| /** |
| * "Brick" shader demo. Uses the example shaders from chapter 6 of |
| * the OpenGL Shading Language "orange" book. |
| * 10 Jan 2007 |
| */ |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <math.h> |
| #include <GL/glew.h> |
| #include <GL/glut.h> |
| #include "shaderutil.h" |
| |
| |
| static char *FragProgFile = "CH06-brick.frag"; |
| static char *VertProgFile = "CH06-brick.vert"; |
| |
| /* program/shader objects */ |
| static GLuint fragShader; |
| static GLuint vertShader; |
| static GLuint program; |
| |
| static struct uniform_info Uniforms[] = { |
| /* vert */ |
| { "LightPosition", 1, GL_FLOAT_VEC3, { 0.1, 0.1, 9.0, 0}, -1 }, |
| /* frag */ |
| { "BrickColor", 1, GL_FLOAT_VEC3, { 0.8, 0.2, 0.2, 0 }, -1 }, |
| { "MortarColor", 1, GL_FLOAT_VEC3, { 0.6, 0.6, 0.6, 0 }, -1 }, |
| { "BrickSize", 1, GL_FLOAT_VEC2, { 1.0, 0.3, 0, 0 }, -1 }, |
| { "BrickPct", 1, GL_FLOAT_VEC2, { 0.9, 0.8, 0, 0 }, -1 }, |
| END_OF_UNIFORMS |
| }; |
| |
| static GLint win = 0; |
| |
| |
| static GLfloat xRot = 0.0f, yRot = 0.0f, zRot = 0.0f; |
| |
| |
| |
| |
| 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); |
| |
| 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(fragShader); |
| glDeleteShader(vertShader); |
| glDeleteProgram(program); |
| glutDestroyWindow(win); |
| } |
| |
| |
| static void |
| Key(unsigned char key, int x, int y) |
| { |
| (void) x; |
| (void) y; |
| |
| switch(key) { |
| 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 |
| Init(void) |
| { |
| if (!ShadersSupported()) |
| exit(1); |
| |
| vertShader = CompileShaderFile(GL_VERTEX_SHADER, VertProgFile); |
| fragShader = CompileShaderFile(GL_FRAGMENT_SHADER, FragProgFile); |
| program = LinkShaders(vertShader, fragShader); |
| |
| glUseProgram(program); |
| |
| SetUniformValues(program, Uniforms); |
| PrintUniforms(Uniforms); |
| |
| assert(glGetError() == 0); |
| |
| glClearColor(0.4f, 0.4f, 0.8f, 0.0f); |
| |
| printf("GL_RENDERER = %s\n",(const char *) glGetString(GL_RENDERER)); |
| |
| assert(glIsProgram(program)); |
| assert(glIsShader(fragShader)); |
| assert(glIsShader(vertShader)); |
| |
| 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); |
| glutInitWindowSize(400, 400); |
| glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); |
| win = glutCreateWindow(argv[0]); |
| glewInit(); |
| glutReshapeFunc(Reshape); |
| glutKeyboardFunc(Key); |
| glutSpecialFunc(SpecialKey); |
| glutDisplayFunc(Redisplay); |
| ParseOptions(argc, argv); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |
| |