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backbuffer

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This commit is contained in:
Gyuri Horák 2023-02-18 17:51:52 +01:00
parent 68e54df51b
commit b0d7efe523
Signed by: dyuri
GPG Key ID: 4993F07B3EAE8D38
2 changed files with 138 additions and 32 deletions
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25
demo/index.html
View File

@ -23,18 +23,19 @@
</head> </head>
<body> <body>
<repa-shader fs-input="fsinput" alpha mouse snippets="noise.glsl" width=512 height=512> <repa-shader fs-input="fsinput" alpha mouse snippets="noise.glsl" width=512 height=512>
<script type="x-shader/x-fragmen"> <script type="x-shader/x-fragment">
void main() { void main() {
vec2 uv = gl_FragCoord.xy / resolution.xy; vec2 uv = gl_FragCoord.xy / resolution.xy;
vec3 col = .5 + .5 * cos(uv.xyx + time + vec3(0, 2, 4)); vec3 col = .5 + .5 * cos(uv.xyx + time + vec3(0, 2, 4));
float dist = distance(uv, mouse); float dist = distance(uv, mouse);
float circle = smoothstep(.1, .2, dist) * .5 + .5; float circle = smoothstep(.15, .2, dist);
vec4 acolor = vec4(col * circle, circle); vec4 acolor = vec4(col * (1. - circle), (1. - circle)) + circle * texture(backbuffer, uv - vec2(.01, .01)) * .9;
outColor = vec4(acolor); outColor = vec4(acolor);
} }
</script> </script>
<script type="x-shader/x-fragment"> <script type="x-shader/x-fragmen">
// https://twigl.app/?ol=true&ss=-NOAlYulOVLklxMdxBDx
void main() { void main() {
vec2 n,N,q,p=FC.xy/r.y; vec2 n,N,q,p=FC.xy/r.y;
float S=9.,a,j; float S=9.,a,j;
@ -49,22 +50,6 @@ void main() {
} }
o+=pow(max(o-o,(a+.5)*.1*vec4(6,1,2,0)+.003/length(N)),o-o+.45); o+=pow(max(o-o,(a+.5)*.1*vec4(6,1,2,0)+.003/length(N)),o-o+.45);
} }
</script>
<script type="x-shader/x-fragmen">
precision highp float;
uniform vec2 resolution;
uniform vec2 mouse;
uniform float time;
out vec4 outColor;
void main() {
vec2 uv = gl_FragCoord.xy / resolution.xy;
vec3 col = .5 + .5 * cos(uv.xyx + time + vec3(0, 2, 4));
float dist = distance(uv, mouse);
float circle = smoothstep(.1, .2, dist) * .5 + .5;
vec4 acolor = vec4(col * circle, circle);
outColor = vec4(acolor);
}
</script> </script>
</repa-shader> </repa-shader>
<div> <div>

145
src/repa-shader.js
View File

@ -15,14 +15,16 @@ const CHUNKS = {
#define m mouse #define m mouse
#define t time #define t time
#define f frame #define f frame
#define b backbuffer
#define o outColor #define o outColor
precision highp float; precision highp float;
uniform vec2 resolution; uniform vec2 resolution;
uniform vec2 mouse; uniform vec2 mouse;
uniform float time; uniform float time;
uniform float frame; uniform float frame;
uniform sampler2D backbuffer;
out vec4 outColor; out vec4 outColor;
`, // TODO sampler2D, MRT `, // TODO MRT
geekestStart: ` geekestStart: `
void main() { void main() {
`, `,
@ -74,6 +76,17 @@ class RepaShader extends HTMLElement {
// TODO resize // TODO resize
// postprocessing
this._postProgram = this._gl.createProgram();
const pvs = this._createShader(this._postProgram, this.postVS, true);
const pfs = this._createShader(this._postProgram, this.postFS);
this._gl.linkProgram(this._postProgram);
this._gl.deleteShader(pvs);
this._gl.deleteShader(pfs);
this._postUniLocation = {};
this._postUniLocation.texture = this._gl.getUniformLocation(this._postProgram, 'drawTexture');
this._postAttLocation = this._gl.getAttribLocation(this._postProgram, 'position');
this._gl.bindBuffer(this._gl.ARRAY_BUFFER, this._gl.createBuffer()); this._gl.bindBuffer(this._gl.ARRAY_BUFFER, this._gl.createBuffer());
