46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
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function compileShader(gl, kind, source) {
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let shader = gl.createShader(kind);
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gl.shaderSource(shader, source);
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gl.compileShader(shader);
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if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
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let error = new Error(`failed to compile shader: ${gl.getShaderInfoLog(shader)}`);
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gl.deleteShader(shader);
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throw error;
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} else {
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return shader;
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}
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}
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export function compileProgram(gl, vertexSource, fragmentSource) {
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let vertexShader = compileShader(gl, gl.VERTEX_SHADER, vertexSource);
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let fragmentShader = compileShader(gl, gl.FRAGMENT_SHADER, fragmentSource);
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let program = gl.createProgram();
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gl.attachShader(program, vertexShader);
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gl.attachShader(program, fragmentShader);
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gl.linkProgram(program);
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gl.deleteShader(vertexShader);
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gl.deleteShader(fragmentShader);
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if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
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let error = new Error(`failed to link program: ${gl.getProgramInfoLog(program)}`);
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gl.deleteProgram(program);
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throw error;
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} else {
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return program;
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}
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}
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export function orthographicProjection(left, right, top, bottom, near, far) {
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// prettier-ignore
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return [
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2 / (right - left), 0, 0, -((right + left) / (right - left)),
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0, 2 / (top - bottom), 0, -((top + bottom) / (top - bottom)),
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0, 0, -2 / (far - near), -((far + near) / (far - near)),
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0, 0, 0, 1,
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];
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}
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