Ajout d'entités "glitch" a la scene

2026-04-20 23:11:05 +02:00
parent f1229866d1
commit 3d5bef4153
5 changed files with 231 additions and 69 deletions
@@ -1,9 +1,9 @@
-attribute vec4 aVertexPosition;
+attribute vec2 aVertexPosition;
 attribute vec2 aTextureCoord;

 varying highp vec2 vTextureCoord;

 void main() {
-    gl_Position = aVertexPosition;
+    gl_Position = vec4(aVertexPosition, 0.0, 1.0);
    vTextureCoord = aTextureCoord;
 }
@@ -0,0 +1,3 @@
+void main() {
+    gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
+}
@@ -0,0 +1,17 @@
+attribute vec4 aVertexPosition;
+
+uniform vec2 uGlitchPosition;
+uniform float uGlitchWidth;
+uniform vec2 uImageRatio;
+
+void main() {
+    vec2 vertex = aVertexPosition.xy;
+
+    vertex *= uImageRatio;
+    vertex *= 0.001;
+    vertex *= uGlitchWidth;
+    vertex += uGlitchPosition;
+
+    gl_Position = vec4(vertex, -1.0, 1.0);
+}
+
@@ -1,12 +1,18 @@
-import resizeToFit from 'intrinsic-scale';
+import resizeToFit from 'intrinsic-scale'
+
 import baseVertSource from "./base.vert?raw"
 import baseFragSource from "./base.frag?raw"

+import glitchVertSource from "./glitch.vert?raw"
+import glitchFragSource from "./glitch.frag?raw"
+
 export class Glitcher {

    /** @type {HTMLCanvasElement} */
    canvas

+    gliches = []
+
    /**
     * @param {HTMLCanvasElement} canvas
     */
@@ -21,35 +27,7 @@ export class Glitcher {
            throw new Error("WebGL isn't supported")
        }

-        let baseVertShader = this.ctx.createShader(this.ctx.VERTEX_SHADER)
-        this.ctx.shaderSource(baseVertShader, baseVertSource)
-        this.ctx.compileShader(baseVertShader)
-
-        if (!this.ctx.getShaderParameter(baseVertShader, this.ctx.COMPILE_STATUS)) {
-            throw new Error(`failed to compile base.vert: ${this.ctx.getShaderInfoLog(baseVertShader)}`)
-        }
-
-        let baseFragShader = this.ctx.createShader(this.ctx.FRAGMENT_SHADER)
-        this.ctx.shaderSource(baseFragShader, baseFragSource)
-        this.ctx.compileShader(baseFragShader)
-
-        if (!this.ctx.getShaderParameter(baseFragShader, this.ctx.COMPILE_STATUS)) {
-            throw new Error(`failed to compile base.frag: ${this.ctx.getShaderInfoLog(baseFragShader)}`)
-        }
-
-        let baseShaderProgram = this.ctx.createProgram()
-        this.ctx.attachShader(baseShaderProgram, baseVertShader)
-        this.ctx.attachShader(baseShaderProgram, baseFragShader)
-        this.ctx.linkProgram(baseShaderProgram)
-
-        if (!this.ctx.getProgramParameter(baseShaderProgram, this.ctx.LINK_STATUS)) {
-            throw new Error(`failed to link base shaders: ${this.ctx.getProgramInfoLog(baseShaderProgram)}`)
-        }
-
-        this.baseProgram = baseShaderProgram;
-        this.aVertexPosition = this.ctx.getAttribLocation(baseShaderProgram, "aVertexPosition")
-        this.aTextureCoord = this.ctx.getAttribLocation(baseShaderProgram, "aTextureCoord")
-        this.uImageSampler = this.ctx.getUniformLocation(baseShaderProgram, "uImageSampler")
+        let baseProgram = createProgram(this.ctx, baseVertSource, baseFragSource);

        let panelPositionBuffer = this.ctx.createBuffer()
        this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, panelPositionBuffer)
@@ -60,7 +38,6 @@ export class Glitcher {
               1.0, -1.0,
        ]
        this.ctx.bufferData(this.ctx.ARRAY_BUFFER, new Float32Array(positions), this.ctx.STATIC_DRAW)
-        this.panelPositionsBuffer = panelPositionBuffer