this._gl.bufferData(this._gl.ARRAY_BUFFER, new Float32Array([-1,1,0,-1,-1,0,1,1,0,1,-1,0]), this._gl.STATIC_DRAW); this._gl.bufferData(this._gl.ARRAY_BUFFER, new Float32Array([-1,1,0,-1,-1,0,1,1,0,1,-1,0]), this._gl.STATIC_DRAW);
this._gl.disable(this._gl.DEPTH_TEST); this._gl.disable(this._gl.DEPTH_TEST);
@ -154,8 +167,74 @@ class RepaShader extends HTMLElement {
this._mousePosition = [x / this._target.width, 1 - y / this._target.height]; this._mousePosition = [x / this._target.width, 1 - y / this._target.height];
} }
_resetBuffer(buff) {
if (!this._gl || !buff) {
return;
}
// framebuffer
if (buff.framebuffer && this._gl.isFramebuffer(buff.framebuffer)) {
this._gl.bindFramebuffer(this._gl.FRAMEBUFFER, null);
this._gl.deleteFramebuffer(buff.framebuffer);
buff.framebuffer = null;
}
// renderbuffer
if (buff.renderbuffer && this._gl.isRenderbuffer(buff.renderbuffer)) {
this._gl.bindRenderbuffer(this._gl.RENDERBUFFER, null);
this._gl.deleteRenderbuffer(buff.renderbuffer);
buff.renderbuffer = null;
}
// texture
if (buff.texture && this._gl.isTexture(buff.texture)) {
this._gl.bindTexture(this._gl.TEXTURE_2D, null);
this._gl.deleteTexture(buff.texture);
buff.texture = null;
}
}
_createBuffer(w, h) {
const buff = {};
// framebuffer
buff.framebuffer = this._gl.createFramebuffer();
this._gl.bindFramebuffer(this._gl.FRAMEBUFFER, buff.framebuffer);
// renderbuffer
buff.renderbuffer = this._gl.createRenderbuffer();
this._gl.bindRenderbuffer(this._gl.RENDERBUFFER, buff.renderbuffer);
this._gl.renderbufferStorage(this._gl.RENDERBUFFER, this._gl.DEPTH_COMPONENT16, w, h);
this._gl.framebufferRenderbuffer(this._gl.FRAMEBUFFER, this._gl.DEPTH_ATTACHMENT, this._gl.RENDERBUFFER, buff.renderbuffer);
// texture
buff.texture = this._gl.createTexture();
this._gl.bindTexture(this._gl.TEXTURE_2D, buff.texture);
this._gl.texImage2D(this._gl.TEXTURE_2D, 0, this._gl.RGBA, w, h, 0, this._gl.RGBA, this._gl.UNSIGNED_BYTE, null);
this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_MIN_FILTER, this._gl.LINEAR);
this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_MAG_FILTER, this._gl.LINEAR);
this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_WRAP_S, this._gl.CLAMP_TO_EDGE);
this._gl.texParameteri(this._gl.TEXTURE_2D, this._gl.TEXTURE_WRAP_T, this._gl.CLAMP_TO_EDGE);
this._gl.framebufferTexture2D(this._gl.FRAMEBUFFER, this._gl.COLOR_ATTACHMENT0, this._gl.TEXTURE_2D, buff.texture, 0);
// unbind
this._gl.bindTexture(this._gl.TEXTURE_2D, null);
this._gl.bindRenderbuffer(this._gl.RENDERBUFFER, null);
this._gl.bindFramebuffer(this._gl.FRAMEBUFFER, null);
return buff;
}
_resetBuffers() {
this._resetBuffer(this.backbuffer);
this._resetBuffer(this.frontbuffer);
}
async reset(time) { async reset(time) {
this._resizeTarget(); this._resizeTarget();
this._resetBuffers();
this.backbuffer = this._createBuffer(this._target.width, this._target.height);
this.frontbuffer = this._createBuffer(this._target.width, this._target.height);
if (this.hasAttribute('mouse')) { if (this.hasAttribute('mouse')) {
this._target.addEventListener('pointermove', this._onMouseMove.bind(this)); this._target.addEventListener('pointermove', this._onMouseMove.bind(this));
@ -186,11 +265,7 @@ class RepaShader extends HTMLElement {
return; return;
} }
const resolution = 'resolution'; // TODO sound? mrt? textures?
const mouse = 'mouse';
const nowTime = 'time';
const frame = 'frame';
// TODO sound? backbuffer? mrt?
