3D graphics eBook - Course Materials Repository

Vertex Buffer Object 230
GLuint shaderProgram;
/* These pointers will receive the contents of our shader source code
files */
GLchar *vertexSource, *fragmentSource;
/* These are handles used to reference the shaders */
GLuint vertexShader, fragmentShader;
const unsigned int shaderAtribute = 0;
const float NUM_OF_VERTICES_IN_DATA=3;
/* Vertices of a triangle (counter-clockwise winding) */
float data[3][3] = {
};
{ 0.0, 1.0, 0.0 },
{ -1.0, -1.0, 0.0 },
{ 1.0, -1.0, 0.0 }
/*---------------------- Initialise VBO - (Note: do only once, at start
of program) ---------------------*/
/* Create a new VBO and use the variable "triangleVBO" to store the VBO
id */
glGenBuffers(1, &triangleVBO);
/* Make the new VBO active */
glBindBuffer(GL_ARRAY_BUFFER, triangleVBO);
/* Upload vertex data to the video device */
glBufferData(GL_ARRAY_BUFFER, NUM_OF_VERTICES_IN_DATA * 3 *
sizeof(float), data, GL_STATIC_DRAW);
/* Specify that our coordinate data is going into attribute index
0(shaderAtribute), and contains three floats per vertex */
glVertexAttribPointer(shaderAtribute, 3, GL_FLOAT, GL_FALSE, 0, 0);
/* Enable attribute index 0(shaderAtribute) as being used */
glEnableVertexAttribArray(shaderAtribute);
/* Make the new VBO active. */
glBindBuffer(GL_ARRAY_BUFFER, triangleVBO);
/*-------------------------------------------------------------------------------------------------------*/
/*--------------------- Load Vertex and Fragment shaders from files and
compile them --------------------*/