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import { ObjectType } from 'vtk.js/Sources/Rendering/OpenGL/BufferObject/Constants';
// ----------------------------------------------------------------------------
// vtkOpenGLVertexArrayObject methods
// ----------------------------------------------------------------------------
function vtkOpenGLVertexArrayObject(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkOpenGLVertexArrayObject');
// Public API methods
publicAPI.exposedMethod = () => {
// This is a publicly exposed method of this object
};
publicAPI.initialize = () => {
model.instancingExtension = null;
Iif (!model._openGLRenderWindow.getWebgl2()) {
model.instancingExtension = model.context.getExtension(
'ANGLE_instanced_arrays'
);
}
if (
!model.forceEmulation &&
model._openGLRenderWindow &&
model._openGLRenderWindow.getWebgl2()
) {
model.extension = null;
model.supported = true;
model.handleVAO = model.context.createVertexArray();
} else E{
model.extension = model.context.getExtension('OES_vertex_array_object');
// Start setting up VAO
if (!model.forceEmulation && model.extension) {
model.supported = true;
model.handleVAO = model.extension.createVertexArrayOES();
} else {
model.supported = false;
}
}
};
publicAPI.isReady = () =>
// We either probed and allocated a VAO, or are falling back as the current
// hardware does not support VAOs.
model.handleVAO !== 0 || model.supported === false;
publicAPI.bind = () => {
// Either simply bind the VAO, or emulate behavior by binding all attributes.
if (!publicAPI.isReady()) {
publicAPI.initialize();
}
if (publicAPI.isReady() && model.supported) {
Iif (model.extension) {
model.extension.bindVertexArrayOES(model.handleVAO);
} else {
model.context.bindVertexArray(model.handleVAO);
}
} else Eif (publicAPI.isReady()) {
const gl = model.context;
for (let ibuff = 0; ibuff < model.buffers.length; ++ibuff) {
const buff = model.buffers[ibuff];
model.context.bindBuffer(gl.ARRAY_BUFFER, buff.buffer);
for (let iatt = 0; iatt < buff.attributes.length; ++iatt) {
const attrIt = buff.attributes[iatt];
const matrixCount = attrIt.isMatrix ? attrIt.size : 1;
for (let i = 0; i < matrixCount; ++i) {
gl.enableVertexAttribArray(attrIt.index + i);
gl.vertexAttribPointer(
attrIt.index + i,
attrIt.size,
attrIt.type,
attrIt.normalize,
attrIt.stride,
attrIt.offset + (attrIt.stride * i) / attrIt.size
);
if (attrIt.divisor > 0) {
if (model.instancingExtension) {
model.instancingExtension.vertexAttribDivisorANGLE(
attrIt.index + i,
1
);
} else {
gl.vertexAttribDivisor(attrIt.index + i, 1);
}
}
}
}
}
}
};
publicAPI.release = () => {
// Either simply release the VAO, or emulate behavior by releasing all attributes.
if (publicAPI.isReady() && model.supported) {
Iif (model.extension) {
model.extension.bindVertexArrayOES(null);
} else {
model.context.bindVertexArray(null);
}
} else Iif (publicAPI.isReady()) {
const gl = model.context;
for (let ibuff = 0; ibuff < model.buffers.length; ++ibuff) {
const buff = model.buffers[ibuff];
model.context.bindBuffer(gl.ARRAY_BUFFER, buff.buffer);
for (let iatt = 0; iatt < buff.attributes.length; ++iatt) {
const attrIt = buff.attributes[iatt];
const matrixCount = attrIt.isMatrix ? attrIt.size : 1;
for (let i = 0; i < matrixCount; ++i) {
gl.enableVertexAttribArray(attrIt.index + i);
gl.vertexAttribPointer(
attrIt.index + i,
attrIt.size,
attrIt.type,
attrIt.normalize,
attrIt.stride,
attrIt.offset + (attrIt.stride * i) / attrIt.size
);
if (attrIt.divisor > 0) {
if (model.instancingExtension) {
model.instancingExtension.vertexAttribDivisorANGLE(
attrIt.index + i,
0
);
} else {
gl.vertexAttribDivisor(attrIt.index + i, 0);
}
}
gl.disableVertexAttribArray(attrIt.index + i);
}
}
}
}
};
publicAPI.shaderProgramChanged = () => {
publicAPI.release();
if (model.handleVAO) {
Iif (model.extension) {
model.extension.deleteVertexArrayOES(model.handleVAO);
} else {
model.context.deleteVertexArray(model.handleVAO);
}
}
model.handleVAO = 0;
model.handleProgram = 0;
};
publicAPI.releaseGraphicsResources = () => {
publicAPI.shaderProgramChanged();
Iif (model.handleVAO) {
if (model.extension) {
model.extension.deleteVertexArrayOES(model.handleVAO);
} else {
model.context.deleteVertexArray(model.handleVAO);
}
}
model.handleVAO = 0;
model.supported = true;
model.handleProgram = 0;
};
publicAPI.addAttributeArray = (
program,
buffer,
name,
offset,
stride,
elementType,
elementTupleSize,
normalize
) =>
publicAPI.addAttributeArrayWithDivisor(
program,
buffer,
name,
offset,
stride,
elementType,
elementTupleSize,
normalize,
0,
false
);
publicAPI.addAttributeArrayWithDivisor = (
program,
buffer,
name,
offset,
stride,
elementType,
elementTupleSize,
normalize,
divisor,
isMatrix
) => {
Iif (!program) {
return false;
}
// Check the program is bound, and the buffer is valid.
