void VertexLayout::enable(ShaderProgram& _program, size_t _byteOffset, void* _ptr) {
GLuint glProgram = _program.getGlProgram();
// Enable all attributes for this layout
for (auto& attrib : m_attribs) {
GLint location = _program.getAttribLocation(attrib.name);
if (location != -1) {
auto& loc = s_enabledAttribs[location];
// Track currently enabled attribs by the program to which they are bound
if (loc != glProgram) {
glEnableVertexAttribArray(location);
loc = glProgram;
}
void* data = _ptr ? _ptr : ((unsigned char*) attrib.offset) + _byteOffset;
glVertexAttribPointer(location, attrib.size, attrib.type, attrib.normalized, m_stride, data);
}
}
// Disable previously bound and now-unneeded attributes
for (auto& locationProgramPair : s_enabledAttribs) {
const GLint& location = locationProgramPair.first;
GLuint& boundProgram = locationProgramPair.second;
if (boundProgram != glProgram && boundProgram != 0) {
glDisableVertexAttribArray(location);
boundProgram = 0;
}
}
}
void VertexLayout::enable(RenderState& rs, ShaderProgram& _program, size_t _byteOffset, void* _ptr) {
GLuint glProgram = _program.getGlProgram();
// Enable all attributes for this layout
for (auto& attrib : m_attribs) {
GLint location = _program.getAttribLocation(attrib.name);
if (location != -1) {
auto& loc = rs.attributeBindings[location];
// Track currently enabled attribs by the program to which they are bound
if (loc != glProgram) {
GL::enableVertexAttribArray(location);
loc = glProgram;
}
void* data = (unsigned char*)_ptr + attrib.offset + _byteOffset;
GL::vertexAttribPointer(location, attrib.size, attrib.type, attrib.normalized, m_stride, data);
}
}
// Disable previously bound and now-unneeded attributes
for (size_t i = 0; i < RenderState::MAX_ATTRIBUTES; ++i) {
GLuint& boundProgram = rs.attributeBindings[i];
if (boundProgram != glProgram && boundProgram != 0) {
GL::disableVertexAttribArray(i);
boundProgram = 0;
}
}
}