use texture for rendering planets

web/pw-visualizer/assets/shaders/frag/image.glsl

@@ -10,5 +10,4 @@ uniform sampler2D u_texture;
 
 void main() {
    gl_FragColor = texture2D(u_texture, v_texCoord);
-//    gl_FragColor = vec4(0.7, 0.7, 0.0, 1.0);
 }

web/pw-visualizer/assets/shaders/frag/masked_image.glsl

@@ -0,0 +1,21 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+// Passed in from the vertex shader.
+varying vec2 v_texCoord;
+
+uniform float u_step_interval;
+uniform float u_time;
+uniform vec3 u_color;
+uniform vec3 u_color_next;
+
+
+// The texture.
+uniform sampler2D u_texture;
+
+void main() {
+   float alpha = texture2D(u_texture, v_texCoord).a;
+   vec3 color = mix(u_color, u_color_next, u_time);
+   gl_FragColor = vec4(color, alpha);
+}

web/pw-visualizer/src/assets.ts

@@ -4,9 +4,13 @@ export {default as earthSvg} from "../assets/res/earth.svg";
 export {default as marsSvg} from "../assets/res/mars.svg";
 export {default as venusSvg} from "../assets/res/venus.svg";
 
+export {default as earthPng} from "../assets/res/earth.png";
+
 export {default as fontPng} from "../assets/res/font.png";
 
 export {default as imageFragmentShader} from "../assets/shaders/frag/image.glsl?url";
+export {default as maskedImageFragmentShader} from "../assets/shaders/frag/masked_image.glsl?url";
+
 export {default as simpleFragmentShader} from "../assets/shaders/frag/simple.glsl?url";
 export {default as vorFragmentShader} from "../assets/shaders/frag/vor.glsl?url";
 

web/pw-visualizer/src/index.ts

@@ -22,12 +22,13 @@ import {
   UniformMatrix3fv,
   UniformBool,
 } from "./webgl/shader";
-import { Renderer } from "./webgl/renderer";
+import { DefaultRenderable, Renderer } from "./webgl/renderer";
 import { VertexBuffer, IndexBuffer } from "./webgl/buffer";
 import { VertexBufferLayout, VertexArray } from "./webgl/vertexBufferLayout";
 import { defaultLabelFactory, LabelFactory, Align, Label } from "./webgl/text";
 import { VoronoiBuilder } from "./voronoi/voronoi";
 import * as assets from "./assets";
+import { Texture } from "./webgl/texture";
 
 
 function to_bbox(box: number[]): BBox {
@@ -133,6 +134,7 @@ export class GameInstance {
   shader: Shader;
   vor_shader: Shader;
   image_shader: Shader;
+  masked_image_shader: Shader;
 
   text_factory: LabelFactory;
   planet_labels: Label[];
@@ -174,6 +176,7 @@ export class GameInstance {
     this.vor_shader = shaders["vor"].create_shader(GL, {
       PLANETS: "" + planets.length,
     });
+    this.masked_image_shader = shaders["masked_image"].create_shader(GL);
 
     this.text_factory = defaultLabelFactory(GL, this.image_shader);
     this.planet_labels = [];
@@ -234,45 +237,53 @@ export class GameInstance {
   }
 
   _create_planets(planets: Float32Array, meshes: Mesh[]) {
+    const earth = Texture.fromImage(GL, assets.earthPng, 'earth');
+
     for (let i = 0; i < this.planet_count; i++) {
       {
         const transform = new UniformMatrix3fv([
-          1,
-          0,
-          0,
-          0,
-          1,
-          0,
-          -planets[i * 3],
-          -planets[i * 3 + 1],
-          1,
+          1,                0,                    0,
+          0,                1,                    0,
+          -planets[i * 3],  -planets[i * 3 + 1],  1, // TODO: why are negations needed?
         ]);
 
-        const indexBuffer = new IndexBuffer(
-          GL,
-          meshes[i % meshes.length].cells
-        );
-        const positionBuffer = new VertexBuffer(
-          GL,
-          meshes[i % meshes.length].positions
-        );
+        const gl = GL;
+        const ib = new IndexBuffer(gl, [
+          0, 1, 2,
+          1, 2, 3
+        ]);
+        const vb_pos = new VertexBuffer(gl, [
+          -1,  1,
+           1,  1,
+          -1, -1,
+           1, -1
+        ]);
+        const vb_tex = new VertexBuffer(gl, [
+          0, 0,
+          1, 0,
+          0, 1,
+          1, 1]);
+    
+        const layout_pos = new VertexBufferLayout();
+        // 2?
+        layout_pos.push(gl.FLOAT, 2, 4, "a_position");
+    
+        const layout_tex = new VertexBufferLayout();
+        layout_tex.push(gl.FLOAT, 2, 4, "a_texCoord");
     
