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import macro from 'vtk.js/Sources/macros';
import vtkShaderProgram from 'vtk.js/Sources/Rendering/OpenGL/ShaderProgram';
// ----------------------------------------------------------------------------
const SET_GET_FIELDS = [
'lastShaderProgramBound',
'context',
'_openGLRenderWindow',
];
// ----------------------------------------------------------------------------
// vtkShaderCache methods
// ----------------------------------------------------------------------------
function vtkShaderCache(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkShaderCache');
publicAPI.replaceShaderValues = (VSSource, FSSource, GSSource) => {
// first handle renaming any Fragment shader inputs
// if we have a geometry shader. By default fragment shaders
// assume their inputs come from a Vertex Shader. When we
// have a Geometry shader we rename the frament shader inputs
// to come from the geometry shader
let nFSSource = FSSource;
Iif (GSSource.length > 0) {
nFSSource = vtkShaderProgram.substitute(
nFSSource,
'VSOut',
'GSOut'
).result;
}
const gl2 = model._openGLRenderWindow.getWebgl2();
let fragDepthString = '\n';
let version = '#version 100\n';
if (gl2) {
version =
'#version 300 es\n' +
'#define attribute in\n' +
'#define textureCube texture\n' +
'#define texture2D texture\n' +
'#define textureCubeLod textureLod\n' +
'#define texture2DLod textureLod\n';
} else E{
model.context.getExtension('OES_standard_derivatives');
if (model.context.getExtension('EXT_frag_depth')) {
fragDepthString = '#extension GL_EXT_frag_depth : enable\n';
}
if (model.context.getExtension('EXT_shader_texture_lod')) {
fragDepthString +=
'#extension GL_EXT_shader_texture_lod : enable\n' +
'#define textureCubeLod textureCubeLodEXT\n' +
'#define texture2DLod texture2DLodEXT';
}
}
nFSSource = vtkShaderProgram.substitute(nFSSource, '//VTK::System::Dec', [
`${version}\n`,
gl2 ? '' : '#extension GL_OES_standard_derivatives : enable\n',
fragDepthString,
'#ifdef GL_FRAGMENT_PRECISION_HIGH',
'precision highp float;',
'precision highp int;',
'#else',
'precision mediump float;',
'precision mediump int;',
'#endif',
]).result;
let nVSSource = vtkShaderProgram.substitute(
VSSource,
'//VTK::System::Dec',
[
`${version}\n`,
'#ifdef GL_FRAGMENT_PRECISION_HIGH',
'precision highp float;',
'precision highp int;',
'#else',
'precision mediump float;',
'precision mediump int;',
'#endif',
]
).result;
if (gl2) {
nVSSource = vtkShaderProgram.substitute(
nVSSource,
'varying',
'out'
).result;
nFSSource = vtkShaderProgram.substitute(
nFSSource,
'varying',
'in'
).result;
let shaderOutputs = '';
let outputCount = 0;
while (nFSSource.includes(`gl_FragData[${outputCount}]`)) {
nFSSource = vtkShaderProgram.substitute(
nFSSource,
`gl_FragData\\[${outputCount}\\]`,
`fragOutput${outputCount}`
).result;
shaderOutputs += `layout(location = ${outputCount}) out vec4 fragOutput${outputCount};\n`;
outputCount++;
}
nFSSource = vtkShaderProgram.substitute(
nFSSource,
'//VTK::Output::Dec',
shaderOutputs
).result;
}
// nFSSource = ShaderProgram.substitute(nFSSource, 'gl_FragData\\[0\\]',
// 'gl_FragColor').result;
const nGSSource = vtkShaderProgram.substitute(
GSSource,
'//VTK::System::Dec',
version
).result;
return { VSSource: nVSSource, FSSource: nFSSource, GSSource: nGSSource };
};
// return NULL if there is an issue
publicAPI.readyShaderProgramArray = (
vertexCode,
fragmentCode,
geometryCode
) => {
const data = publicAPI.replaceShaderValues(
vertexCode,
fragmentCode,
geometryCode
);
const shaderProgram = publicAPI.getShaderProgram(
data.VSSource,
data.FSSource,
data.GSSource
);
return publicAPI.readyShaderProgram(shaderProgram);
};
publicAPI.readyShaderProgram = (program) => {
Iif (!program) {
return null;
}
// compile if needed
Iif (!program.getCompiled() && !program.compileShader()) {
return null;
}
// bind if needed
Iif (!publicAPI.bindShaderProgram(program)) {
return null;
}
return program;
};
publicAPI.getShaderProgram = (vertexCode, fragmentCode, geometryCode) => {
// compute the MD5 and the check the map
const hashInput = `${vertexCode}${fragmentCode}${geometryCode}`;
const result = Md5.hash(hashInput);
// does it already exist?
if (!(result in model.shaderPrograms)) {
// create one
const sps = vtkShaderProgram.newInstance();
sps.setContext(model.context);
sps.getVertexShader().setSource(vertexCode);
sps.getFragmentShader().setSource(fragmentCode);
Iif (geometryCode) {
sps.getGeometryShader().setSource(geometryCode);
}
sps.setMd5Hash(result);
model.shaderPrograms[result] = sps;
return sps;
}
return model.shaderPrograms[result];
};
publicAPI.releaseGraphicsResources = (win) => {
// NOTE:
// In the current implementation as of October 26th, if a shader
// program is created by ShaderCache then it should make sure
// that it releases the graphics resources used by these programs.
// It is not wisely for callers to do that since then they would
// have to loop over all the programs were in use and invoke
// release graphics resources individually.
publicAPI.releaseCurrentShaderProgram();
Object.keys(model.shaderPrograms)
.map((key) => model.shaderPrograms[key])
.forEach((sp) => sp.cleanup());
model.shaderPrograms = {};
};
publicAPI.releaseCurrentShaderProgram = () => {
// release prior shader
if (model.lastShaderProgramBound) {
model.lastShaderProgramBound.cleanup();
model.lastShaderProgramBound = null;
}
};
publicAPI.bindShaderProgram = (program) => {
if (model.lastShaderProgramBound === program) {
return 1;
}
// release prior program
if (model.lastShaderProgramBound) {
model.lastShaderProgramBound.release();
}
program.bind();
model.lastShaderProgramBound = program;
return 1;
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
lastShaderProgramBound: null,
shaderPrograms: null,
context: null,
// _openGLRenderWindow: null,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Internal objects
model.shaderPrograms = {};
// Build VTK API
macro.obj(publicAPI, model);
macro.setGet(publicAPI, model, SET_GET_FIELDS);
macro.moveToProtected(publicAPI, model, ['openGLRenderWindow']);
// Object methods
vtkShaderCache(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkShaderCache');
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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