if (this._program) { if (this._program) {
this._gl.deleteProgram(this._program); this._gl.deleteProgram(this._program);
@ -198,10 +273,11 @@ class RepaShader extends HTMLElement {
this.program = program; this.program = program;
this._gl.useProgram(this.program); this._gl.useProgram(this.program);
this._uniLocation = {}; this._uniLocation = {};
this._uniLocation.resolution = this._gl.getUniformLocation(this.program, resolution); this._uniLocation.resolution = this._gl.getUniformLocation(this.program, 'resolution');
this._uniLocation.mouse = this._gl.getUniformLocation(this.program, mouse); this._uniLocation.mouse = this._gl.getUniformLocation(this.program, 'mouse');
this._uniLocation.time = this._gl.getUniformLocation(this.program, nowTime); this._uniLocation.time = this._gl.getUniformLocation(this.program, 'time');
this._uniLocation.frame = this._gl.getUniformLocation(this.program, frame); this._uniLocation.frame = this._gl.getUniformLocation(this.program, 'frame');
this._uniLocation.backbuffer = this._gl.getUniformLocation(this.program, 'backbuffer');
this._attLocation = this._gl.getAttribLocation(this.program, 'position'); this._attLocation = this._gl.getAttribLocation(this.program, 'position');
this._mousePosition= [0, 0]; this._mousePosition= [0, 0];
@ -226,6 +302,13 @@ class RepaShader extends HTMLElement {
this._gl.useProgram(this.program); this._gl.useProgram(this.program);
this._gl.bindFramebuffer(this._gl.FRAMEBUFFER, this.frontbuffer.framebuffer);
// backbuffer
this._gl.activeTexture(this._gl.TEXTURE0);
this._gl.bindTexture(this._gl.TEXTURE_2D, this.backbuffer.texture);
this._gl.uniform1i(this._uniLocation.backbuffer, 0);
this._gl.enableVertexAttribArray(this._attLocation); this._gl.enableVertexAttribArray(this._attLocation);
this._gl.vertexAttribPointer(this._attLocation, 3, this._gl.FLOAT, false, 0, 0); this._gl.vertexAttribPointer(this._attLocation, 3, this._gl.FLOAT, false, 0, 0);
this._gl.clear(this._gl.COLOR_BUFFER_BIT); this._gl.clear(this._gl.COLOR_BUFFER_BIT);
@ -236,7 +319,22 @@ class RepaShader extends HTMLElement {
this._gl.drawArrays(this._gl.TRIANGLE_STRIP, 0, 4); this._gl.drawArrays(this._gl.TRIANGLE_STRIP, 0, 4);
// fill buffer
this._gl.useProgram(this._postProgram);
this._gl.bindFramebuffer(this._gl.FRAMEBUFFER, null);
this._gl.activeTexture(this._gl.TEXTURE0);
this._gl.bindTexture(this._gl.TEXTURE_2D, this.frontbuffer.texture);
this._gl.enableVertexAttribArray(this._postAttLocation);
this._gl.vertexAttribPointer(this._postAttLocation, 3, this._gl.FLOAT, false, 0, 0);
this._gl.clear(this._gl.COLOR_BUFFER_BIT);
this._gl.uniform1i(this._postUniLocation.texture, 0);
this._gl.drawArrays(this._gl.TRIANGLE_STRIP, 0, 4);
this._gl.flush(); this._gl.flush();
// swap buffers
[this.frontbuffer, this.backbuffer] = [this.backbuffer, this.frontbuffer];
// TODO draw callback // TODO draw callback
} }
@ -319,12 +417,33 @@ class RepaShader extends HTMLElement {
in vec3 position; in vec3 position;
void main(){ void main(){
gl_Position=vec4(position, 1.); gl_Position=vec4(position, 1.);
} }`;
`; }
get postVS() {
return `#version 300 es
in vec3 position;
out vec2 vTexCoord;
void main() {
vTexCoord = (position.xy + 1.0) * 0.5;
gl_Position = vec4(position, 1.);
}`;
}
get postFS() {
return `#version 300 es
precision mediump float;
uniform sampler2D drawTexture;
in vec2 vTexCoord;
layout (location = 0) out vec4 outColor;
void main() {
outColor = texture(drawTexture, vTexCoord);
}`;
} }
async getFS() { async getFS() {
// auto guessing mode // auto guessing mode
// - starts with #version -> raw
// - contains `precision` -> twigl classic300es // - contains `precision` -> twigl classic300es
// - no `precision`, but has `main()` -> twigl geeker300es // - no `precision`, but has `main()` -> twigl geeker300es
// - no `precision`, no `main()` -> twigl geekest300es // - no `precision`, no `main()` -> twigl geekest300es
@ -350,6 +469,8 @@ void main(){
let end = ''; let end = '';
let snippets = ''; let snippets = '';
switch (mode) { switch (mode) {
case 'raw':
return this._fsSource;
case 'classic': case 'classic':
start = CHUNKS.es300; start = CHUNKS.es300;
break; break;