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SummationByParts
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use sampler for texture

This commit is contained in:
Magnus Ulimoen 2019-03-28 20:21:52 +01:00
parent f1018f6874
commit 40eb2d53c9
1 changed files with 61 additions and 19 deletions
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60
main.js
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@ -15,7 +15,7 @@ function main() {
varying lowp vec2 vVertexPosition; varying lowp vec2 vVertexPosition;
void main() { void main() {
vVertexPosition = aVertexPosition; vVertexPosition = (aVertexPosition + 1.0)/2.0;
gl_Position = vec4(aVertexPosition.x, aVertexPosition.y, 0.0, 1.0); gl_Position = vec4(aVertexPosition.x, aVertexPosition.y, 0.0, 1.0);
} }
`; `;
@ -23,11 +23,10 @@ function main() {
const fsSource = ` const fsSource = `
varying lowp vec2 vVertexPosition; varying lowp vec2 vVertexPosition;
uniform sampler2D uSampler;
void main() { void main() {
lowp float x = (vVertexPosition.x + 1.0)/2.0; gl_FragColor = vec4(texture2D(uSampler, vVertexPosition).a, 0.0, 0.0, 1.0);
lowp float y = (vVertexPosition.y + 1.0)/2.0;
gl_FragColor = vec4(x, y, mod(x + y, 0.5), 1.0);
//gl_FragColor = vec4(1.0, 0.0, 1.0, 1.0);
} }
`; `;
@ -62,6 +61,9 @@ function main() {
attribLocations: { attribLocations: {
vertexPosition: gl.getAttribLocation(shaderProgram, 'aVertexPosition'), vertexPosition: gl.getAttribLocation(shaderProgram, 'aVertexPosition'),
}, },
uniformLocation: {
sampler: gl.getUniformLocation(shaderProgram, 'uShader'),
},
}; };
const positionBuffer = gl.createBuffer(); const positionBuffer = gl.createBuffer();
@ -75,13 +77,44 @@ function main() {
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW); gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);
function drawMe() {
gl.clearColor(0.0, 0.0, 0.0, 1.0); const width = 4;
const height = 5;
const field = new Uint8Array(width*height);
for (var i = 0; i < height; i += 1) {
for (var j = 0; j < width; j += 1) {
// Each bin is the same size when +1
// 0.1, 0.9, 1.0, ..., 255.0, 255.9, 256.0
// |------|, ,|-----------|, |--RNG stops here--|
field[i*width + j] = Math.floor(Math.random() * (255 + 1));
}
}
console.log(field);
const texture = gl.createTexture();
{
gl.bindTexture(gl.TEXTURE_2D, texture);
const level = 0;
const internalFormat = gl.ALPHA;
const border = 0;
const srcFormat = gl.ALPHA;
const srcType = gl.UNSIGNED_BYTE;
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat, width, height, border, srcFormat, srcType, field);
}
// GL state functions, must be moved to loop if changing
gl.clearColor(1.0, 0.753, 0.796, 1.0);
gl.clearDepth(1.0); gl.clearDepth(1.0);
gl.enable(gl.DEPTH_TEST); gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL); gl.depthFunc(gl.LEQUAL);
gl.disable(gl.CULL_FACE);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.useProgram(programInfo.program);
{ // Binding vertices { // Binding vertices
const numComponents = 2; const numComponents = 2;
@ -94,7 +127,16 @@ function main() {
gl.enableVertexAttribArray(programInfo.attribLocations.vertexPositions); gl.enableVertexAttribArray(programInfo.attribLocations.vertexPositions);
} }
gl.useProgram(programInfo.program); function drawMe() {
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
{ // Binding uniforms
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.uniform1i(programInfo.uniformLocation.sampler, 0);
}
const offset = 0; const offset = 0;
const vertexCount = 4; const vertexCount = 4;