summaryrefslogtreecommitdiffstats
path: root/progs/trivial/vp-tri-cb-tex.c
blob: e543e2ec3fd8962598da106dec0c84dbac64a110 (plain)
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
/* Test glGenProgramsNV(), glIsProgramNV(), glLoadProgramNV() */

#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glew.h>
#include <GL/glut.h>



GLenum doubleBuffer;

static void Init(void)
{
   GLint errno;
   GLuint prognum;
   
   static const char *prog1 =
      "!!ARBvp1.0\n"
      "PARAM Emission = state.material.emission; \n"
      "PARAM Ambient = state.material.ambient; \n"
      "PARAM Diffuse = state.material.diffuse; \n"
      "PARAM Specular = state.material.specular; \n"
      "DP4  result.position.x, Ambient, vertex.position;\n"
      "DP4  result.position.y, Diffuse, vertex.position;\n"
      "DP4  result.position.z, Specular, vertex.position;\n"
      "DP4  result.position.w, Emission, vertex.position;\n"
      "MOV  result.texcoord[0], vertex.texcoord[0];\n"
      "END\n";

   const float Ambient[4] = { 0.0, 1.0, 0.0, 0.0 };
   const float Diffuse[4] = { 1.0, 0.0, 0.0, 0.0 };
   const float Specular[4] = { 0.0, 0.0, 1.0, 0.0 };
   const float Emission[4] = { 0.0, 0.0, 0.0, 1.0 };
   glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, Ambient);
   glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, Diffuse);
   glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, Specular);
   glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, Emission);


   glGenProgramsARB(1, &prognum);

   glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
   glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
		      strlen(prog1), (const GLubyte *) prog1);

   assert(glIsProgramARB(prognum));
   errno = glGetError();
   printf("glGetError = %d\n", errno);
   if (errno != GL_NO_ERROR)
   {
      GLint errorpos;

      glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
      printf("errorpos: %d\n", errorpos);
      printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
   }

   glEnable(GL_VERTEX_PROGRAM_NV);

#define SIZE 32
   {
      GLubyte tex2d[SIZE][SIZE][3];
      GLint s, t;

      for (s = 0; s < SIZE; s++) {
	 for (t = 0; t < SIZE; t++) {
#if 0
	    tex2d[t][s][0] = (s < SIZE/2) ? 0 : 255;
	    tex2d[t][s][1] = (t < SIZE/2) ? 0 : 255;
	    tex2d[t][s][2] = 0;
#else
	    tex2d[t][s][0] = s*255/(SIZE-1);
	    tex2d[t][s][1] = t*255/(SIZE-1);
	    tex2d[t][s][2] = 0;
#endif
	 }
      }

      glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

      glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
                   GL_RGB, GL_UNSIGNED_BYTE, tex2d);

      glEnable(GL_TEXTURE_2D);
      glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
      glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

      glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
   }

}


static void Reshape(int width, int height)
{

    glViewport(0, 0, (GLint)width, (GLint)height);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
/*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
    glMatrixMode(GL_MODELVIEW);
}

static void Key(unsigned char key, int x, int y)
{

    switch (key) {
      case 27:
	exit(1);
      default:
	break;
    }

    glutPostRedisplay();
}

static void Draw(void)
{
   glClear(GL_COLOR_BUFFER_BIT); 

   glBegin(GL_TRIANGLES);
   glTexCoord2f(1,-1); 
   glVertex3f( 0.9, -0.9, -0.0);
   glTexCoord2f(1,1); 
   glVertex3f( 0.9,  0.9, -0.0);
   glTexCoord2f(-1,0); 
   glVertex3f(-0.9,  0.0, -0.0);
   glEnd();

   glFlush();

   if (doubleBuffer) {
      glutSwapBuffers();
   }
}

static GLenum Args(int argc, char **argv)
{
    GLint i;

    doubleBuffer = GL_FALSE;

    for (i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-sb") == 0) {
	    doubleBuffer = GL_FALSE;
	} else if (strcmp(argv[i], "-db") == 0) {
	    doubleBuffer = GL_TRUE;
	} else {
	    fprintf(stderr, "%s (Bad option).\n", argv[i]);
	    return GL_FALSE;
	}
    }
    return GL_TRUE;
}

int main(int argc, char **argv)
{
    GLenum type;

    glutInit(&argc, argv);

    if (Args(argc, argv) == GL_FALSE) {
	exit(1);
    }

    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);

    type = GLUT_RGB | GLUT_ALPHA;
    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
    glutInitDisplayMode(type);

    if (glutCreateWindow(*argv) == GL_FALSE) {
	exit(1);
    }

    glewInit();

    Init();

    glutReshapeFunc(Reshape);
    glutKeyboardFunc(Key);
    glutDisplayFunc(Draw);
    glutMainLoop();
	return 0;
}