src/tests/floattex.c

   1 /*
   2  * Test floating point textures.
   3  * No actual rendering, yet.
   4  */
   5
   6
   7 #include <assert.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <math.h>
  11 #include <GL/glut.h>
  12
  13
  14 /* XXX - temporary */
  15 #ifndef GL_ARB_texture_float
  16 #define GL_ARB_texture_float 1
  17 #define GL_TEXTURE_RED_TYPE_ARB             0x9000
  18 #define GL_TEXTURE_GREEN_TYPE_ARB           0x9001
  19 #define GL_TEXTURE_BLUE_TYPE_ARB            0x9002
  20 #define GL_TEXTURE_ALPHA_TYPE_ARB           0x9003
  21 #define GL_TEXTURE_LUMINANCE_TYPE_ARB       0x9004
  22 #define GL_TEXTURE_INTENSITY_TYPE_ARB       0x9005
  23 #define GL_TEXTURE_DEPTH_TYPE_ARB           0x9006
  24 #define GL_UNSIGNED_NORMALIZED_ARB          0x9007
  25 #define GL_RGBA32F_ARB                      0x8814
  26 #define GL_RGB32F_ARB                       0x8815
  27 #define GL_ALPHA32F_ARB                     0x8816
  28 #define GL_INTENSITY32F_ARB                 0x8817
  29 #define GL_LUMINANCE32F_ARB                 0x8818
  30 #define GL_LUMINANCE_ALPHA32F_ARB           0x8819
  31 #define GL_RGBA16F_ARB                      0x881A
  32 #define GL_RGB16F_ARB                       0x881B
  33 #define GL_ALPHA16F_ARB                     0x881C
  34 #define GL_INTENSITY16F_ARB                 0x881D
  35 #define GL_LUMINANCE16F_ARB                 0x881E
  36 #define GL_LUMINANCE_ALPHA16F_ARB           0x881F
  37 #endif
  38
  39
  40 static GLboolean
  41 CheckError( int line )
  42 {
  43    GLenum error = glGetError();
  44    if (error) {
  45       char *err = (char *) gluErrorString( error );
  46       fprintf( stderr, "GL Error: %s at line %d\n", err, line );
  47       return GL_TRUE;
  48    }
  49    return GL_FALSE;
  50 }
  51
  52
  53 static void
  54 Draw(void)
  55 {
  56    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  57
  58    glPushMatrix();
  59
  60    glutSolidCube(2.0);
  61
  62    glPopMatrix();
  63
  64    glutSwapBuffers();
  65 }
  66
  67
  68 static void
  69 Reshape(int width, int height)
  70 {
  71    glViewport(0, 0, width, height);
  72    glMatrixMode(GL_PROJECTION);
  73    glLoadIdentity();
  74    glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
  75    glMatrixMode(GL_MODELVIEW);
  76    glLoadIdentity();
  77    glTranslatef(0.0, 0.0, -15.0);
  78 }
  79
  80
  81 static void
  82 Key(unsigned char key, int x, int y)
  83 {
  84    (void) x;
  85    (void) y;
  86    switch (key) {
  87       case 27:
  88          exit(0);
  89          break;
  90    }
  91    glutPostRedisplay();
  92 }
  93
  94
  95
  96 static void
  97 Init(void)
  98 {
  99    GLfloat tex[16][16][4];
 100    GLfloat tex2[16][16][4];
 101    GLint i, j, t;
 102
 103    if (!glutExtensionSupported("GL_MESAX_texture_float")) {
 104       printf("Sorry, this test requires GL_MESAX_texture_float\n");
 105       exit(1);
 106    }
 107
 108    for (i = 0; i < 16; i++) {
 109       for (j = 0; j < 16; j++) {
 110          GLfloat s = i / 15.0;
 111          tex[i][j][0] = s;
 112          tex[i][j][1] = 2.0 * s;
 113          tex[i][j][2] = -3.0 * s;
 114          tex[i][j][3] = 4.0 * s;
 115       }
 116    }
 117
 118    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB, 16, 16, 0, GL_RGBA,
 119                 GL_FLOAT, tex);
 120    CheckError(__LINE__);
 121
 122    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_TYPE_ARB, &t);
 123    assert(t == GL_FLOAT);
 124    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_TYPE_ARB, &t);
 125    assert(t == GL_FLOAT);
 126    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_TYPE_ARB, &t);
 127    assert(t == GL_FLOAT);
 128    glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_TYPE_ARB, &t);
 129    assert(t == GL_FLOAT);
 130
 131    CheckError(__LINE__);
 132
 133    /* read back the texture and make sure values are correct */
 134    glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_FLOAT, tex2);
 135    CheckError(__LINE__);
 136    for (i = 0; i < 16; i++) {
 137       for (j = 0; j < 16; j++) {
 138          if (tex[i][j][0] != tex2[i][j][0] ||
 139              tex[i][j][1] != tex2[i][j][1] ||
 140              tex[i][j][2] != tex2[i][j][2] ||
 141              tex[i][j][3] != tex2[i][j][3]) {
 142             printf("tex[%d][%d] %g %g %g %g != tex2[%d][%d] %g %g %g %g\n",
 143                    i, j,
 144                    tex[i][j][0], tex[i][j][1], tex[i][j][2], tex[i][j][3],
 145                    i, j,
 146                    tex2[i][j][0], tex2[i][j][1], tex2[i][j][2], tex2[i][j][3]);
 147          }
 148       }
 149    }
 150
 151
 152 }
 153
 154
 155 int
 156 main(int argc, char *argv[])
 157 {
 158    glutInit(&argc, argv);
 159    glutInitWindowPosition(0, 0);
 160    glutInitWindowSize(400, 400);
 161    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
 162    glutCreateWindow(argv[0]);
 163    glutReshapeFunc(Reshape);
 164    glutKeyboardFunc(Key);
 165    glutDisplayFunc(Draw);
 166    Init();
 167    glutMainLoop();
 168    return 0;
 169 }