void
sceneInit(void)
{
GLint result;
/* create program object and attach shaders */
g_program = glCreateProgram();
shaderAttachFromFile(g_program, GL_VERTEX_SHADER, "data/shader.vp");
shaderAttachFromFile(g_program, GL_FRAGMENT_SHADER, "data/shader.fp");
/* link the program and make sure that there were no errors */
glLinkProgram(g_program);
glGetProgramiv(g_program, GL_LINK_STATUS, &result);
if(result == GL_FALSE) {
GLint length;
char *log;
/* get the program info log */
glGetProgramiv(g_program, GL_INFO_LOG_LENGTH, &length);
log = malloc(length);
glGetProgramInfoLog(g_program, length, &result, log);
/* print an error message and the info log */
fprintf(stderr, "sceneInit(): Program linking failed: %s\n", log);
free(log);
/* delete the program */
glDeleteProgram(g_program);
g_program = 0;
}
/* get uniform locations */
g_programCameraPositionLocation = glGetUniformLocation(g_program, "cameraPosition");
g_programLightPositionLocation = glGetUniformLocation(g_program, "lightPosition");
g_programLightColorLocation = glGetUniformLocation(g_program, "lightColor");
/* set up red/green/blue lights */
g_lightColor[0] = 1.0f; g_lightColor[1] = 0.0f; g_lightColor[2] = 0.0f;
g_lightColor[3] = 0.0f; g_lightColor[4] = 1.0f; g_lightColor[5] = 0.0f;
g_lightColor[6] = 0.0f; g_lightColor[7] = 0.0f; g_lightColor[8] = 1.0f;
/* create cylinder */
createCylinder(36);
/* do the first cycle to initialize positions */
g_lightRotation = 0.0f;
sceneCycle();
/* setup camera */
g_cameraPosition[0] = 0.0f;
g_cameraPosition[1] = 0.0f;
g_cameraPosition[2] = 4.0f;
glLoadIdentity();
glTranslatef(-g_cameraPosition[0], -g_cameraPosition[1], -g_cameraPosition[2]);
}
// Initializes OpenGL. Loads the vertex and fragment shaders, and creates the
// sphere mesh.
void glInit(void)
{
glClearColor (0.0, 0.0, 0.0, 0.0);
// Enable texture for the text fields.
glEnable(GL_TEXTURE_2D);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glFrontFace(GL_CW);
g_program = glCreateProgram();
shaderAttachFromFile(g_program, GL_VERTEX_SHADER, "data/vertex.vp");
shaderAttachFromFile(g_program, GL_FRAGMENT_SHADER, "data/fragment.fp");
GLint result;
glLinkProgram(g_program);
glGetProgramiv(g_program, GL_LINK_STATUS, &result);
if(result == GL_FALSE) {
GLint length;
char *log;
// get the program info log
glGetProgramiv(g_program, GL_INFO_LOG_LENGTH, &length);
log = (char *)malloc(length);
glGetProgramInfoLog(g_program, length, &result, log);
// print an error message and the info log
fprintf(stderr, "init(): Program linking failed: %s\n", log);
free(log);
// delete the program
glDeleteProgram(g_program);
g_program = 0;
}
// get uniform locations
g_programCameraPositionLocation = glGetUniformLocation(g_program, "cameraPosition");
g_programObjectPositionLocation = glGetUniformLocation(g_program, "objectPositions");
g_programLightDirectionLocation = glGetUniformLocation(g_program, "lightDirection");
g_programUserSphereLocation = glGetUniformLocation(g_program, "userSphere");
g_lightDirection[0] = 1.0f;
g_lightDirection[1] = 0.0f;
g_lightDirection[2] = 0.0f;
g_cameraPosition[0] = 0.0f;
g_cameraPosition[1] = 0.0f;
g_cameraPosition[2] = -zoom;
sphereMesh = createSphere(12, 12);
}
