Pro OpenGL ES for iOS

324 CHAPTER 10: OpenGL ES 2, Shaders, and...^

memcpy(&startData->xyz,vtxPtr,xyzSize); //geometry

memcpy(&startData->nxyz,norPtr,nxyzSize); //normals

memcpy(&startData->rgba,colPtr,rgbaSize); //colors

memcpy(&startData->st,textPtr,textSize); //texture coords

startData++;

vtxPtr+=NUM_XYZ_ELS;

norPtr+=NUM_NXYZ_ELS;

colPtr+=NUM_RGBA_ELS;

textPtr+=NUM_ST_ELS;

}

}

-(void)createVAO

{

GLuint numBytesPerXYZ,numBytesPerNXYZ,numBytesPerRGBA;

GLuint structSize=sizeof(struct VAOInterleaved);

[self createInterleavedData];

//note that the context is set in the in the parent object

glGenVertexArraysOES(1, &m_VertexArrayName);

glBindVertexArrayOES(m_VertexArrayName);

numBytesPerXYZ=sizeof(GL_FLOAT)*NUM_XYZ_ELS;

numBytesPerNXYZ=sizeof(GL_FLOAT)*NUM_NXYZ_ELS;

numBytesPerRGBA=sizeof(GL_FLOAT)*NUM_RGBA_ELS;

glGenBuffers(1, &m_VertexBufferName);

glBindBuffer(GL_ARRAY_BUFFER, m_VertexBufferName);

glBufferData(GL_ARRAY_BUFFER, sizeof(struct VAOInterleaved)*m_NumVertices,

m_InterleavedData, GL_STATIC_DRAW);

glEnableVertexAttribArray(GLKVertexAttribNormal);

glVertexAttribPointer(GLKVertexAttribNormal, NUM_NXYZ_ELS, GL_FLOAT, GL_FALSE,

structSize, BUFFER_OFFSET(numBytesPerXYZ));

glEnableVertexAttribArray(GLKVertexAttribColor);

glVertexAttribPointer(GLKVertexAttribColor, NUM_RGBA_ELS, GL_FLOAT,

GL_FALSE, structSize, BUFFER_OFFSET(numBytesPerNXYZ+numBytesPerXYZ));

glEnableVertexAttribArray(GLKVertexAttribTexCoord0);

glVertexAttribPointer(GLKVertexAttribTexCoord0,NUM_ST_ELS, GL_FLOAT, GL_FALSE,

structSize,

BUFFER_OFFSET(numBytesPerNXYZ+numBytesPerXYZ+numBytesPerRGBA));

}