| /** |
| * Another test for noise() functions (noise1 to noise4 tested independently). |
| * 13 Dec 2008 |
| */ |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/glew.h> |
| #include <GL/glut.h> |
| |
| static const char *VertShaderText = |
| "void main() {\n" |
| " gl_TexCoord[0].xyz = gl_Vertex.xyz;\n" |
| " gl_TexCoord[0].w = gl_MultiTexCoord1.x;\n" |
| " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" |
| "}\n"; |
| |
| static const char *FragShaderText[ 4 ] = { |
| "void main()\n" |
| "{\n" |
| " gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].w ) * 0.5 + 0.5;\n" |
| " gl_FragColor.a = 1;\n" |
| "}\n", |
| "void main()\n" |
| "{\n" |
| " gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].xw ) * 0.5 + 0.5;\n" |
| " gl_FragColor.a = 1;\n" |
| "}\n", |
| "void main()\n" |
| "{\n" |
| " gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].xyw ) * 0.5 + 0.5;\n" |
| " gl_FragColor.a = 1;\n" |
| "}\n", |
| "void main()\n" |
| "{\n" |
| " gl_FragColor.rgb = noise3( gl_TexCoord[ 0 ].xyzw ) * 0.5 + 0.5;\n" |
| " gl_FragColor.a = 1;\n" |
| "}\n" |
| }; |
| |
| struct uniform_info { |
| const char *name; |
| GLuint size; |
| GLint location; |
| GLfloat value[4]; |
| }; |
| |
| /* program/shader objects */ |
| static GLuint fragShader[ 4 ]; |
| static GLuint vertShader; |
| static GLuint program[ 4 ]; |
| |
| static GLint win = 0; |
| static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f; |
| static GLfloat Slice = 0.0; |
| static GLboolean Anim = GL_FALSE; |
| |
| |
| static void |
| Idle(void) |
| { |
| Slice += 0.01; |
| glutPostRedisplay(); |
| } |
| |
| |
| static void |
| Redisplay(void) |
| { |
| glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| |
| glMultiTexCoord1f( GL_TEXTURE1, Slice ); |
| |
| glPushMatrix(); |
| glRotatef(xRot, 1.0f, 0.0f, 0.0f); |
| glRotatef(yRot, 0.0f, 1.0f, 0.0f); |
| glRotatef(zRot, 0.0f, 0.0f, 1.0f); |
| |
| glutSolidTeapot( 1.0 ); |
| |
| 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(0.0f, 0.0f, -15.0f); |
| } |
| |
| |
| static void |
| CleanUp(void) |
| { |
| GLint i; |
| |
| glDeleteShader(vertShader); |
| for( i = 0; i < 4; i++ ) { |
| glDeleteShader(fragShader[ i ]); |
| glDeleteProgram(program[ i ]); |
| } |
| glutDestroyWindow(win); |
| } |
| |
| |
| static void |
| Key(unsigned char key, int x, int y) |
| { |
| const GLfloat step = 0.01; |
| (void) x; |
| (void) y; |
| |
| switch(key) { |
| case 'a': |
| Anim = !Anim; |
| glutIdleFunc(Anim ? Idle : NULL); |
| case 's': |
| Slice -= step; |
| break; |
| case 'S': |
| Slice += step; |
| break; |
| case 'z': |
| zRot -= 1.0; |
| break; |
| case 'Z': |
| zRot += 1.0; |
| break; |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| glUseProgram(program[ key - '1' ]); |
| break; |
| case 27: |
| CleanUp(); |
| exit(0); |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| static void |
| SpecialKey(int key, int x, int y) |
| { |
| const GLfloat step = 3.0f; |
| |
| (void) x; |
| (void) y; |
| |
| switch(key) { |
| case GLUT_KEY_UP: |
| xRot -= step; |
| break; |
| case GLUT_KEY_DOWN: |
| xRot += step; |
| break; |
| case GLUT_KEY_LEFT: |
| yRot -= step; |
| break; |
| case GLUT_KEY_RIGHT: |
| yRot += step; |
| break; |
| } |
| glutPostRedisplay(); |
| } |
| |
| |
| |
| static void |
| LoadAndCompileShader(GLuint shader, const char *text) |
| { |
| GLint stat; |
| |
| glShaderSource(shader, 1, (const GLchar **) &text, NULL); |
| |
| glCompileShader(shader); |
| |
| glGetShaderiv(shader, GL_COMPILE_STATUS, &stat); |
| if (!stat) { |
| GLchar log[1000]; |
| GLsizei len; |
| glGetShaderInfoLog(shader, 1000, &len, log); |
| fprintf(stderr, "noise: problem compiling shader: %s\n", log); |
| exit(1); |
| } |
| else { |
| printf("Shader compiled OK\n"); |
| } |
| } |
| |
| |
| static void |
| CheckLink(GLuint prog) |
| { |
| GLint stat; |
| glGetProgramiv(prog, GL_LINK_STATUS, &stat); |
| if (!stat) { |
| GLchar log[1000]; |
| GLsizei len; |
| glGetProgramInfoLog(prog, 1000, &len, log); |
| fprintf(stderr, "Linker error:\n%s\n", log); |
| } |
| else { |
| fprintf(stderr, "Link success!\n"); |
| } |
| } |
| |
| |
| static void |
| Init(void) |
| { |
| const char *version; |
| GLint i; |
| |
| version = (const char *) glGetString(GL_VERSION); |
| if (version[0] != '2' || version[1] != '.') { |
| printf("Warning: this program expects OpenGL 2.0\n"); |
| /*exit(1);*/ |
| } |
| |
| vertShader = glCreateShader(GL_VERTEX_SHADER); |
| LoadAndCompileShader(vertShader, VertShaderText); |
| |
| for( i = 0; i < 4; i++ ) { |
| fragShader[ i ] = glCreateShader(GL_FRAGMENT_SHADER); |
| LoadAndCompileShader(fragShader[ i ], FragShaderText[ i ]); |
| program[ i ] = glCreateProgram(); |
| glAttachShader(program[ i ], fragShader[ i ]); |
| glAttachShader(program[ i ], vertShader); |
| glLinkProgram(program[ i ]); |
| CheckLink(program[ i ]); |
| } |
| |
| glUseProgram(program[ 0 ]); |
| |
| assert(glGetError() == 0); |
| |
| glClearColor(0.4f, 0.4f, 0.8f, 0.0f); |
| |
| glColor3f(1, 0, 0); |
| |
| glFrontFace( GL_CW ); |
| glEnable( GL_CULL_FACE ); |
| glEnable( GL_DEPTH_TEST ); |
| } |
| |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| glutInit(&argc, argv); |
| glutInitWindowSize(400, 400); |
| glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); |
| win = glutCreateWindow(argv[0]); |
| glewInit(); |
| glutReshapeFunc(Reshape); |
| glutKeyboardFunc(Key); |
| glutSpecialFunc(SpecialKey); |
| glutDisplayFunc(Redisplay); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |
| |