2 * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
4 * Permission to use, copy, modify, distribute, and sell this software and
5 * its documentation for any purpose is hereby granted without fee, provided
6 * that (i) the above copyright notices and this permission notice appear in
7 * all copies of the software and related documentation, and (ii) the name of
8 * Silicon Graphics may not be used in any advertising or
9 * publicity relating to the software without the specific, prior written
10 * permission of Silicon Graphics.
12 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
17 * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
18 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
36 # include <OpenGL/glu.h>
37 # include <GLUT/glut.h>
47 static void checkGlError(const char *call) {
48 GLenum error = glGetError();
49 if (error != GL_NO_ERROR) {
50 fprintf(stderr, "error: %s -> %s\n", call, gluErrorString(error));
55 static void Init(void)
57 const GLubyte *extensions;
58 GLboolean has_GL_GREMEDY_string_marker;
59 GLboolean has_GL_GREMEDY_frame_terminator;
61 extensions = glGetString(GL_EXTENSIONS);
62 checkGlError("glGetString(GL_EXTENSIONS)");
63 has_GL_GREMEDY_string_marker = gluCheckExtension("GL_GREMEDY_string_marker", extensions);
64 has_GL_GREMEDY_frame_terminator = gluCheckExtension("GL_GREMEDY_string_marker", extensions);
66 if (GLEW_VERSION_3_0) {
67 GLint has_GL3_GREMEDY_string_marker = 0;
68 GLint has_GL3_GREMEDY_frame_terminator = 0;
71 GLint num_extensions = 0;
72 glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
73 checkGlError("glGetIntegerv(GL_NUM_EXTENSIONS)");
75 for (i = 0; i < num_extensions; ++i) {
76 const char *extension;
78 extension = (const char *)glGetStringi(GL_EXTENSIONS, i);
79 checkGlError("glGetStringi(GL_EXTENSIONS, i)");
81 if (strlen(extension) == 0) {
82 fprintf(stderr, "error: glGetStringi returned empty string\n");
86 if (strcmp(extension, "GL_GREMEDY_string_marker_count") == 0) {
87 ++has_GL3_GREMEDY_string_marker;
90 if (strcmp(extension, "GL_GREMEDY_frame_terminator") == 0) {
91 ++has_GL3_GREMEDY_frame_terminator;
95 if (!!has_GL_GREMEDY_string_marker != !!has_GL3_GREMEDY_string_marker) {
96 fprintf(stderr, "error: GL_GREMEDY_string_marker not consistently supported by GL3\n");
100 if (!!has_GL_GREMEDY_frame_terminator != !!has_GL3_GREMEDY_frame_terminator) {
101 fprintf(stderr, "error: GL_GREMEDY_frame_terminator not consistently supported by GL3\n");
108 if (!!has_GL_GREMEDY_string_marker != !!GLEW_GREMEDY_string_marker) {
109 fprintf(stderr, "error: GL_GREMEDY_string_marker not consistently supported by GLEW\n");
113 if (!!has_GL_GREMEDY_frame_terminator != !!GLEW_GREMEDY_frame_terminator) {
114 fprintf(stderr, "error: GL_GREMEDY_frame_terminator not consistently supported by GLEW\n");
118 if (GLEW_GREMEDY_string_marker) {
119 glStringMarkerGREMEDY(strlen("Init"), "Init - this should not be included");
122 glClearColor(0.3, 0.1, 0.3, 1.0);
125 static void Reshape(int width, int height)
127 if (GLEW_GREMEDY_string_marker) {
128 glStringMarkerGREMEDY(0, __FUNCTION__);
131 glViewport(0, 0, (GLint)width, (GLint)height);
133 glMatrixMode(GL_PROJECTION);
135 glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
136 glMatrixMode(GL_MODELVIEW);
139 static void Draw(void)
141 if (GLEW_GREMEDY_string_marker) {
142 glStringMarkerGREMEDY(0, __FUNCTION__);
145 glClear(GL_COLOR_BUFFER_BIT);
147 glBegin(GL_TRIANGLES);
149 glVertex3f(-0.9, -0.9, -30.0);
151 glVertex3f( 0.9, -0.9, -30.0);
153 glVertex3f( 0.0, 0.9, -30.0);
158 if (GLEW_GREMEDY_frame_terminator) {
159 glFrameTerminatorGREMEDY();
162 glutDestroyWindow(win);
167 int main(int argc, char **argv)
169 glutInit(&argc, argv);
171 glutInitWindowPosition(0, 0);
172 glutInitWindowSize(250, 250);
174 glutInitDisplayMode(GLUT_RGB | GLUT_ALPHA | GLUT_SINGLE);
176 win = glutCreateWindow(*argv);
183 glutReshapeFunc(Reshape);
184 glutDisplayFunc(Draw);