progs/glsl/multinoise.c

   1 /**
   2  * Another test for noise() functions (noise1 to noise4 tested independently).
   3  * 13 Dec 2008
   4  */
   5
   6 #include <assert.h>
   7 #include <string.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <math.h>
  11 #include <GL/glew.h>
  12 #include <GL/glut.h>
  13
  14 static const char *VertShaderText =
  15    "void main() {\n"
  16    "   gl_TexCoord[0].xyz = gl_Vertex.xyz;\n"
  17    "   gl_TexCoord[0].w = gl_MultiTexCoord1.x;\n"
  18    "   gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n"
  19    "}\n";
  20
  21 static const char *FragShaderText[ 4 ] = {
  22    "void main()\n"
  23    "{\n"
  24    "   gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].w ) * 0.5 + 0.5;\n"
  25    "   gl_FragColor.a = 1.0;\n"
  26    "}\n",
  27    "void main()\n"
  28    "{\n"
  29    "   gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].xw ) * 0.5 + 0.5;\n"
  30    "   gl_FragColor.a = 1.0;\n"
  31    "}\n",
  32    "void main()\n"
  33    "{\n"
  34    "   gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].xyw ) * 0.5 + 0.5;\n"
  35    "   gl_FragColor.a = 1.0;\n"
  36    "}\n",
  37    "void main()\n"
  38    "{\n"
  39    "   gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].xyzw ) * 0.5 + 0.5;\n"
  40    "   gl_FragColor.a = 1.0;\n"
  41    "}\n"
  42 };
  43
  44 struct uniform_info {
  45    const char *name;
  46    GLuint size;
  47    GLint location;
  48    GLfloat value[4];
  49 };
  50
  51 /* program/shader objects */
  52 static GLuint fragShader[ 4 ];
  53 static GLuint vertShader;
  54 static GLuint program[ 4 ];
  55
  56 static GLint win = 0;
  57 static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f;
  58 static GLfloat Slice = 0.0;
  59 static GLboolean Anim = GL_FALSE;
  60
  61
  62 static void
  63 Idle(void)
  64 {
  65    Slice += 0.01;
  66    glutPostRedisplay();
  67 }
  68
  69
  70 static void
  71 Redisplay(void)
  72 {
  73    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  74
  75    glMultiTexCoord1f( GL_TEXTURE1, Slice );
  76
  77    glPushMatrix();
  78    glRotatef(xRot, 1.0f, 0.0f, 0.0f);
  79    glRotatef(yRot, 0.0f, 1.0f, 0.0f);
  80    glRotatef(zRot, 0.0f, 0.0f, 1.0f);
  81
  82    glutSolidTeapot( 1.0 );
  83
  84    glPopMatrix();
  85
  86    glutSwapBuffers();
  87 }
  88
  89
  90 static void
  91 Reshape(int width, int height)
  92 {
  93    glViewport(0, 0, width, height);
  94    glMatrixMode(GL_PROJECTION);
  95    glLoadIdentity();
  96    glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
  97    glMatrixMode(GL_MODELVIEW);
  98    glLoadIdentity();
  99    glTranslatef(0.0f, 0.0f, -15.0f);
 100 }
 101
 102
 103 static void
 104 CleanUp(void)
 105 {
 106    GLint i;
 107
 108    glDeleteShader(vertShader);
 109    for( i = 0; i < 4; i++ ) {
 110       glDeleteShader(fragShader[ i ]);
 111       glDeleteProgram(program[ i ]);
 112    }
 113    glutDestroyWindow(win);
 114 }
 115
 116
 117 static void
 118 Key(unsigned char key, int x, int y)
 119 {
 120    const GLfloat step = 0.01;
 121   (void) x;
 122   (void) y;
 123
 124    switch(key) {
 125    case 'a':
 126       Anim = !Anim;
 127       glutIdleFunc(Anim ? Idle : NULL);
 128       break;
 129    case 's':
 130       Slice -= step;
 131       break;
 132    case 'S':
 133       Slice += step;
 134       break;
 135    case 'z':
 136       zRot -= 1.0;
 137       break;
