title | slug | page-type | browser-compat |
---|---|---|---|
WebGLShader |
Web/API/WebGLShader |
web-api-interface |
api.WebGLShader |
{{APIRef("WebGL")}}
The WebGLShader is part of the WebGL API and can either be a vertex or a fragment shader. A {{domxref("WebGLProgram")}} requires both types of shaders.
{{InheritanceDiagram}}
To create a WebGLShader use {{domxref("WebGLRenderingContext.createShader")}}, then hook up the GLSL source code using {{domxref("WebGLRenderingContext.shaderSource()")}}, and finally invoke {{domxref("WebGLRenderingContext.compileShader()")}} to finish and compile the shader. At this point the WebGLShader is still not in a usable form and must still be attached to a {{domxref("WebGLProgram")}}.
function createShader(gl, sourceCode, type) {
// Compiles either a shader of type gl.VERTEX_SHADER or gl.FRAGMENT_SHADER
const shader = gl.createShader(type);
gl.shaderSource(shader, sourceCode);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
const info = gl.getShaderInfoLog(shader);
throw `Could not compile WebGL program. \n\n${info}`;
}
return shader;
}
See {{domxref("WebGLProgram")}} for information on attaching the shaders.
Note that there are many other strategies for writing and accessing shader source code strings. These example are for illustration purposes only.
const vertexShaderSource =
"attribute vec4 position;\n" +
"void main() {\n" +
" gl_Position = position;\n" +
"}\n";
//Use the createShader function from the example above
const vertexShader = createShader(gl, vertexShaderSource, gl.VERTEX_SHADER);
const fragmentShaderSource =
"void main() {\n" + " gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);\n" + "}\n";
//Use the createShader function from the example above
const fragmentShader = createShader(
gl,
fragmentShaderSource,
gl.FRAGMENT_SHADER,
);
{{Specifications}}
{{Compat}}
- {{domxref("WebGLProgram")}}
- {{domxref("WebGLRenderingContext.attachShader()")}}
- {{domxref("WebGLRenderingContext.bindAttribLocation()")}}
- {{domxref("WebGLRenderingContext.compileShader()")}}
- {{domxref("WebGLRenderingContext.createProgram()")}}
- {{domxref("WebGLRenderingContext.createShader()")}}
- {{domxref("WebGLRenderingContext.deleteProgram()")}}
- {{domxref("WebGLRenderingContext.deleteShader()")}}
- {{domxref("WebGLRenderingContext.detachShader()")}}
- {{domxref("WebGLRenderingContext.getAttachedShaders()")}}
- {{domxref("WebGLRenderingContext.getProgramParameter()")}}
- {{domxref("WebGLRenderingContext.getProgramInfoLog()")}}
- {{domxref("WebGLRenderingContext.getShaderParameter()")}}
- {{domxref("WebGLRenderingContext.getShaderPrecisionFormat()")}}
- {{domxref("WebGLRenderingContext.getShaderInfoLog()")}}
- {{domxref("WebGLRenderingContext.getShaderSource()")}}
- {{domxref("WebGLRenderingContext.isProgram()")}}
- {{domxref("WebGLRenderingContext.isShader()")}}
- {{domxref("WebGLRenderingContext.linkProgram()")}}
- {{domxref("WebGLRenderingContext.shaderSource()")}}
- {{domxref("WebGLRenderingContext.useProgram()")}}
- {{domxref("WebGLRenderingContext.validateProgram()")}}