-        const layout = new VertexBufferLayout();
-        layout.push(GL.FLOAT, 3, 4, "a_position");
         const vao = new VertexArray();
-        vao.addBuffer(positionBuffer, layout);
+        vao.addBuffer(vb_pos, layout_pos);
+        vao.addBuffer(vb_tex, layout_tex);
         
-        this.renderer.addToDraw(
-          indexBuffer,
-          vao,
-          this.shader,
-          {
+        const uniforms = {
           u_trans: transform,
           u_trans_next: transform,
-          },
-          [],
-          LAYERS.planet
-        );
+        };
+  
+        const renderable = new DefaultRenderable(ib, vao, this.masked_image_shader, [earth], uniforms);
+    
+        this.renderer.addRenderable(renderable, LAYERS.planet);
+    
       }
 
       {
@@ -430,25 +441,30 @@ export class GameInstance {
       this.use_vor = false;
     }
 
+    const shaders_to_update = [
+      this.shader,
+      this.image_shader,
+      this.masked_image_shader,
+    ];
+
+
     // If not playing, still reder with different viewbox, so people can still pan etc.
     if (!this.playing) {
       this.last_time = time;
 
-      this.shader.uniform(
+      shaders_to_update.forEach((shader) => {
+        shader.uniform(
           GL,
           "u_viewbox",
           new Uniform4f(this.resizer.get_viewbox())
         );  
+      })
+
       this.vor_shader.uniform(
         GL,
         "u_viewbox",
         new Uniform4f(this.resizer.get_viewbox())
       );
-      this.image_shader.uniform(
-        GL,
-        "u_viewbox",
-        new Uniform4f(this.resizer.get_viewbox())
-      );
 
       this.renderer.render(GL);
       return;
@@ -481,39 +497,24 @@ export class GameInstance {
     this.vor_shader.uniform(GL, "u_resolution", new Uniform2f(RESOLUTION));
     this.vor_shader.uniform(GL, "u_vor", new UniformBool(this.use_vor));
 
-    this.shader.uniform(
+    shaders_to_update.forEach((shader) => {
+      shader.uniform(
         GL,
         "u_time",
         new Uniform1f((time - this.last_time) / ms_per_frame)
       );
-    this.shader.uniform(
+      shader.uniform(
         GL,
         "u_mouse",
         new Uniform2f(this.resizer.get_mouse_pos())
       );
-    this.shader.uniform(
+      shader.uniform(
         GL,
         "u_viewbox",
         new Uniform4f(this.resizer.get_viewbox())
       );
-    this.shader.uniform(GL, "u_resolution", new Uniform2f(RESOLUTION));
-
-    this.image_shader.uniform(
-      GL,
-      "u_time",
-      new Uniform1f((time - this.last_time) / ms_per_frame)
-    );
-    this.image_shader.uniform(
-      GL,
-      "u_mouse",
-      new Uniform2f(this.resizer.get_mouse_pos())
-    );
-    this.image_shader.uniform(
-      GL,
-      "u_viewbox",
-      new Uniform4f(this.resizer.get_viewbox())
-    );
-    this.image_shader.uniform(GL, "u_resolution", new Uniform2f(RESOLUTION));
+      shader.uniform(GL, "u_resolution", new Uniform2f(RESOLUTION));
+    });
 
     // Render
     this.renderer.render(GL);
@@ -616,6 +617,15 @@ export async function set_instance(source: string): Promise<GameInstance> {
             assets.simpleVertexShader,
           ),
         ])(),
+      (async () =>
+        <[string, ShaderFactory]>[
+          "masked_image",
+          await ShaderFactory.create_factory(
+            assets.maskedImageFragmentShader,
+            assets.simpleVertexShader,
+          ),
+        ])(),
+
     ];
     let shaders_array: [string, ShaderFactory][];
     [meshes, shaders_array] = await Promise.all([

web/pw-visualizer/src/webgl/index.ts

@@ -57,8 +57,8 @@ async function main() {
         return;
     }
 
+    // TODO: do we still need this?
     const mesh = await url_to_mesh("static/res/images/earth.svg");
-    console.log(Math.max(...mesh.positions), Math.min(...mesh.positions));
     const renderer = new Renderer();
 
     const factory = await ShaderFactory.create_factory(assets.simpleFragmentShader, assets.simpleVertexShader);