        let panelUVBuffer = this.ctx.createBuffer()
        this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, panelUVBuffer)
@@ -71,11 +48,41 @@ export class Glitcher {
              1.0, 1.0,
        ]
        this.ctx.bufferData(this.ctx.ARRAY_BUFFER, new Float32Array(uv), this.ctx.STATIC_DRAW)
-        this.panelUVBuffer = panelUVBuffer

        let imageTexture = this.ctx.createTexture()
-        this.imageTexture = imageTexture;
+
+        this.base = {
+            program: baseProgram,
+            aVertexPosition: this.ctx.getAttribLocation(baseProgram, "aVertexPosition"),
+            aTextureCoord: this.ctx.getAttribLocation(baseProgram, "aTextureCoord"),
+            uImageSampler: this.ctx.getUniformLocation(baseProgram, "uImageSampler"),
+            imageTexture: imageTexture,
+            panelUVBuffer: panelUVBuffer,
+            panelPositionsBuffer: panelPositionBuffer
+        }
        this.clearImage();
+
+
+        let glitchPositionBuffer = this.ctx.createBuffer()
+        this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, glitchPositionBuffer)
+        const glitchPosition = [
+            -1.0,  1.0,
+            1.0,  1.0,
+            -1.0, -1.0,
+            1.0, -1.0,
+        ]
+        this.ctx.bufferData(this.ctx.ARRAY_BUFFER, new Float32Array(glitchPosition), this.ctx.STATIC_DRAW)
+
+        let glitchProgram = createProgram(this.ctx, glitchVertSource, glitchFragSource)
+
+        this.glitch = {
+            program: glitchProgram,
+            aVertexPosition: this.ctx.getAttribLocation(glitchProgram, "aVertexPosition"),
+            uGlitchPosition: this.ctx.getUniformLocation(glitchProgram, "uGlitchPosition"),
+            uGlitchWidth: this.ctx.getUniformLocation(glitchProgram, "uGlitchWidth"),
+            uImageRatio: this.ctx.getUniformLocation(glitchProgram, "uImageRatio"),
+            glitchPositionBuffer: glitchPositionBuffer
+        }
    }

    clearImage(){
@@ -92,6 +99,22 @@ export class Glitcher {
        )
    }

+    clearGlitch(){
+        this.glitches = []
+    }
+
+    addGlitch(x, y, width=1){
+        let computedStyle = window.getComputedStyle(this.canvas)
+        let clientWidth = parseFloat(computedStyle.width)
+        let clientHeight = parseFloat(computedStyle.height)
+
+        this.glitches.push({
+            x: ((x*2)/clientWidth)-1,
+            y: (((y*2)/clientHeight)-1)*-1,
+            width
+        })
+    }
+
    /**
     * @param {File} imageFile 
     */
@@ -132,7 +155,7 @@ export class Glitcher {
        this.currentImageFile = imageFile
        this.currentImage = image

-        this.ctx.bindTexture(this.ctx.TEXTURE_2D, this.imageTexture)
+        this.ctx.bindTexture(this.ctx.TEXTURE_2D, this.base.imageTexture)
        this.ctx.texImage2D(
            this.ctx.TEXTURE_2D,
            0,
@@ -184,38 +207,99 @@ export class Glitcher {

        this.ctx.clear(this.ctx.COLOR_BUFFER_BIT | this.ctx.DEPTH_BUFFER_BIT)

