Added support for Textures

assets/genetica/READ ME.txt

@@ -0,0 +1,3 @@
+For a description of the contents of this pack, usage rights, and other useful details, go here:
+
+http://blog.spiralgraphics.biz/2011/02/nine-cartoon-backdrops.html

src/js/draw.js

@@ -1,4 +1,5 @@
 import { Vec2 } from "./common.js";
+import { Texture } from "./graphics.js";
 function drawTriangle(gfx, positions, color) {
     const a_position = gfx.getAttribute("a_position");
     const a_color = gfx.getAttribute("a_color");
@@ -35,7 +36,6 @@ function drawTriangleExts(gfx, position, exts, color) {
 }
 function drawRectangle(gfx, position, exts, color) {
     const a_position = gfx.getAttribute("a_position");
-    const a_color = gfx.getAttribute("a_color");
     const points = [
         position.x, position.y,
         position.x + exts.x, position.y,
@@ -44,6 +44,23 @@ function drawRectangle(gfx, position, exts, color) {
         position.x + exts.x, position.y,
         position.x, position.y + exts.y,
     ];
+    if (color instanceof Texture) {
+        const a_tex_position = gfx.getAttribute("a_tex_position");
+        const uv = [
+            0.0, 0.0,
+            -1.0, 0.0,
+            0.0, -1.0,
+            -1.0, -1.0,
+            -1.0, 0.0,
+            0.0, -1.0,
+        ];
+        a_position.data(gfx.ctx, points, gfx.ctx.STATIC_DRAW);
+        a_tex_position.data(gfx.ctx, uv, gfx.ctx.STATIC_DRAW);
+        gfx.ctx.bindTexture(gfx.ctx.TEXTURE_2D, color.tex);
+        gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 6);
+    }
+    else {
+        const a_color = gfx.getAttribute("a_color");
         const colors = [
             color,
             color,
@@ -56,6 +73,7 @@ function drawRectangle(gfx, position, exts, color) {
         a_color.data(gfx.ctx, colors.flat(), gfx.ctx.STATIC_DRAW);
         gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 6);
     }
+}
 function drawCircle(gfx, position, radius, color) {
     const points = new Array();
     const precision = 40;

src/js/draw.ts

@@ -1,5 +1,5 @@
 import { Vec2, Color } from "./common.js"
-import { Graphics } from "./graphics.js";
+import { Graphics, Texture } from "./graphics.js";
 
 function drawTriangle(gfx: Graphics, positions: [Vec2, Vec2, Vec2], color: Color) {
     const a_position = gfx.getAttribute("a_position");
@@ -43,9 +43,8 @@ function drawTriangleExts(gfx: Graphics, position: Vec2, exts: Vec2, color: Colo
     gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 3);
 }
 
-function drawRectangle(gfx: Graphics, position: Vec2, exts: Vec2, color: Color) {
+function drawRectangle(gfx: Graphics, position: Vec2, exts: Vec2, color: Color | Texture) {
     const a_position = gfx.getAttribute("a_position");
-    const a_color = gfx.getAttribute("a_color");
 
     const points: Array<number> = [
         position.x, position.y,
@@ -57,6 +56,25 @@ function drawRectangle(gfx: Graphics, position: Vec2, exts: Vec2, color: Color)
         position.x, position.y + exts.y,
     ]
 
+    if (color instanceof Texture) {
+        const a_tex_position = gfx.getAttribute("a_tex_position");
+        
+        const uv: Array<number> = [
+            0.0, 0.0,
+            -1.0, 0.0,
+            0.0, -1.0,
+            -1.0, -1.0,
+            -1.0, 0.0,
+            0.0, -1.0,
+        ];
+
+        a_position.data(gfx.ctx, points, gfx.ctx.STATIC_DRAW);
+        a_tex_position.data(gfx.ctx, uv, gfx.ctx.STATIC_DRAW);
+        gfx.ctx.bindTexture(gfx.ctx.TEXTURE_2D, color.tex);
+        gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 6);
+    } else {
+        const a_color = gfx.getAttribute("a_color");
+
         const colors: Array<number[]> = [
             color,
             color,
@@ -69,6 +87,7 @@ function drawRectangle(gfx: Graphics, position: Vec2, exts: Vec2, color: Color)
         a_position.data(gfx.ctx, points, gfx.ctx.STATIC_DRAW);
         a_color.data(gfx.ctx, colors.flat(), gfx.ctx.STATIC_DRAW);
         gfx.ctx.drawArrays(gfx.ctx.TRIANGLES, 0, 6);
+    }
 
