/** * "Toy Ball" shader demo. Uses the example shaders from * chapter 11 of the OpenGL Shading Language "orange" book. * 16 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" #include "shaderutil.h" static char *FragProgFile = "CH11-toyball.frag"; static char *VertProgFile = "CH11-toyball.vert"; /* program/shader objects */ static GLuint fragShader; static GLuint vertShader; static GLuint program; static struct uniform_info Uniforms[] = { { "LightDir", 4, GL_FLOAT, { 0.57737, 0.57735, 0.57735, 0.0 }, -1 }, { "HVector", 4, GL_FLOAT, { 0.32506, 0.32506, 0.88808, 0.0 }, -1 }, { "BallCenter", 4, GL_FLOAT, { 0.0, 0.0, 0.0, 1.0 }, -1 }, { "SpecularColor", 4, GL_FLOAT, { 0.4, 0.4, 0.4, 60.0 }, -1 }, { "Red", 4, GL_FLOAT, { 0.6, 0.0, 0.0, 1.0 }, -1 }, { "Blue", 4, GL_FLOAT, { 0.0, 0.3, 0.6, 1.0 }, -1 }, { "Yellow", 4, GL_FLOAT, { 0.6, 0.5, 0.0, 1.0 }, -1 }, { "HalfSpace0", 4, GL_FLOAT, { 1.0, 0.0, 0.0, 0.2 }, -1 }, { "HalfSpace1", 4, GL_FLOAT, { 0.309016994, 0.951056516, 0.0, 0.2 }, -1 }, { "HalfSpace2", 4, GL_FLOAT, { -0.809016994, 0.587785252, 0.0, 0.2 }, -1 }, { "HalfSpace3", 4, GL_FLOAT, { -0.809016994, -0.587785252, 0.0, 0.2 }, -1 }, { "HalfSpace4", 4, GL_FLOAT, { 0.309116994, -0.951056516, 0.0, 0.2 }, -1 }, { "InOrOutInit", 1, GL_FLOAT, { -3.0, 0, 0, 0 }, -1 }, { "StripeWidth", 1, GL_FLOAT, { 0.3, 0, 0, 0 }, -1 }, { "FWidth", 1, GL_FLOAT, { 0.005, 0, 0, 0 }, -1 }, END_OF_UNIFORMS }; static GLint win = 0; static GLboolean Anim = GL_FALSE; static GLfloat TexRot = 0.0; static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f; static void Idle(void) { TexRot += 2.0; if (TexRot > 360.0) TexRot -= 360.0; glutPostRedisplay(); } static void Redisplay(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 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); glMatrixMode(GL_TEXTURE); glLoadIdentity(); glRotatef(TexRot, 0.0f, 1.0f, 0.0f); glMatrixMode(GL_MODELVIEW); glutSolidSphere(2.0, 20, 10); 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 = 2.0; (void) x; (void) y; switch(key) { case 'a': Anim = !Anim; if (Anim) glutIdleFunc(Idle); else glutIdleFunc(NULL); break; case 'z': zRot += step; break; case 'Z': zRot -= step; break; case 27: CleanUp(); exit(0); break; } glutPostRedisplay(); } static void SpecialKey(int key, int x, int y) { const GLfloat step = 2.0; (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 Init(void) { if (!ShadersSupported()) exit(1); GetExtensionFuncs(); vertShader = CompileShaderFile(GL_VERTEX_SHADER, VertProgFile); fragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragProgFile); program = LinkShaders(vertShader, fragShader); glUseProgram_func(program); InitUniforms(program, Uniforms); assert(glGetError() == 0); glClearColor(0.4f, 0.4f, 0.8f, 0.0f); glEnable(GL_DEPTH_TEST); glColor3f(1, 0, 0); } static void ParseOptions(int argc, char *argv[]) { int i; for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-fs") == 0) { FragProgFile = argv[i+1]; } else if (strcmp(argv[i], "-vs") == 0) { VertProgFile = argv[i+1]; } } } 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); ParseOptions(argc, argv); Init(); glutMainLoop(); return 0; }