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Add option to attach a stencil buffer to textures. #14

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Add option to attach a stencil buffer to textures. #14

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9 changes: 6 additions & 3 deletions src/texture.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,7 @@
// The arguments `width` and `height` give the size of the texture in texels.
// WebGL texture dimensions must be powers of two unless `filter` is set to
// either `gl.NEAREST` or `gl.LINEAR` and `wrap` is set to `gl.CLAMP_TO_EDGE`
// (which they are by default).
// (which they are by default). A stencil buffer will be attached if stencil set to true
//
// Texture parameters can be passed in via the `options` argument.
// Example usage:
Expand All @@ -21,6 +21,7 @@
//
// format: gl.RGB, // Defaults to gl.RGBA
// type: gl.FLOAT // Defaults to gl.UNSIGNED_BYTE
// stencil: true // Defaults to false
// });
function Texture(width, height, options) {
options = options || {};
Expand All @@ -29,6 +30,8 @@ function Texture(width, height, options) {
this.height = height;
this.format = options.format || gl.RGBA;
this.type = options.type || gl.UNSIGNED_BYTE;
this.internalFormat = options.stencil ? gl.DEPTH_STENCIL : gl.DEPTH_COMPONENT16;
this.attachment = options.stencil ? gl.DEPTH_STENCIL_ATTACHMENT : gl.DEPTH_ATTACHMENT;
gl.bindTexture(gl.TEXTURE_2D, this.id);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, 1);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, options.filter || options.magFilter || gl.LINEAR);
Expand Down Expand Up @@ -81,10 +84,10 @@ Texture.prototype = {
if (this.width != renderbuffer.width || this.height != renderbuffer.height) {
renderbuffer.width = this.width;
renderbuffer.height = this.height;
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, this.width, this.height);
gl.renderbufferStorage(gl.RENDERBUFFER, this.internalFormat, this.width, this.height);
}
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, this.id, 0);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, renderbuffer);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, this.attachment, gl.RENDERBUFFER, renderbuffer);
gl.viewport(0, 0, this.width, this.height);

callback();
Expand Down