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
|
/* Test GL_ARB_fragment_program */
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define GL_GLEXT_PROTOTYPES
#include <GL/glut.h>
static void Display( void )
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glPushMatrix();
glColor4f(0, 0.5, 0, 1);
glColor4f(0, 1, 0, 1);
glBegin(GL_POLYGON);
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 0, 1);
glEnd();
glPopMatrix();
glutSwapBuffers();
}
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( 0.0, 0.0, -15.0 );
}
static void Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 27:
exit(0);
break;
}
glutPostRedisplay();
}
static void load_program(const char *prog, GLuint prognum)
{
int a;
GLint errorpos, errno;
glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prognum);
glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
strlen(prog), (const GLubyte *) prog);
assert(glIsProgramARB(prognum));
errno = glGetError();
printf("glGetError = %d\n", errno);
if (errno != GL_NO_ERROR)
{
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
printf("errorpos: %d\n", errorpos);
printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
for (a=-10; a<10; a++)
{
if ((errorpos+a < 0) || (errorpos+a >= strlen(prog))) continue;
printf("%c", prog[errorpos+a]);
}
printf("\n");
exit(1);
}
}
static void Init( void )
{
static const char *prog0 =
"!!ARBfp1.0\n"
"TEMP R0, RC, HC, H0, H1, H2, H3, H30 ;\n"
"MUL result.color, R0, fragment.position; \n"
"ADD result.color, H3, fragment.texcoord; \n"
"ADD_SAT result.color, H3, fragment.texcoord; \n"
"MUL result.color.xy, R0.wzyx, fragment.position; \n"
"MUL result.color, H0, fragment.position; \n"
"MUL result.color, -H0, fragment.position; \n"
"MOV RC, H1; \n"
"MOV HC, H2; \n"
"END \n"
;
/* masked updates, defines, declarations */
static const char *prog1 =
"!!ARBfp1.0\n"
"PARAM foo = {1., 2., 3., 4.}; \n"
"PARAM foo2 = 5.; \n"
"PARAM foo3 = {5., 6., 7., 8.}; \n"
"PARAM bar = 3.; \n"
"TEMP R0, R1, RC, EQ, NE, bar2; \n"
"ALIAS bar3 = bar; \n"
"MOV result.color.xy, R0; \n"
"MOV result.color, R0; \n"
"MOV result.color.xyzw, R0; \n"
"MOV result.color.xy, R0; \n"
"MOV RC.x, R1.x; \n"
"KIL NE; \n"
"KIL EQ.xyxy; \n"
"END \n"
;
/* texture instructions */
static const char *prog2 =
"!!ARBfp1.0\n"
"TEMP R0, R1, R2, R3;\n"
"TEX R0, fragment.texcoord, texture[1], 2D; \n"
"TEX R1, fragment.texcoord[1], texture[1], CUBE; \n"
"TEX R2, fragment.texcoord[2], texture[2], 3D; \n"
"TXP R3, fragment.texcoord[3], texture[3], RECT; \n"
"MUL result.color, R0, fragment.color; \n"
"END \n"
;
/* test negation, absolute value */
static const char *prog3 =
"!!ARBfp1.0\n"
"TEMP R0, R1;\n"
"MOV R0, R1; \n"
"MOV R0, -R1; \n"
"MOV result.color, R0; \n"
"END \n"
;
/* literal constant sources */
static const char *prog4 =
"!!ARBfp1.0\n"
"TEMP R0, R1;\n"
"PARAM Pi = 3.14159; \n"
"MOV R0, {1., -2., +3., 4.}; \n"
"MOV R0, 5.; \n"
"MOV R0, -5.; \n"
"MOV R0, 5.; \n"
"MOV R0, Pi; \n"
"MOV result.color, R0; \n"
"END \n"
;
/* change the fragment color in a simple way */
static const char *prog10 =
"!!ARBfp1.0\n"
"PARAM blue = {0., 0., 1., 0.};\n"
"PARAM color = {1., 0., 0., 1.};\n"
"TEMP R0; \n"
"MOV R0, fragment.color; \n"
"#ADD result.color, R0, fragment.color; \n"
"#ADD result.color, blue, fragment.color; \n"
"#ADD result.color, {1., 0., 0., 0.}, fragment.color; \n"
"ADD result.color, color, fragment.color; \n"
"END \n"
;
GLuint progs[20];
glGenProgramsARB(20, progs);
assert(progs[0]);
assert(progs[1]);
assert(progs[0] != progs[1]);
printf("program 0:\n");
load_program(prog0, progs[0]);
printf("program 1:\n");
load_program(prog1, progs[1]);
printf("program 2:\n");
load_program(prog2, progs[2]);
printf("program 3:\n");
load_program(prog3, progs[3]);
printf("program 4:\n");
load_program(prog4, progs[4]);
printf("program 10:\n");
load_program(prog10, progs[5]);
glEnable(GL_FRAGMENT_PROGRAM_ARB);
glEnable(GL_ALPHA_TEST);
glAlphaFunc(GL_ALWAYS, 0.0);
}
int main( int argc, char *argv[] )
{
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 250, 250 );
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
glutCreateWindow(argv[0]);
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
Init();
glutMainLoop();
return 0;
}
|
