Vertex Attributes, Vertex Arrays, and Buffer Objects - Praise for OpenGL ES 30 Programming Guide - page 153

Example 6-7 Drawing with a Vertex Array Object (continued)

// Index buffer data
GLushort indices[3] = { 0, 1, 2 };

// Create the program object
programObject = esLoadProgram ( vShaderStr, fShaderStr );

if ( programObject == 0 )
return GL_FALSE;

// Store the program object
userData->programObject = programObject;

// Generate VBO Ids and load the VBOs with data
glGenBuffers ( 2, userData->vboIds );

glBindBuffer ( GL_ARRAY_BUFFER, userData->vboIds[0] );
glBufferData ( GL_ARRAY_BUFFER, sizeof(vertices),
vertices, GL_STATIC_DRAW);
glBindBuffer ( GL_ELEMENT_ARRAY_BUFFER, userData->vboIds[1]);
glBufferData ( GL_ELEMENT_ARRAY_BUFFER, sizeof ( indices ),
indices, GL_STATIC_DRAW );

// Generate VAO ID
glGenVertexArrays ( 1, &userData->vaoId );

// Bind the VAO and then set up the vertex
// attributes
glBindVertexArray ( userData->vaoId );

glBindBuffer(GL_ARRAY_BUFFER, userData->vboIds[0]);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, userData->vboIds[1]);

glEnableVertexAttribArray(VERTEX_POS_INDX);
glEnableVertexAttribArray(VERTEX_COLOR_INDX);

glVertexAttribPointer ( VERTEX_POS_INDX, VERTEX_POS_SIZE,
GL_FLOAT, GL_FALSE, VERTEX_STRIDE, (const void*) 0 );

glVertexAttribPointer ( VERTEX_COLOR_INDX, VERTEX_COLOR_SIZE,
GL_FLOAT, GL_FALSE, VERTEX_STRIDE,
(const void*) ( VERTEX_POS_SIZE * sizeof(GLfloat) ) );

// Reset to the default VAO
glBindVertexArray ( 0 );

glClearColor ( 0.0f, 0.0f, 0.0f, 0.0f );
return GL_TRUE;
}

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