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
|
/*
* GLSL noise demo.
*
* Michal Krol
* 20 February 2006
*
* Based on the original demo by:
* Stefan Gustavson (stegu@itn.liu.se) 2004, 2005
*/
#ifdef WIN32
#include <windows.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <GL/gl.h>
#include <GL/glut.h>
#include <GL/glext.h>
#ifdef WIN32
#define GETPROCADDRESS(F) wglGetProcAddress(F)
#else
#define GETPROCADDRESS(F) glutGetProcAddress(F)
#endif
static GLhandleARB fragShader;
static GLhandleARB vertShader;
static GLhandleARB program;
static GLint uTime;
static GLfloat u_time = 0.0f;
static PFNGLCREATESHADEROBJECTARBPROC glCreateShaderObjectARB = NULL;
static PFNGLSHADERSOURCEARBPROC glShaderSourceARB = NULL;
static PFNGLCOMPILESHADERARBPROC glCompileShaderARB = NULL;
static PFNGLCREATEPROGRAMOBJECTARBPROC glCreateProgramObjectARB = NULL;
static PFNGLATTACHOBJECTARBPROC glAttachObjectARB = NULL;
static PFNGLLINKPROGRAMARBPROC glLinkProgramARB = NULL;
static PFNGLUSEPROGRAMOBJECTARBPROC glUseProgramObjectARB = NULL;
static PFNGLGETUNIFORMLOCATIONARBPROC glGetUniformLocationARB = NULL;
static PFNGLUNIFORM1FARBPROC glUniform1fARB = NULL;
static void Redisplay (void)
{
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUniform1fARB (uTime, u_time);
glPushMatrix ();
glutSolidSphere (2.0, 20, 10);
glPopMatrix ();
glutSwapBuffers();
}
static void Idle (void)
{
u_time += 0.1f;
glutPostRedisplay ();
}
static void Reshape (int width, int height)
{
glViewport (0, 0, width, height);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
glFrustum (-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
glTranslatef (0.0f, 0.0f, -15.0f);
}
static void Key (unsigned char key, int x, int y)
{
(void) x;
(void) y;
switch (key)
{
case 27:
exit(0);
break;
}
glutPostRedisplay ();
}
static void Init (void)
{
static const char *fragShaderText =
"uniform float time;\n"
"void main () {\n"
" gl_FragColor = gl_Color * vec4 ((0.5 + 0.5 * vec3 (noise1 (\n"
" vec4 (4.0 * gl_TexCoord[0].xyz, 0.5 * time)))), 1.0);\n"
"}\n"
;
static const char *vertShaderText =
"void main () {\n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
" gl_TexCoord[0] = gl_Vertex;\n"
" gl_FrontColor = gl_Color;\n"
"}\n"
;
if (!glutExtensionSupported ("GL_ARB_fragment_shader"))
{
printf ("Sorry, this demo requires GL_ARB_fragment_shader\n");
exit(1);
}
if (!glutExtensionSupported ("GL_ARB_shader_objects"))
{
printf ("Sorry, this demo requires GL_ARB_shader_objects\n");
exit(1);
}
if (!glutExtensionSupported ("GL_ARB_shading_language_100"))
{
printf ("Sorry, this demo requires GL_ARB_shading_language_100\n");
exit(1);
}
if (!glutExtensionSupported ("GL_ARB_vertex_shader"))
{
printf ("Sorry, this demo requires GL_ARB_vertex_shader\n");
exit(1);
}
glCreateShaderObjectARB = (PFNGLCREATESHADEROBJECTARBPROC)
GETPROCADDRESS("glCreateShaderObjectARB");
glShaderSourceARB = (PFNGLSHADERSOURCEARBPROC)
GETPROCADDRESS("glShaderSourceARB");
glCompileShaderARB = (PFNGLCOMPILESHADERARBPROC)
GETPROCADDRESS("glCompileShaderARB");
glCreateProgramObjectARB = (PFNGLCREATEPROGRAMOBJECTARBPROC)
GETPROCADDRESS("glCreateProgramObjectARB");
glAttachObjectARB = (PFNGLATTACHOBJECTARBPROC)
GETPROCADDRESS("glAttachObjectARB");
glLinkProgramARB = (PFNGLLINKPROGRAMARBPROC)
GETPROCADDRESS ("glLinkProgramARB");
glUseProgramObjectARB = (PFNGLUSEPROGRAMOBJECTARBPROC)
GETPROCADDRESS("glUseProgramObjectARB");
glGetUniformLocationARB = (PFNGLGETUNIFORMLOCATIONARBPROC)
GETPROCADDRESS("glGetUniformLocationARB");
glUniform1fARB = (PFNGLUNIFORM1FARBPROC)
GETPROCADDRESS("glUniform1fARB");
fragShader = glCreateShaderObjectARB (GL_FRAGMENT_SHADER_ARB);
glShaderSourceARB (fragShader, 1, &fragShaderText, NULL);
glCompileShaderARB (fragShader);
vertShader = glCreateShaderObjectARB (GL_VERTEX_SHADER_ARB);
glShaderSourceARB (vertShader, 1, &vertShaderText, NULL);
glCompileShaderARB (vertShader);
program = glCreateProgramObjectARB ();
glAttachObjectARB (program, fragShader);
glAttachObjectARB (program, vertShader);
glLinkProgramARB (program);
glUseProgramObjectARB (program);
uTime = glGetUniformLocationARB (program, "time");
glClearColor (0.0f, 0.1f, 0.3f, 1.0f);
glEnable (GL_CULL_FACE);
glEnable (GL_DEPTH_TEST);
printf ("GL_RENDERER = %s\n", (const char *) glGetString (GL_RENDERER));
}
int main (int argc, char *argv[])
{
glutInit (&argc, argv);
glutInitWindowPosition ( 0, 0);
glutInitWindowSize (200, 200);
glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow (argv[0]);
glutReshapeFunc (Reshape);
glutKeyboardFunc (Key);
glutDisplayFunc (Redisplay);
glutIdleFunc (Idle);
Init ();
glutMainLoop ();
return 0;
}
|
