The images are in

.gitignore

@@ -1,4 +1,5 @@
 server/images
+server/server.log
 doca.txt
 data/
 client/*.dot

README.txt

@@ -8,8 +8,8 @@ Release:
         + Do not copy memory to wasm, instead use wasm memory to store data in the first place
         + SIMD for LOD?
         + Multithreading for LOD
+        + Textured quads (pictures, code already written in older version)
         - Z-prepass fringe bug (also, when do we enable the prepass?)
-        - Textured quads (pictures, code already written in older version)
         - Resize and move pictures (draw handles)
     + Bugs
         + GC stalls!!!
@@ -41,6 +41,7 @@ Release:
         - Eraser
         - Line drawing
         + Undo
+            - Undo for images
         - Redo
     * Polish
         + Use typedvector where appropriate
@@ -68,7 +69,8 @@ Bonus:
         - Move multiple points
     * Customizable background
         + Dots pattern
-        * Grid pattern
+        + Grid pattern
+        - Menu option
 
 Bonus-bonus:
     - Actually infinite canvas (replace floats with something, some kind of fixed point scheme? chunks? multilevel scheme?)

client/client_recv.js

@@ -372,6 +372,7 @@ function handle_event(state, context, event, options = {}) {
                     event.width = bitmap.width;
                     event.height = bitmap.height;
 
+                    geometry_add_dummy_stroke(context);
                     add_image(context, event.image_id, bitmap, p);
 
                     // God knows when this will actually complete (it loads the image from the server)

client/index.js

@@ -104,7 +104,7 @@ let b_fast = true;
 
 function start_spinner(state) {
     const str = describeArc(64, 64, 32, a_angel, b_angel);
-
+4
     a_angel += speed_a;
     b_angel += speed_b;
 
@@ -243,6 +243,7 @@ async function main() {
         'buffers': {},
         'locations': {},
         'textures': {},
+        'images': [],
 
         'dynamic_serializer': serializer_create(config.initial_dynamic_bytes),
         'dynamic_index_serializer': serializer_create(config.initial_dynamic_bytes),

client/webgl_draw.js

@@ -180,8 +180,6 @@ async function draw(state, context, animate, ts) {
         gl.uniform2f(locations['u_translation'], state.canvas.offset.x, state.canvas.offset.y);
         gl.uniform1f(locations['u_fadeout'], 1.0);
 
-        // Opacity for major lines goes on a curve 0 / 1 \ 0
-
         // Previous level (major lines)
         {
             const grid_instances = new Float32Array(geometry_gen_fullscreen_grid_1d(state, context, 32 / zoom_previous, 32 / zoom_previous));
@@ -200,7 +198,7 @@ async function draw(state, context, animate, ts) {
         {
             const grid_instances = new Float32Array(geometry_gen_fullscreen_grid_1d(state, context, 32 / zoom_next, 32 / zoom_next));
             let t = (zoom_next / zoom - 1) / 7;
-            t = Math.min(0.1, -t + 1);
+            t = Math.min(0.1, -t + 1); // slight fade-in
 
             gl.uniform1f(locations['u_fadeout'], t);
 
@@ -211,7 +209,42 @@ async function draw(state, context, animate, ts) {
         }
     }
 
-    gl.clear(gl.DEPTH_BUFFER_BIT); // draw strokes above the background pattern
+    gl.clear(gl.DEPTH_BUFFER_BIT); // draw images above the background pattern
+    gl.useProgram(context.programs['image']);
+    buffers = context.buffers['image'];
+    locations = context.locations['image'];
+    {
+        let offset = 0;
+
+        const quads = geometry_image_quads(state, context);
+
+        gl.bindBuffer(gl.ARRAY_BUFFER, buffers['b_quads']);
+        gl.bufferData(gl.ARRAY_BUFFER, quads, gl.STATIC_DRAW);
+        gl.vertexAttribDivisor(locations['a_pos'], 0);
+
+        gl.enableVertexAttribArray(locations['a_pos']);
+        gl.vertexAttribPointer(locations['a_pos'], 2, gl.FLOAT, false, 2 * 4, 0);
+
+        for (const entry of context.images) {
+            if (state.active_image === entry.key) {
+                //gl.uniform1i(locations['u_active'], 1);
+            } else {
+                //gl.uniform1i(locations['u_active'], 0);
+            }
+
+            gl.uniform2f(locations['u_res'], context.canvas.width, context.canvas.height);
+            gl.uniform2f(locations['u_scale'], state.canvas.zoom, state.canvas.zoom);
+            gl.uniform2f(locations['u_translation'], state.canvas.offset.x, state.canvas.offset.y);
+            gl.uniform1i(locations['u_texture'], 0); // Only 1 active texture for each drawcall
+
+            gl.bindTexture(gl.TEXTURE_2D, entry.texture);
+            gl.drawArrays(gl.TRIANGLES, offset, 6);
+
+            offset += 6;
+        }
+    }
+
+    gl.clear(gl.DEPTH_BUFFER_BIT); // draw strokes above the images 
     gl.useProgram(context.programs['sdf'].main);
     buffers = context.buffers['sdf'];
     locations = context.locations['sdf'].main;