 }
 

src/js/graphics.js

@@ -107,4 +107,30 @@ class Attribute {
         ctx.vertexAttribPointer(this.loc, this.size, this.type, this.normalized, this.stride, this.offset);
     }
 }
-export { fullscreenCanvas, Graphics, Attribute };
+class Texture {
+    tex;
+    constructor(tex) {
+        this.tex = tex;
+    }
+    static async load(ctx, path) {
+        let image = await loadTexture(path);
+        let tex = ctx.createTexture();
+        ctx.bindTexture(ctx.TEXTURE_2D, tex);
+        ctx.texImage2D(ctx.TEXTURE_2D, 0, ctx.RGBA, ctx.RGBA, ctx.UNSIGNED_BYTE, image);
+        ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_MAG_FILTER, ctx.LINEAR);
+        ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_MIN_FILTER, ctx.LINEAR_MIPMAP_NEAREST);
+        ctx.generateMipmap(ctx.TEXTURE_2D);
+        ctx.bindTexture(ctx.TEXTURE_2D, null);
+        return new Texture(tex);
+    }
+}
+async function loadTexture(path) {
+    return new Promise(resolve => {
+        const img = new Image();
+        img.addEventListener("load", () => {
+            resolve(img);
+        });
+        img.src = path;
+    });
+}
+export { Texture, fullscreenCanvas, Graphics, Attribute };

src/js/graphics.ts

@@ -1,5 +1,3 @@
-import { Vec2 } from "./common.js"
-
 function fullscreenCanvas(gfx: Graphics, id: string) {
     const canvas  = document.getElementById(id) as HTMLCanvasElement;
     canvas.width  = window.innerWidth;
@@ -145,4 +143,36 @@ class Attribute {
     }
 }
 
-export { fullscreenCanvas, Graphics, Attribute }
+class Texture {
+    tex: WebGLTexture | null;
+
+    constructor(tex: WebGLTexture) {
+        this.tex = tex;
+    }
+
+    static async load(ctx: WebGL2RenderingContext, path: string): Promise<Texture> {
+        let image = await loadTexture(path);
+        
+        let tex = ctx.createTexture();
+        ctx.bindTexture(ctx.TEXTURE_2D, tex);
+        ctx.texImage2D(ctx.TEXTURE_2D, 0, ctx.RGBA, ctx.RGBA, ctx.UNSIGNED_BYTE, image);
+        ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_MAG_FILTER, ctx.LINEAR);
+        ctx.texParameteri(ctx.TEXTURE_2D, ctx.TEXTURE_MIN_FILTER, ctx.LINEAR_MIPMAP_NEAREST);
+        ctx.generateMipmap(ctx.TEXTURE_2D);
+        ctx.bindTexture(ctx.TEXTURE_2D, null);
+
+        return new Texture(tex);
+    }
+}
+
+async function loadTexture(path: string): Promise<HTMLImageElement> {
+    return new Promise(resolve => {
+        const img = new Image();
+        img.addEventListener("load", () => {
+            resolve(img);
+        })
+        img.src = path;
+    });
+}
+
+export { Texture, fullscreenCanvas, Graphics, Attribute }

src/js/script.js

@@ -1,32 +1,35 @@
 import { initializeContext, Vec2, Mat4 } from "./common.js";
-import { Graphics, fullscreenCanvas } from "./graphics.js";
+import { Graphics, fullscreenCanvas, Texture } from "./graphics.js";
 import * as drawing from "./draw.js";
 import * as wasm from "./wasm.js";
 const vertexShader = `#version 300 es
      
     in vec2 a_position;
-    in vec4 a_color;
+    in vec2 a_tex_position;
-    out vec4 color;
+    out vec2 v_tex_position;
     uniform mat4 u_matrix;
      
     void main() {
         vec4 transformed = u_matrix * vec4(a_position.xy, 0.0, 1.0);
 
         gl_Position = transformed;
-        color = a_color;
+        v_tex_position = a_tex_position;
     }
 `;
 const fragmentShader = `#version 300 es
 
     precision highp float;
-    in vec4 color;
+
+    in vec2 v_tex_position;
     out vec4 outColor;
 