 138    case 'Z':
 139       zRot += 1.0;
 140       break;
 141    case '1':
 142    case '2':
 143    case '3':
 144    case '4':
 145       glUseProgram(program[ key - '1' ]);
 146       break;
 147    case 27:
 148       CleanUp();
 149       exit(0);
 150       break;
 151    }
 152    glutPostRedisplay();
 153 }
 154
 155
 156 static void
 157 SpecialKey(int key, int x, int y)
 158 {
 159    const GLfloat step = 3.0f;
 160
 161   (void) x;
 162   (void) y;
 163
 164    switch(key) {
 165    case GLUT_KEY_UP:
 166       xRot -= step;
 167       break;
 168    case GLUT_KEY_DOWN:
 169       xRot += step;
 170       break;
 171    case GLUT_KEY_LEFT:
 172       yRot -= step;
 173       break;
 174    case GLUT_KEY_RIGHT:
 175       yRot += step;
 176       break;
 177    }
 178    glutPostRedisplay();
 179 }
 180
 181
 182
 183 static void
 184 LoadAndCompileShader(GLuint shader, const char *text)
 185 {
 186    GLint stat;
 187
 188    glShaderSource(shader, 1, (const GLchar **) &text, NULL);
 189
 190    glCompileShader(shader);
 191
 192    glGetShaderiv(shader, GL_COMPILE_STATUS, &stat);
 193    if (!stat) {
 194       GLchar log[1000];
 195       GLsizei len;
 196       glGetShaderInfoLog(shader, 1000, &len, log);
 197       fprintf(stderr, "multinoise: problem compiling shader: %s\n", log);
 198       exit(1);
 199    }
 200    else {
 201       printf("Shader compiled OK\n");
 202    }
 203 }
 204
 205
 206 static void
 207 CheckLink(GLuint prog)
 208 {
 209    GLint stat;
 210    glGetProgramiv(prog, GL_LINK_STATUS, &stat);
 211    if (!stat) {
 212       GLchar log[1000];
 213       GLsizei len;
 214       glGetProgramInfoLog(prog, 1000, &len, log);
 215       fprintf(stderr, "Linker error:\n%s\n", log);
 216    }
 217    else {
 218       fprintf(stderr, "Link success!\n");
 219    }
 220 }
 221
 222
 223 static void
 224 Init(void)
 225 {
 226    const char *version;
 227    GLint i;
 228
 229    version = (const char *) glGetString(GL_VERSION);
 230    if (version[0] != '2' || version[1] != '.') {
 231       printf("Warning: this program expects OpenGL 2.0\n");
 232       /*exit(1);*/
 233    }
 234
 235    vertShader = glCreateShader(GL_VERTEX_SHADER);
 236    LoadAndCompileShader(vertShader, VertShaderText);
 237
 238    for( i = 0; i < 4; i++ ) {
 239       fragShader[ i ] = glCreateShader(GL_FRAGMENT_SHADER);
 240       LoadAndCompileShader(fragShader[ i ], FragShaderText[ i ]);
 241       program[ i ] = glCreateProgram();
 242       glAttachShader(program[ i ], fragShader[ i ]);
 243       glAttachShader(program[ i ], vertShader);
 244       glLinkProgram(program[ i ]);
 245       CheckLink(program[ i ]);
 246    }
 247
 248    glUseProgram(program[ 0 ]);
 249
 250    assert(glGetError() == 0);
 251
 252    glClearColor(0.4f, 0.4f, 0.8f, 0.0f);
 253
 254    glColor3f(1, 0, 0);
 255
 256    glFrontFace( GL_CW );
 257    glEnable( GL_CULL_FACE );
 258    glEnable( GL_DEPTH_TEST );
 259 }
 260
 261
 262 int
 263 main(int argc, char *argv[])
 264 {
 265    glutInit(&argc, argv);
 266    glutInitWindowSize(400, 400);
 267    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
 268    win = glutCreateWindow(argv[0]);
 269    glewInit();
 270    glutReshapeFunc(Reshape);
 271    glutKeyboardFunc(Key);
 272    glutSpecialFunc(SpecialKey);
 273    glutDisplayFunc(Redisplay);
 274    Init();
 275    glutMainLoop();
 276    return 0;
 277 }
 278