client/webgl_geometry.js

@@ -203,40 +203,22 @@ function add_image(context, image_id, bitmap, p) {
     const x = p.x;
     const y = p.y;
     const gl = context.gl;
-    const id = Object.keys(context.textures['image']).length;
-
-    context.textures['image'][id] = {
+    const id = Object.keys(context.images).length;
+    const entry = {
         'texture': gl.createTexture(),
-        'image_id': image_id
+        'key': image_id,
+        'at': p,
+        'width': bitmap.width,
+        'height': bitmap.height,
     };
 
-    gl.bindTexture(gl.TEXTURE_2D, context.textures['image'][id].texture);
+    context.images.push(entry);
+
+    gl.bindTexture(gl.TEXTURE_2D, entry.texture);
     gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, bitmap);
     gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
     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);
-
-    context.quad_positions.push(...[
-        x,                 y,
-        x,                 y + bitmap.height,
-        x + bitmap.width,  y + bitmap.height,
-
-        x + bitmap.width,  y,
-        x,                 y,
-        x + bitmap.width,  y + bitmap.height,
-    ]);
-
-    context.quad_texcoords.push(...[
-        0, 0,
-        0, 1,
-        1, 1,
-        1, 0,
-        0, 0,
-        1, 1,
-    ]);
-
-    context.quad_positions_f32 = new Float32Array(context.quad_positions);
-    context.quad_texcoords_f32 = new Float32Array(context.quad_texcoords);
 }
 
 function move_image(context, image_event) {
@@ -365,3 +347,31 @@ function geometry_gen_fullscreen_grid_1d(state, context, step_x, step_y) {
 
     return result;
 }
+
+function geometry_image_quads(state, context) {
+    const result = new Float32Array(context.images.length * 12);
+
+    for (let i = 0; i < context.images.length; ++i) {
+        const entry = context.images[i];
+
+        result[i * 12 + 0] = entry.at.x;
+        result[i * 12 + 1] = entry.at.y;
+
+        result[i * 12 + 2] = entry.at.x + entry.width;
+        result[i * 12 + 3] = entry.at.y;
+
+        result[i * 12 + 4] = entry.at.x;
+        result[i * 12 + 5] = entry.at.y + entry.height;
+
+        result[i * 12 + 6] = entry.at.x + entry.width;
+        result[i * 12 + 7] = entry.at.y + entry.height;
+
+        result[i * 12 + 8] = entry.at.x;
+        result[i * 12 + 9] = entry.at.y + entry.height;
+
+        result[i * 12 + 10] = entry.at.x + entry.width;
+        result[i * 12 + 11] = entry.at.y;
+    }
+
+    return result;
+}

client/webgl_listeners.js

@@ -653,7 +653,5 @@ async function on_drop(e, state, context) {
     const file = e.dataTransfer.files[0];
     await insert_image(state, context, file);
 
-    schedule_draw(state, context);
-
     return false;
 }

client/webgl_shaders.js

@@ -105,43 +105,32 @@ const sdf_vs_src = `#version 300 es
     in vec2 a_a; // point from
     in vec2 a_b; // point to
     in int a_stroke_id;
-
     in vec2 a_pressure;
-
     uniform vec2 u_scale;
     uniform vec2 u_res;
     uniform vec2 u_translation;
     uniform int u_stroke_count;
     uniform int u_stroke_texture_size;
-
     uniform highp usampler2D u_stroke_data;
-
     out vec4 v_line;
     out vec2 v_texcoord;
     out vec3 v_color;
-
     flat out vec2 v_thickness;
-
     void main() {
         vec2 screen02; 
         float apron = 1.0; // google "futanari inflation rule 34"
         