Iif (
!program.isBound() ||
buffer.getHandle() === 0 ||
buffer.getType() !== ObjectType.ARRAY_BUFFER
) {
return false;
}
// Perform initialization if necessary, ensure program matches VAOs.
if (model.handleProgram === 0) {
model.handleProgram = program.getHandle();
}
Iif (!publicAPI.isReady()) {
publicAPI.initialize();
}
Iif (!publicAPI.isReady() || model.handleProgram !== program.getHandle()) {
return false;
}
const gl = model.context;
const attribs = {};
attribs.name = name;
attribs.index = gl.getAttribLocation(model.handleProgram, name);
attribs.offset = offset;
attribs.stride = stride;
attribs.type = elementType;
attribs.size = elementTupleSize;
attribs.normalize = normalize;
attribs.isMatrix = isMatrix;
attribs.divisor = divisor;
Iif (attribs.Index === -1) {
return false;
}
// Always make the call as even the first use wants the attrib pointer setting
// up when we are emulating.
buffer.bind();
gl.enableVertexAttribArray(attribs.index);
gl.vertexAttribPointer(
attribs.index,
attribs.size,
attribs.type,
attribs.normalize,
attribs.stride,
attribs.offset
);
if (divisor > 0) {
Iif (model.instancingExtension) {
model.instancingExtension.vertexAttribDivisorANGLE(attribs.index, 1);
} else {
gl.vertexAttribDivisor(attribs.index, 1);
}
}
attribs.buffer = buffer.getHandle();
// If vertex array objects are not supported then build up our list.
Iif (!model.supported) {
// find the buffer
let buffFound = false;
for (let ibuff = 0; ibuff < model.buffers.length; ++ibuff) {
const buff = model.buffers[ibuff];
if (buff.buffer === attribs.buffer) {
buffFound = true;
let found = false;
for (let iatt = 0; iatt < buff.attributes.length; ++iatt) {
const attrIt = buff.attributes[iatt];
if (attrIt.name === name) {
found = true;
buff.attributes[iatt] = attribs;
}
}
if (!found) {
buff.attributes.push(attribs);
}
}
}
if (!buffFound) {
model.buffers.push({ buffer: attribs.buffer, attributes: [attribs] });
}
}
return true;
};
publicAPI.addAttributeMatrixWithDivisor = (
program,
buffer,
name,
offset,
stride,
elementType,
elementTupleSize,
normalize,
divisor
) => {
// bind the first row of values
const result = publicAPI.addAttributeArrayWithDivisor(
program,
buffer,
name,
offset,
stride,
elementType,
elementTupleSize,
normalize,
divisor,
true
);
Iif (!result) {
return result;
}
const gl = model.context;
const index = gl.getAttribLocation(model.handleProgram, name);
for (let i = 1; i < elementTupleSize; i++) {
gl.enableVertexAttribArray(index + i);
gl.vertexAttribPointer(
index + i,
elementTupleSize,
elementType,
normalize,
stride,
offset + (stride * i) / elementTupleSize
);
if (divisor > 0) {
Iif (model.instancingExtension) {
model.instancingExtension.vertexAttribDivisorANGLE(index + i, 1);
} else {
gl.vertexAttribDivisor(index + i, 1);
}
}
}
return true;
};
publicAPI.removeAttributeArray = (name) => {
Iif (!publicAPI.isReady() || model.handleProgram === 0) {
return false;
}
// If we don't have real VAOs find the entry and remove it too.
Iif (!model.supported) {
for (let ibuff = 0; ibuff < model.buffers.length; ++ibuff) {
const buff = model.buffers[ibuff];
for (let iatt = 0; iatt < buff.attributes.length; ++iatt) {
const attrIt = buff.attributes[iatt];
if (attrIt.name === name) {
buff.attributes.splice(iatt, 1);
if (!buff.attributes.length) {
model.buffers.splice(ibuff, 1);
}
return true;
}
}
}
}
return true;
};
publicAPI.setOpenGLRenderWindow = (rw) => {
if (model._openGLRenderWindow === rw) {
return;
}
publicAPI.releaseGraphicsResources();
model._openGLRenderWindow = rw;
model.context = null;
if (rw) {
model.context = model._openGLRenderWindow.getContext();
}
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
forceEmulation: false,
handleVAO: 0,
handleProgram: 0,
supported: true,
buffers: null,
context: null,
// _openGLRenderWindow: null,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Internal objects initialization
model.buffers = [];
// Object methods
macro.obj(publicAPI, model);
// Create get-only macros
macro.get(publicAPI, model, ['supported']);
// Create get-set macros
macro.setGet(publicAPI, model, ['forceEmulation']);
// For more macro methods, see "Sources/macros.js"
// Object specific methods
vtkOpenGLVertexArrayObject(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(
extend,
'vtkOpenGLVertexArrayObject'
);
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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