 2004-2013 Giles C Williams and contributors
12
13This program is free software; you can redistribute it and/or
14modify it under the terms of the GNU General Public License
15as published by the Free Software Foundation; either version 2
16of the License, or (at your option) any later version.
17
18This program is distributed in the hope that it will be useful,
19but WITHOUT ANY WARRANTY; without even the implied warranty of
20MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21GNU General Public License for more details.
22
23You should have received a copy of the GNU General Public License
24along with this program; if not, write to the Free Software
25Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
26MA 02110-1301, USA.
27
28*/
29
30#import "OOCocoa.h"
31#import "OOOpenGLOnly.h"
32
33
34typedef enum
35{
36 // NOTE: numerical values are available to scripts.
40 SHADERS_FULL = 3
42
43
44#define NULL_SHADER ((GLhandleARB)0)
45
46
47// Whether to use state verifier. Will be changed to equal OO_CHECK_GL_HEAVY in future.
48#ifdef NDEBUG
49#define OO_GL_STATE_VERIFICATION 0
50#else
51#define OO_GL_STATE_VERIFICATION 1
52#endif
53
54/*
55 OOSetOpenGLState(stateType)
56
57 Set OpenGL state to one of two standard states.
58
59 In Deployment builds, this only modifies the state that differs between
60 the two standard states, and only when the last set state is not the same
61 as the specified target.
62
63 In Debug builds, it tests many different OpenGL state variables, complains
64 if they aren't in the expected state, and corrects them.
65
66
67 The correct procedure for using these functions is:
68 1. Call OOSetOpenGLState(<most appropriate state>)
69 2. Make any state changes needed
70 3. Draw
71 4. Reverse state changes from stage 2
72 5. Call OOVerifyOpenGLState()
73 6. Call OOCheckOpenGLErrors().
74
75
76 The states are:
77 OPENGL_STATE_OPAQUE - standard state for drawing solid objects like OOMesh
78 and planets. This can be considered the Oolite baseline state.
79 Differs from standard GL state as follows:
80 GL_LIGHTING is on
81 GL_LIGHT1 is on
82 GL_TEXTURE_2D is on
83 Blend mode is GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA (but GL_BLEND is off)
84 GL_FOG may be either on or off (as it's set in Universe's draw loop)
85 GL_VERTEX_ARRAY is on
86 GL_NORMAL_ARRAY is on
87 GL_DEPTH_TEST is on
88 GL_CULL_FACE is on
89
90 OPENGL_STATE_TRANSLUCENT_PASS is used during the translucent phase of the
91 universe draw loop. This usage needs to be cleaned up.
92 Differs from OPENGL_STATE_OPAQUE as follows:
93 GL_LIGHTING is off
94 GL_TEXTURE_2D is off
95 GL_VERTEX_ARRAY is off
96 GL_NORMAL_ARRAY is off
97 GL_DEPTH_WRITEMASK is off
98
99 OPENGL_STATE_ADDITIVE_BLENDING is used for glowy special effects.
100 Differs from OPENGL_STATE_OPAQUE as follows:
101 GL_LIGHTING is off
102 GL_TEXTURE_2D is off
103 GL_BLEND is on
104 Blend mode is GL_SRC_ALPHA, GL_ONE
105 GL_NORMAL_ARRAY is off
106 GL_DEPTH_WRITEMASK is off
107 GL_CULL_FACE is off
108
109 OPENGL_STATE_OVERLAY is used for UI elements, which are unlit and don't use
110 z-buffering.
111 Differs from OPENGL_STATE_OPAQUE as follows:
112 GL_LIGHTING is off
113 GL_TEXTURE_2D is off
114 GL_BLEND is on
115 GL_FOG is off
116 GL_NORMAL_ARRAY is off
117 GL_DEPTH_TEST is off
118 GL_DEPTH_WRITEMASK is off
119 GL_CULL_FACE is off
120*/
130
131
132#if OO_GL_STATE_VERIFICATION
133void OOSetOpenGLState_(OOOpenGLStateID state, const char *function, unsigned line);
134void OOVerifyOpenGLState_(const char *function, unsigned line);
135#define OOSetOpenGLState(STATE) OOSetOpenGLState_(STATE, __FUNCTION__, __LINE__)
136#define OOVerifyOpenGLState() OOVerifyOpenGLState_(__FUNCTION__, __LINE__)
137#else
139#define OOVerifyOpenGLState() do {} while (0)
140#endif
141
142
143// Inform the SetState/VerifyState mechanism that the OpenGL context has been reset to its initial state.
