mirror of
https://github.com/DanielnetoDotCom/YouPHPTube
synced 2025-10-03 01:39:24 +02:00
105 lines
3.2 KiB
JavaScript
105 lines
3.2 KiB
JavaScript
function WGLUPreserveGLState(gl, bindings, callback) {
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if (!bindings) {
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callback(gl);
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return;
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}
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var boundValues = [];
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var activeTexture = null;
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for (var i = 0; i < bindings.length; ++i) {
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var binding = bindings[i];
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switch (binding) {
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case gl.TEXTURE_BINDING_2D:
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case gl.TEXTURE_BINDING_CUBE_MAP:
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var textureUnit = bindings[++i];
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if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31) {
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console.error("TEXTURE_BINDING_2D or TEXTURE_BINDING_CUBE_MAP must be followed by a valid texture unit");
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boundValues.push(null, null);
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break;
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}
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if (!activeTexture) {
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activeTexture = gl.getParameter(gl.ACTIVE_TEXTURE);
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}
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gl.activeTexture(textureUnit);
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boundValues.push(gl.getParameter(binding), null);
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break;
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case gl.ACTIVE_TEXTURE:
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activeTexture = gl.getParameter(gl.ACTIVE_TEXTURE);
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boundValues.push(null);
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break;
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default:
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boundValues.push(gl.getParameter(binding));
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break;
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}
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}
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callback(gl);
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for (var i = 0; i < bindings.length; ++i) {
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var binding = bindings[i];
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var boundValue = boundValues[i];
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switch (binding) {
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case gl.ACTIVE_TEXTURE:
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break; // Ignore this binding, since we special-case it to happen last.
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case gl.ARRAY_BUFFER_BINDING:
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gl.bindBuffer(gl.ARRAY_BUFFER, boundValue);
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break;
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case gl.COLOR_CLEAR_VALUE:
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gl.clearColor(boundValue[0], boundValue[1], boundValue[2], boundValue[3]);
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break;
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case gl.COLOR_WRITEMASK:
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gl.colorMask(boundValue[0], boundValue[1], boundValue[2], boundValue[3]);
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break;
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case gl.CURRENT_PROGRAM:
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gl.useProgram(boundValue);
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break;
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case gl.ELEMENT_ARRAY_BUFFER_BINDING:
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, boundValue);
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break;
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case gl.FRAMEBUFFER_BINDING:
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gl.bindFramebuffer(gl.FRAMEBUFFER, boundValue);
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break;
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case gl.RENDERBUFFER_BINDING:
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gl.bindRenderbuffer(gl.RENDERBUFFER, boundValue);
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break;
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case gl.TEXTURE_BINDING_2D:
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var textureUnit = bindings[++i];
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if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31)
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break;
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gl.activeTexture(textureUnit);
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gl.bindTexture(gl.TEXTURE_2D, boundValue);
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break;
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case gl.TEXTURE_BINDING_CUBE_MAP:
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var textureUnit = bindings[++i];
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if (textureUnit < gl.TEXTURE0 || textureUnit > gl.TEXTURE31)
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break;
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gl.activeTexture(textureUnit);
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gl.bindTexture(gl.TEXTURE_CUBE_MAP, boundValue);
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break;
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case gl.VIEWPORT:
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gl.viewport(boundValue[0], boundValue[1], boundValue[2], boundValue[3]);
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break;
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case gl.BLEND:
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case gl.CULL_FACE:
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case gl.DEPTH_TEST:
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case gl.SCISSOR_TEST:
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case gl.STENCIL_TEST:
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if (boundValue) {
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gl.enable(binding);
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} else {
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gl.disable(binding);
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}
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break;
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default:
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console.log("No GL restore behavior for 0x" + binding.toString(16));
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break;
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}
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if (activeTexture) {
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gl.activeTexture(activeTexture);
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}
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}
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}
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module.exports = WGLUPreserveGLState;
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