| /** |
| * Test noise() functions. |
| * 28 Jan 2007 |
| */ |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/gl.h> |
| #include <GL/glut.h> |
| #include <GL/glext.h> |
| #include "extfuncs.h" |
| |
| |
| static const char *VertShaderText = |
| "void main() {\n" |
| " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" |
| " gl_TexCoord[0] = gl_MultiTexCoord0;\n" |
| "}\n"; |
| |
| static const char *FragShaderText = |
| "uniform vec4 Scale, Bias;\n" |
| "uniform float Slice;\n" |
| "void main()\n" |
| "{\n" |
| " vec4 scale = vec4(5.0);\n" |
| " vec4 p;\n" |
| " p.xy = gl_TexCoord[0].xy;\n" |
| " p.z = Slice;\n" |
| " vec4 n = noise4(p * scale);\n" |
| " gl_FragColor = n * Scale + Bias;\n" |
| "}\n"; |
| |
| |
| struct uniform_info { |
| const char *name; |
| GLuint size; |
| GLint location; |
| GLfloat value[4]; |
| }; |
| |
| static struct uniform_info Uniforms[] = { |
| { "Scale", 4, -1, { 0.5, 0.4, 0.0, 0} }, |
| { "Bias", 4, -1, { 0.5, 0.3, 0.0, 0} }, |
| { "Slice", 1, -1, { 0.5, 0, 0, 0} }, |
| { NULL, 0, 0, { 0, 0, 0, 0 } } |
| }; |
| |
| /* program/shader objects */ |
| static GLuint fragShader; |
| static GLuint vertShader; |
| static GLuint program; |
| |
| 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); |
| |
| glUniform1fv_func(Uniforms[2].location, 1, &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); |
| |
| glBegin(GL_POLYGON); |
| glTexCoord2f(0, 0); glVertex2f(-2, -2); |
| glTexCoord2f(1, 0); glVertex2f( 2, -2); |
| glTexCoord2f(1, 1); glVertex2f( 2, 2); |
| glTexCoord2f(0, 1); glVertex2f(-2, 2); |
| glEnd(); |
| |
| 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) |
| { |
| glDeleteShader_func(fragShader); |
| glDeleteShader_func(vertShader); |
| glDeleteProgram_func(program); |
| 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 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_func(shader, 1, (const GLchar **) &text, NULL); |
| |
| glCompileShader_func(shader); |
| |
| glGetShaderiv_func(shader, GL_COMPILE_STATUS, &stat); |
| if (!stat) { |
| GLchar log[1000]; |
| GLsizei len; |
| glGetShaderInfoLog_func(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_func(prog, GL_LINK_STATUS, &stat); |
| if (!stat) { |
| GLchar log[1000]; |
| GLsizei len; |
| glGetProgramInfoLog_func(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);*/ |
| } |
| |
| GetExtensionFuncs(); |
| |
| vertShader = glCreateShader_func(GL_VERTEX_SHADER); |
| LoadAndCompileShader(vertShader, VertShaderText); |
| |
| fragShader = glCreateShader_func(GL_FRAGMENT_SHADER); |
| LoadAndCompileShader(fragShader, FragShaderText); |
| |
| program = glCreateProgram_func(); |
| glAttachShader_func(program, fragShader); |
| glAttachShader_func(program, vertShader); |
| glLinkProgram_func(program); |
| CheckLink(program); |
| glUseProgram_func(program); |
| |
| for (i = 0; Uniforms[i].name; i++) { |
| Uniforms[i].location |
| = glGetUniformLocation_func(program, Uniforms[i].name); |
| printf("Uniform %s location: %d\n", Uniforms[i].name, |
| Uniforms[i].location); |
| switch (Uniforms[i].size) { |
| case 1: |
| glUniform1fv_func(Uniforms[i].location, 1, Uniforms[i].value); |
| break; |
| case 2: |
| glUniform2fv_func(Uniforms[i].location, 1, Uniforms[i].value); |
| break; |
| case 3: |
| glUniform3fv_func(Uniforms[i].location, 1, Uniforms[i].value); |
| break; |
| case 4: |
| glUniform4fv_func(Uniforms[i].location, 1, Uniforms[i].value); |
| break; |
| default: |
| abort(); |
| } |
| } |
| |
| assert(glGetError() == 0); |
| |
| glClearColor(0.4f, 0.4f, 0.8f, 0.0f); |
| |
| printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER)); |
| |
| assert(glIsProgram_func(program)); |
| assert(glIsShader_func(fragShader)); |
| assert(glIsShader_func(vertShader)); |
| |
| glColor3f(1, 0, 0); |
| } |
| |
| |
| int |
| main(int argc, char *argv[]) |
| { |
| glutInit(&argc, argv); |
| glutInitWindowPosition( 0, 0); |
| glutInitWindowSize(400, 400); |
| glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); |
| win = glutCreateWindow(argv[0]); |
| glutReshapeFunc(Reshape); |
| glutKeyboardFunc(Key); |
| glutSpecialFunc(SpecialKey); |
| glutDisplayFunc(Redisplay); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |
| |