144void OOResetGLStateVerifier(void);
145
146
147/* OOCheckOpenGLErrors()
148 Check for and log OpenGL errors, and returns YES if an error occurred.
149 NOTE: this is controlled by the log message class rendering.opengl.error.
150 If logging is disabled, no error checking will occur. This is done
151 because glGetError() is quite expensive, requiring a full OpenGL
152 state sync.
153*/
154BOOL OOCheckOpenGLErrors(NSString *format, ...);
155
156/* LogOpenGLState()
157 Write a bunch of OpenGL state information to the log.
158*/
159void LogOpenGLState(void);
160
161
162/* GLScaledLineWidth()
163 GLScaledPointSize()
164 GLGetDisplayScaleFactor()
165 GLSetDisplayScaleFactor()
166
167 These functions wrap glLineWidth() and glPointSize(), and multiply the
168 specified size by a "display scale factor". This is currently used to
169 support Retina display modes in Mac OS X 10.7 and later.
170
171 The default display scale factor is 1.0.
172*/
173void GLScaledLineWidth(GLfloat width);
174void GLScaledPointSize(GLfloat size);
175GLfloat GLGetDisplayScaleFactor(void);
176void GLSetDisplayScaleFactor(GLfloat factor);
177
178
179/* OOGLWireframeModeOn()
180 OOGLWireframeModeOff()
181 Enable/disable polygon-to-lines wireframe rendering with line width of 1.
182*/
183void OOGLWireframeModeOn(void);
184void OOGLWireframeModeOff(void);
185
186
187/* GLDrawBallBillboard()
188 Draws a circle corresponding to a sphere of given radius at given distance.
189 Assumes Z buffering will be disabled.
190*/
191void GLDrawBallBillboard(GLfloat radius, GLfloat step, GLfloat z_distance);
192
193/* GLDrawOval(), GLDrawFilledOval()
194 Draw axis-alligned ellipses, as outline and fill respectively.
195*/
196void GLDrawOval(GLfloat x, GLfloat y, GLfloat z, NSSize siz, GLfloat step);
197void GLDrawFilledOval(GLfloat x, GLfloat y, GLfloat z, NSSize siz, GLfloat step);
198
199/* GLDrawPoints(), GLDrawFilledPoints()
200 Draw array of points, as outline and fill respectively.
201*/
202
203typedef struct {
204 GLfloat x;
205 GLfloat y;
206 GLfloat z;
207} OOGLVector;
208
209void GLDrawPoints(OOGLVector *points, int n);
210void GLDrawFilledPoints(OOGLVector *points, int n);
211void GLDrawQuadStrip(OOGLVector *points, int n);
212
213/* OO_CHECK_GL_HEAVY and error-checking stuff
214
215 If OO_CHECK_GL_HEAVY is non-zero, the following error-checking facilities
216 come into play:
217 OOGL(foo) checks for GL errors before and after performing the statement foo.
218 OOGLBEGIN(mode) checks for GL errors, then calls glBegin(mode).
219 OOGLEND() calls glEnd(), then checks for GL errors.
220 CheckOpenGLErrorsHeavy() checks for errors exactly like OOCheckOpenGLErrors().
221
222 If OO_CHECK_GL_HEAVY is zero, these macros don't perform error checking,
223 but otherwise continue to work as before, so:
224 OOGL(foo) performs the statement foo.
225 OOGLBEGIN(mode) calls glBegin(mode);
226 OOGLEND() calls glEnd().
227 CheckOpenGLErrorsHeavy() does nothing (including not performing any parameter side-effects).
228*/
229#ifndef OO_CHECK_GL_HEAVY
230#define OO_CHECK_GL_HEAVY 0
231#endif
232
233
234#if OO_CHECK_GL_HEAVY
235
236#if OO_GL_STATE_VERIFICATION
237void OOGLNoteCurrentFunction(const char *func, unsigned line);
238#else
239#define OOGLNoteCurrentFunction(FUNC, line) do {} while (0)
240#endif
241
242NSString *OOLogAbbreviatedFileName(const char *inName);
243#define OOGL_PERFORM_CHECK(label, code) OOCheckOpenGLErrors(@"%s %@:%u (%s)%s", label, OOLogAbbreviatedFileName(__FILE__), __LINE__, __PRETTY_FUNCTION__, code)
244#define OOGL(statement) do { OOGLNoteCurrentFunction(__FUNCTION__, __LINE__); OOGL_PERFORM_CHECK("PRE", " -- " #statement); statement; OOGL_PERFORM_CHECK("POST", " -- " #statement); } while (0)
245#define CheckOpenGLErrorsHeavy OOCheckOpenGLErrors
246#define OOGLBEGIN(mode) do { OOGLNoteCurrentFunction(__FUNCTION__, __LINE__); OOGL_PERFORM_CHECK("PRE-BEGIN", " -- " #mode); glBegin(mode); } while (0)
247#define OOGLEND() do { glEnd(); OOGLNoteCurrentFunction(__FUNCTION__, __LINE__); OOGL_PERFORM_CHECK("POST-END", ""); } while (0)
248
249#else
250
251#define OOGL(statement) do { statement; } while (0)
252#define CheckOpenGLErrorsHeavy(...) do {} while (0)
253#define OOGLBEGIN glBegin
254#define OOGLEND glEnd
255
256#endif
257
258
259enum
260{
263
264// Programmer-readable shader mode strings.
