2 * "Toy Ball" shader demo. Uses the example shaders from
3 * chapter 11 of the OpenGL Shading Language "orange" book.
16 #include "shaderutil.h"
19 static char *FragProgFile = "CH11-toyball.frag";
20 static char *VertProgFile = "CH11-toyball.vert";
22 /* program/shader objects */
23 static GLuint fragShader;
24 static GLuint vertShader;
25 static GLuint program;
28 static struct uniform_info Uniforms[] = {
29 { "LightDir", 4, GL_FLOAT, { 0.57737, 0.57735, 0.57735, 0.0 }, -1 },
30 { "HVector", 4, GL_FLOAT, { 0.32506, 0.32506, 0.88808, 0.0 }, -1 },
31 { "BallCenter", 4, GL_FLOAT, { 0.0, 0.0, 0.0, 1.0 }, -1 },
32 { "SpecularColor", 4, GL_FLOAT, { 0.4, 0.4, 0.4, 60.0 }, -1 },
33 { "Red", 4, GL_FLOAT, { 0.6, 0.0, 0.0, 1.0 }, -1 },
34 { "Blue", 4, GL_FLOAT, { 0.0, 0.3, 0.6, 1.0 }, -1 },
35 { "Yellow", 4, GL_FLOAT, { 0.6, 0.5, 0.0, 1.0 }, -1 },
36 { "HalfSpace0", 4, GL_FLOAT, { 1.0, 0.0, 0.0, 0.2 }, -1 },
37 { "HalfSpace1", 4, GL_FLOAT, { 0.309016994, 0.951056516, 0.0, 0.2 }, -1 },
38 { "HalfSpace2", 4, GL_FLOAT, { -0.809016994, 0.587785252, 0.0, 0.2 }, -1 },
39 { "HalfSpace3", 4, GL_FLOAT, { -0.809016994, -0.587785252, 0.0, 0.2 }, -1 },
40 { "HalfSpace4", 4, GL_FLOAT, { 0.309116994, -0.951056516, 0.0, 0.2 }, -1 },
41 { "InOrOutInit", 1, GL_FLOAT, { -3.0, 0, 0, 0 }, -1 },
42 { "StripeWidth", 1, GL_FLOAT, { 0.3, 0, 0, 0 }, -1 },
43 { "FWidth", 1, GL_FLOAT, { 0.005, 0, 0, 0 }, -1 },
48 static GLboolean Anim = GL_FALSE;
49 static GLfloat TexRot = 0.0;
50 static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f;
66 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
69 glRotatef(xRot, 1.0f, 0.0f, 0.0f);
70 glRotatef(yRot, 0.0f, 1.0f, 0.0f);
71 glRotatef(zRot, 0.0f, 0.0f, 1.0f);
73 glMatrixMode(GL_TEXTURE);
75 glRotatef(TexRot, 0.0f, 1.0f, 0.0f);
76 glMatrixMode(GL_MODELVIEW);
78 glutSolidSphere(2.0, 20, 10);
87 Reshape(int width, int height)
89 glViewport(0, 0, width, height);
90 glMatrixMode(GL_PROJECTION);
92 glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
93 glMatrixMode(GL_MODELVIEW);
95 glTranslatef(0.0f, 0.0f, -15.0f);
102 glDeleteShader_func(fragShader);
103 glDeleteShader_func(vertShader);
104 glDeleteProgram_func(program);
105 glutDestroyWindow(win);
110 Key(unsigned char key, int x, int y)
112 const GLfloat step = 2.0;
140 SpecialKey(int key, int x, int y)
142 const GLfloat step = 2.0;
169 if (!ShadersSupported())
174 vertShader = CompileShaderFile(GL_VERTEX_SHADER, VertProgFile);
175 fragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragProgFile);
176 program = LinkShaders(vertShader, fragShader);
178 glUseProgram_func(program);
180 InitUniforms(program, Uniforms);
182 assert(glGetError() == 0);
184 glClearColor(0.4f, 0.4f, 0.8f, 0.0f);
186 glEnable(GL_DEPTH_TEST);
193 ParseOptions(int argc, char *argv[])
196 for (i = 1; i < argc; i++) {
197 if (strcmp(argv[i], "-fs") == 0) {
198 FragProgFile = argv[i+1];
200 else if (strcmp(argv[i], "-vs") == 0) {
201 VertProgFile = argv[i+1];
208 main(int argc, char *argv[])
210 glutInit(&argc, argv);
211 glutInitWindowPosition( 0, 0);
212 glutInitWindowSize(400, 400);
213 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
214 win = glutCreateWindow(argv[0]);
215 glutReshapeFunc(Reshape);
216 glutKeyboardFunc(Key);
217 glutSpecialFunc(SpecialKey);
218 glutDisplayFunc(Redisplay);
219 ParseOptions(argc, argv);