progs/trivial/vp-tri-cb-tex.c

   1 /* Test glGenProgramsNV(), glIsProgramNV(), glLoadProgramNV() */
   2
   3 #include <stdio.h>
   4 #include <assert.h>
   5 #include <string.h>
   6 #include <stdlib.h>
   7 #include <math.h>
   8 #include <GL/glew.h>
   9 #include <GL/glut.h>
  10
  11
  12
  13 GLenum doubleBuffer;
  14
  15 static void Init(void)
  16 {
  17    GLint errno;
  18    GLuint prognum;
  19
  20    static const char *prog1 =
  21       "!!ARBvp1.0\n"
  22       "PARAM Emission = state.material.emission; \n"
  23       "PARAM Ambient = state.material.ambient; \n"
  24       "PARAM Diffuse = state.material.diffuse; \n"
  25       "PARAM Specular = state.material.specular; \n"
  26       "DP4  result.position.x, Ambient, vertex.position;\n"
  27       "DP4  result.position.y, Diffuse, vertex.position;\n"
  28       "DP4  result.position.z, Specular, vertex.position;\n"
  29       "DP4  result.position.w, Emission, vertex.position;\n"
  30       "MOV  result.texcoord[0], vertex.texcoord[0];\n"
  31       "END\n";
  32
  33    const float Ambient[4] = { 0.0, 1.0, 0.0, 0.0 };
  34    const float Diffuse[4] = { 1.0, 0.0, 0.0, 0.0 };
  35    const float Specular[4] = { 0.0, 0.0, 1.0, 0.0 };
  36    const float Emission[4] = { 0.0, 0.0, 0.0, 1.0 };
  37    glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, Ambient);
  38    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, Diffuse);
  39    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, Specular);
  40    glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, Emission);
  41
  42
  43    glGenProgramsARB(1, &prognum);
  44
  45    glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
  46    glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  47                       strlen(prog1), (const GLubyte *) prog1);
  48
  49    assert(glIsProgramARB(prognum));
  50    errno = glGetError();
  51    printf("glGetError = %d\n", errno);
  52    if (errno != GL_NO_ERROR)
  53    {
  54       GLint errorpos;
  55
  56       glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
  57       printf("errorpos: %d\n", errorpos);
  58       printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  59    }
  60
  61    glEnable(GL_VERTEX_PROGRAM_NV);
  62
  63 #define SIZE 32
  64    {
  65       GLubyte tex2d[SIZE][SIZE][3];
  66       GLint s, t;
  67
  68       for (s = 0; s < SIZE; s++) {
  69          for (t = 0; t < SIZE; t++) {
  70 #if 0
  71             tex2d[t][s][0] = (s < SIZE/2) ? 0 : 255;
  72             tex2d[t][s][1] = (t < SIZE/2) ? 0 : 255;
  73             tex2d[t][s][2] = 0;
  74 #else
  75             tex2d[t][s][0] = s*255/(SIZE-1);
  76             tex2d[t][s][1] = t*255/(SIZE-1);
  77             tex2d[t][s][2] = 0;
  78 #endif
  79          }
  80       }
  81
  82       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  83
  84       glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
  85                    GL_RGB, GL_UNSIGNED_BYTE, tex2d);
  86
  87       glEnable(GL_TEXTURE_2D);
  88       glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
  89       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
  90       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  91       glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  92
  93       glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
  94    }
  95
  96 }
  97
  98
  99 static void Reshape(int width, int height)
 100 {
 101
 102     glViewport(0, 0, (GLint)width, (GLint)height);
 103
 104     glMatrixMode(GL_PROJECTION);
 105     glLoadIdentity();
 106 /*     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
 107     glMatrixMode(GL_MODELVIEW);
 108 }
 109
 110 static void Key(unsigned char key, int x, int y)
 111 {
 112
 113     switch (key) {
 114       case 27:
 115         exit(1);
 116       default:
 117         return;
 118     }
 119
 120     glutPostRedisplay();
 121 }
 122
 123 static void Draw(void)
 124 {
 125    glClear(GL_COLOR_BUFFER_BIT);
 126
 127    glBegin(GL_TRIANGLES);
 128    glTexCoord2f(1,-1);
 129    glVertex3f( 0.9, -0.9, -0.0);
 130    glTexCoord2f(1,1);
 131    glVertex3f( 0.9,  0.9, -0.0);
 132    glTexCoord2f(-1,0);
 133    glVertex3f(-0.9,  0.0, -0.0);
 134    glEnd();
 135
 136    glFlush();
 137
 138    if (doubleBuffer) {
 139       glutSwapBuffers();
 140    }
 141 }
 142
 143 static GLenum Args(int argc, char **argv)
 144 {
 145     GLint i;
 146
 147     doubleBuffer = GL_FALSE;
 148
 149     for (i = 1; i < argc; i++) {
 150         if (strcmp(argv[i], "-sb") == 0) {
 151             doubleBuffer = GL_FALSE;
 152         } else if (strcmp(argv[i], "-db") == 0) {
 153             doubleBuffer = GL_TRUE;
 154         } else {
 155             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 156             return GL_FALSE;
 157         }
 158     }
 159     return GL_TRUE;
 160 }
 161
 162 int main(int argc, char **argv)
 163 {
 164     GLenum type;
 165
 166     glutInit(&argc, argv);
 167
 168     if (Args(argc, argv) == GL_FALSE) {
 169         exit(1);
 170     }
 171
 172     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 173
 174     type = GLUT_RGB | GLUT_ALPHA;
 175     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 176     glutInitDisplayMode(type);
 177
 178     if (glutCreateWindow("First Tri") == GL_FALSE) {
 179         exit(1);
 180     }
 181
 182     glewInit();
 183
 184     Init();
 185
 186     glutReshapeFunc(Reshape);
 187     glutKeyboardFunc(Key);
 188     glutDisplayFunc(Draw);
 189     glutMainLoop();
 190         return 0;
 191 }