267// Localized shader mode strings.
269
270
271#ifndef NDEBUG
272
273NSString *OOGLColorToString(GLfloat color[4]);
274NSString *OOGLEnumToString(GLenum value);
275NSString *OOGLFlagToString(bool value);
276
277#endif
NSString * OOLogAbbreviatedFileName(const char *inName)
Definition OOLogging.m:839
static void OOGLNoteCurrentFunction(const char *function, unsigned line)
NSString * OOGLEnumToString(GLenum value)
Definition OOOpenGL.m:492
void OOGLWireframeModeOn(void)
Definition OOOpenGL.m:87
OOShaderSetting
Definition OOOpenGL.h:35
@ SHADERS_FULL
Definition OOOpenGL.h:40
@ SHADERS_SIMPLE
Definition OOOpenGL.h:39
@ SHADERS_OFF
Definition OOOpenGL.h:38
@ SHADERS_NOT_SUPPORTED
Definition OOOpenGL.h:37
void GLDrawFilledOval(GLfloat x, GLfloat y, GLfloat z, NSSize siz, GLfloat step)
Definition OOOpenGL.m:165
void OOGLWireframeModeOff(void)
Definition OOOpenGL.m:103
OOOpenGLStateID
Definition OOOpenGL.h:122
@ OPENGL_STATE_INTERNAL_USE_ONLY
Definition OOOpenGL.h:128
@ OPENGL_STATE_TRANSLUCENT_PASS
Definition OOOpenGL.h:124
@ OPENGL_STATE_ADDITIVE_BLENDING
Definition OOOpenGL.h:125
@ OPENGL_STATE_OVERLAY
Definition OOOpenGL.h:126
@ OPENGL_STATE_OPAQUE
Definition OOOpenGL.h:123
NSString * OOGLColorToString(GLfloat color[4])
Definition OOOpenGL.m:291
void GLDrawPoints(OOGLVector *points, int n)
Definition OOOpenGL.m:174
void OOResetGLStateVerifier(void)
void GLDrawQuadStrip(OOGLVector *points, int n)
Definition OOOpenGL.m:203
OOShaderSetting OOShaderSettingFromString(NSString *string)
BOOL OOCheckOpenGLErrors(NSString *format,...)
Definition OOOpenGL.m:39
@ kOOShaderSettingDefault
Definition OOOpenGL.h:261
void GLScaledLineWidth(GLfloat width)
Definition OOOpenGL.m:218
void GLDrawOval(GLfloat x, GLfloat y, GLfloat z, NSSize siz, GLfloat step)
Definition OOOpenGL.m:155
NSString * OOStringFromShaderSetting(OOShaderSetting setting)
void GLSetDisplayScaleFactor(GLfloat factor)
Definition OOOpenGL.m:238
void GLDrawBallBillboard(GLfloat radius, GLfloat step, GLfloat z_distance)
Definition OOOpenGL.m:111
#define OOSetOpenGLState(STATE)
Definition OOOpenGL.h:135
void LogOpenGLState(void)
Definition OOOpenGL.m:256
void OOVerifyOpenGLState_(const char *function, unsigned line)
void GLScaledPointSize(GLfloat size)
Definition OOOpenGL.m:225
void OOSetOpenGLState_(OOOpenGLStateID state, const char *function, unsigned line)
void GLDrawFilledPoints(OOGLVector *points, int n)
Definition OOOpenGL.m:188
NSString * OOGLFlagToString(bool value)
Definition OOOpenGL.m:563
GLfloat GLGetDisplayScaleFactor(void)
Definition OOOpenGL.m:232
NSString * OODisplayStringFromShaderSetting(OOShaderSetting setting)
float y
float x
voidpf void uLong size
Definition ioapi.h:134
GLfloat y
Definition OOOpenGL.h:205
GLfloat x
Definition OOOpenGL.h:204
GLfloat z
Definition OOOpenGL.h:206