-        this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, this.panelPositionsBuffer)
-        this.ctx.vertexAttribPointer(
-            this.aVertexPosition,
-            2, // N components per iteration
-            this.ctx.FLOAT,
-            false, //Normalize,
-            0, // (stride) how many bytes to get from one set of values to the next
-            0, // Start offset
-        )
-        this.ctx.enableVertexAttribArray(this.aVertexPosition)
-        
-        this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, this.panelUVBuffer)
-        this.ctx.vertexAttribPointer(
-            this.aTextureCoord,
-            2,
-            this.ctx.FLOAT,
-            false,
-            0,
-            0,
-        )
-        this.ctx.enableVertexAttribArray(this.aTextureCoord)
+        { // Base rendering
+            this.ctx.useProgram(this.base.program)
+            this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, this.base.panelPositionsBuffer)
+            this.ctx.vertexAttribPointer(
+                this.base.aVertexPosition,
+                2, // N components per iteration
+                this.ctx.FLOAT,
+                false, //Normalize,
+                0, // (stride) how many bytes to get from one set of values to the next
+                0, // Start offset
+            )
+            this.ctx.enableVertexAttribArray(this.base.aVertexPosition)
+            
+            this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, this.base.panelUVBuffer)
+            this.ctx.vertexAttribPointer(
+                this.base.aTextureCoord,
+                2,
+                this.ctx.FLOAT,
+                false,
+                0,
+                0,
+            )
+            this.ctx.enableVertexAttribArray(this.base.aTextureCoord)

-        this.ctx.activeTexture(this.ctx.TEXTURE0)
-        this.ctx.bindTexture(this.ctx.TEXTURE_2D, this.imageTexture)
-        this.ctx.uniform1i(this.uImageSampler, 0)
+            this.ctx.activeTexture(this.ctx.TEXTURE0)
+            this.ctx.bindTexture(this.ctx.TEXTURE_2D, this.base.imageTexture)
+            
+            this.ctx.uniform1i(this.base.uImageSampler, 0)
+            
+            this.ctx.drawArrays(
+                this.ctx.TRIANGLE_STRIP,
+                0, // Vertex offset
+                4, // Total vertex
+            );
+        }

-        this.ctx.useProgram(this.baseProgram)
-        
-        this.ctx.drawArrays(
-            this.ctx.TRIANGLE_STRIP,
-            0, // Vertex offset
-            4, // Total vertex
-        );
+        { // Glitch rendering
+            this.ctx.useProgram(this.glitch.program)
+            this.ctx.bindBuffer(this.ctx.ARRAY_BUFFER, this.glitch.glitchPositionBuffer)
+            this.ctx.vertexAttribPointer(
+                this.glitch.glitchPositionBuffer,
+                2, // N components per iteration
+                this.ctx.FLOAT,
+                false, //Normalize,
+                0, // (stride) how many bytes to get from one set of values to the next
+                0, // Start offset
+            )
+            
+            this.ctx.enableVertexAttribArray(this.glitch.aVertexPosition)
+            if(this.canvas.width > this.canvas.height){
+                this.ctx.uniform2f(this.glitch.uImageRatio, 1.0, this.canvas.width/this.canvas.height)
+            } else {
+                this.ctx.uniform2f(this.glitch.uImageRatio, this.canvas.height/this.canvas.width, 1.0)
+            }
+
+            for(let glitch of this.glitches) {
+                this.ctx.uniform2f(this.glitch.uGlitchPosition, glitch.x, glitch.y)
+                this.ctx.uniform1f(this.glitch.uGlitchWidth, glitch.width)
+                this.ctx.drawArrays(
+                    this.ctx.TRIANGLE_STRIP,
+                    0, // Vertex offset
+                    4, // Total vertex
+                );
+            }
+        }
    }
+}
+
+function createProgram(gl, vertSource, fragSource){
+        let vertShader = gl.createShader(gl.VERTEX_SHADER)
+        gl.shaderSource(vertShader, vertSource)
+        gl.compileShader(vertShader)
+
+        if (!gl.getShaderParameter(vertShader, gl.COMPILE_STATUS)) {
+            throw new Error(`failed to compile vertex: ${gl.getShaderInfoLog(vertShader)}`)
+        }
+
+        let fragShader = gl.createShader(gl.FRAGMENT_SHADER)
+        gl.shaderSource(fragShader, fragSource)
+        gl.compileShader(fragShader)
+
+        if (!gl.getShaderParameter(fragShader, gl.COMPILE_STATUS)) {
+            throw new Error(`failed to compile fragment: ${gl.getShaderInfoLog(fragShader)}`)
+        }
+
+        let program = gl.createProgram()
+        gl.attachShader(program, vertShader)
+        gl.attachShader(program, fragShader)
+        gl.linkProgram(program)
+
+        if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
+            throw new Error(`failed to link shader: ${gl.getProgramInfoLog(program)}`)
+        }
+
+        return program
 }