+    uniform sampler2D u_texture;
+
     void main() {
-      outColor = color;
+      outColor = texture(u_texture, v_tex_position);
     }
 `;
-function draw(gfx, angle) {
+function draw(gfx, angle, tex) {
     gfx.clear(0, 0, 0, 0);
     let left = 0;
     let right = gfx.ctx.canvas.width;
@@ -39,7 +42,7 @@ function draw(gfx, angle) {
     m = m.mult(Mat4.rotation_y(angle));
     m = m.mult(Mat4.rotation_z(angle));
     gfx.ctx.uniformMatrix4fv(gfx.getUniform("u_matrix"), false, m.splat());
-    drawing.drawRectangle(gfx, new Vec2(gfx.ctx.canvas.width / 2 - 50, gfx.ctx.canvas.height / 2 - 50), new Vec2(100, 100), [1, 0, 0, 1]);
+    drawing.drawRectangle(gfx, new Vec2(gfx.ctx.canvas.width / 2 - 200, gfx.ctx.canvas.height / 2 - 200), new Vec2(400, 400), tex);
 }
 (async () => {
     const canvasId = "game";
@@ -50,16 +53,19 @@ function draw(gfx, angle) {
     fullscreenCanvas(gfx, canvasId);
     const a_position = gfx.createAttribute("a_position");
     a_position.format(2, gfx.ctx.FLOAT, false, 0, 0);
-    const a_color = gfx.createAttribute("a_color");
+    //const a_color = gfx.createAttribute("a_color");
-    a_color.format(4, gfx.ctx.FLOAT, false, 0, 0);
+    //a_color.format(4, gfx.ctx.FLOAT, false, 0, 0);
+    const a_tex_position = gfx.createAttribute("a_tex_position");
+    a_tex_position.format(2, gfx.ctx.FLOAT, false, 0, 0);
     gfx.createUniform("u_matrix");
+    let city = await Texture.load(ctx, "../../assets/genetica/rt/City Night.jpg");
     let angle = 0;
     let prevTimestamp = 0;
     const frame = (timestamp) => {
         const deltaTime = (timestamp - prevTimestamp) / 1000;
         prevTimestamp = timestamp;
         fullscreenCanvas(gfx, "game");
-        draw(gfx, angle);
+        draw(gfx, angle, city);
         angle += Math.PI * deltaTime * 0.5;
         window.requestAnimationFrame(frame);
     };

src/js/script.ts

@@ -1,5 +1,5 @@
 import { initializeContext, Vec2, Mat4, Vec4 } from "./common.js";
-import { Graphics, fullscreenCanvas } from "./graphics.js";
+import { Graphics, fullscreenCanvas, Texture } from "./graphics.js";
 import * as drawing from "./draw.js";
 import * as wasm from "./wasm.js";
 
@@ -7,15 +7,15 @@ const vertexShader =
     `#version 300 es
      
     in vec2 a_position;
-    in vec4 a_color;
+    in vec2 a_tex_position;
-    out vec4 color;
+    out vec2 v_tex_position;
     uniform mat4 u_matrix;
      
     void main() {
         vec4 transformed = u_matrix * vec4(a_position.xy, 0.0, 1.0);
 
         gl_Position = transformed;
-        color = a_color;
+        v_tex_position = a_tex_position;
     }
 `;
 
@@ -23,17 +23,20 @@ const fragmentShader =
     `#version 300 es
 
     precision highp float;
-    in vec4 color;
+
+    in vec2 v_tex_position;
     out vec4 outColor;
 
+    uniform sampler2D u_texture;
+
     void main() {
-      outColor = color;
+      outColor = texture(u_texture, v_tex_position);
     }
 `;
 
 
 
-function draw(gfx: Graphics, angle: number) {
+function draw(gfx: Graphics, angle: number, tex: Texture) {
     gfx.clear(0, 0, 0, 0);
 
     let left = 0;
@@ -56,9 +59,9 @@ function draw(gfx: Graphics, angle: number) {
 
     drawing.drawRectangle(
         gfx, 
-        new Vec2(gfx.ctx.canvas.width / 2 - 50, gfx.ctx.canvas.height / 2 - 50),
+        new Vec2(gfx.ctx.canvas.width / 2 - 200, gfx.ctx.canvas.height / 2 - 200),
-        new Vec2(100, 100),
+        new Vec2(400, 400),
-        [1, 0, 0, 1]);
+        tex);
 }
 
 (async () => {
@@ -72,11 +75,16 @@ function draw(gfx: Graphics, angle: number) {
     const a_position = gfx.createAttribute("a_position");
     a_position.format(2, gfx.ctx.FLOAT, false, 0, 0);
 
-    const a_color = gfx.createAttribute("a_color");
+    //const a_color = gfx.createAttribute("a_color");
-    a_color.format(4, gfx.ctx.FLOAT, false, 0, 0);
+    //a_color.format(4, gfx.ctx.FLOAT, false, 0, 0);
+
+    const a_tex_position = gfx.createAttribute("a_tex_position");
+    a_tex_position.format(2, gfx.ctx.FLOAT, false, 0, 0);
 
     gfx.createUniform("u_matrix");
 
+    let city = await Texture.load(ctx, "../../assets/genetica/rt/City Night.jpg");
+
     let angle = 0;
     let prevTimestamp = 0;
     const frame = (timestamp: number) => {
@@ -84,7 +92,7 @@ function draw(gfx: Graphics, angle: number) {
         prevTimestamp = timestamp;
 
         fullscreenCanvas(gfx, "game");
-        draw(gfx, angle);
+        draw(gfx, angle, city);
         angle += Math.PI * deltaTime * 0.5;
 
         window.requestAnimationFrame(frame);