         int stroke_data_y = a_stroke_id / u_stroke_texture_size;
         int stroke_data_x = a_stroke_id % u_stroke_texture_size;
-
         uvec4 stroke_data = texelFetch(u_stroke_data, ivec2(stroke_data_x, stroke_data_y), 0);
         float radius = float(stroke_data.w);
-
         vec2 line_dir = normalize(a_b - a_a);
         vec2 up_dir = vec2(line_dir.y, -line_dir.x);
         vec2 pixel = vec2(2.0) / u_res * apron;
         float rscale = apron / u_scale.x;
-
         int vertex_index = gl_VertexID % 6;
-
         vec2 outwards;
         vec2 origin;
-
         if (vertex_index == 0) {
             // "top left" aka "p1"
             origin = a_a;
@@ -163,17 +152,13 @@ const sdf_vs_src = `#version 300 es
         vec2 pos = origin + normalize(outwards) * radius * 2.0 * max(a_pressure.x, a_pressure.y); // doubling is to account for max possible pressure
         screen02 = (pos.xy * u_scale + u_translation) / u_res * 2.0 + outwards * pixel;
         v_texcoord = pos.xy + outwards * rscale;
-
         screen02.y = 2.0 - screen02.y;
-
         v_line = vec4(a_a, a_b);        
         v_thickness = radius * a_pressure; // pressure 0.5 is the "neutral" pressure
         v_color = vec3(stroke_data.xyz) / 255.0;
-
         if (a_stroke_id >> 31 != 0) {
             screen02 += vec2(100.0); // shift offscreen
         }
-
         gl_Position = vec4(screen02 - 1.0, (float(a_stroke_id) / float(u_stroke_count)) * 2.0 - 1.0, 1.0);
     }
 `;
@@ -212,7 +197,6 @@ const sdf_fs_src = `#version 300 es
 
 const tquad_vs_src = `#version 300 es
     in vec2 a_pos;
-    in vec2 a_texcoord;
      
     uniform vec2 u_scale;
     uniform vec2 u_res;
@@ -225,7 +209,19 @@ const tquad_vs_src = `#version 300 es
         vec2 screen02 = screen01 * 2.0;
         screen02.y = 2.0 - screen02.y;
         vec2 screen11 = screen02 - 1.0;
-        v_texcoord = a_texcoord;
+
+        int vertex_index = gl_VertexID % 6;
+
+        if (vertex_index == 0) {
+            v_texcoord = vec2(0.0, 0.0);
+        } else if (vertex_index == 1 || vertex_index == 5) {
+            v_texcoord = vec2(1.0, 0.0);
+        } else if (vertex_index == 2 || vertex_index == 4) {
+            v_texcoord = vec2(0.0, 1.0);
+        } else {
+            v_texcoord = vec2(1.0, 1.0);
+        }
+
         gl_Position = vec4(screen11, 0, 1);
     }
 `;
@@ -236,16 +232,11 @@ const tquad_fs_src = `#version 300 es
     in vec2 v_texcoord;
      
     uniform sampler2D u_texture;
-    uniform bool u_outline;
 
     layout(location = 0) out vec4 FragColor;
 
     void main() {
-        if (!u_outline) {
         FragColor = texture(u_texture, v_texcoord);
-        } else {
-            FragColor = mix(texture(u_texture, v_texcoord), vec4(0.7, 0.7, 0.95, 1), 0.5);
-        }
     }
 `;
 
@@ -407,6 +398,15 @@ function init_webgl(state, context) {
         'grid': create_program(gl, grid_vs, dots_fs),
     };
 
+    context.locations['image'] = {
+        'a_pos':             gl.getAttribLocation(context.programs['image'], 'a_pos'),
+
+        'u_res':             gl.getUniformLocation(context.programs['image'], 'u_res'),
+        'u_scale':           gl.getUniformLocation(context.programs['image'], 'u_scale'),
+        'u_translation':     gl.getUniformLocation(context.programs['image'], 'u_translation'),
+        'u_texture':         gl.getUniformLocation(context.programs['image'], 'u_texture'),
+    };
+
     context.locations['debug'] = {
         'a_pos':             gl.getAttribLocation(context.programs['debug'], 'a_pos'),
 
@@ -468,6 +468,10 @@ function init_webgl(state, context) {
         'b_packed': gl.createBuffer(),
     };
 
+    context.buffers['image'] = {
+        'b_quads': gl.createBuffer(),
+    };
+
     context.buffers['sdf'] = {
         'b_instance': gl.createBuffer(),
         'b_dynamic_instance': gl.createBuffer(),

server/http.js

@@ -9,7 +9,7 @@ export async function route(req) {
         const desk_id = url.searchParams.get('deskId') || '0';
         const formdata = await req.formData();
         const file = formdata.get('file');
-        const image_id = math.fast_random32();
+        const image_id = math.crypto_random32();
         
         Bun.write(config.IMAGEDIR + '/' + image_id, file);