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83 lines
3.4 KiB
83 lines
3.4 KiB
function schedule_draw(state, context) { |
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if (!state.timers.raf) { |
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window.requestAnimationFrame(() => draw(state, context)); |
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state.timers.raf = true; |
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} |
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} |
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function draw(state, context) { |
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state.timers.raf = false; |
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const gl = context.gl; |
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const width = window.innerWidth; |
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const height = window.innerHeight; |
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let locations; |
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let buffers; |
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gl.viewport(0, 0, context.canvas.width, context.canvas.height); |
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gl.clearColor(context.bgcolor.r, context.bgcolor.g, context.bgcolor.b, 1); |
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gl.clear(gl.COLOR_BUFFER_BIT); |
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// Draw images |
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locations = context.locations['quad']; |
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buffers = context.buffers['quad']; |
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gl.useProgram(context.programs['quad']); |
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gl.enableVertexAttribArray(locations['a_pos']); |
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gl.enableVertexAttribArray(locations['a_texcoord']); |
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gl.uniform2f(locations['u_res'], context.canvas.width, context.canvas.height); |
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gl.uniform2f(locations['u_scale'], state.canvas.zoom, state.canvas.zoom); |
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gl.uniform2f(locations['u_translation'], state.canvas.offset.x, state.canvas.offset.y); |
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gl.uniform1i(locations['u_layer'], 0); |
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gl.bindBuffer(gl.ARRAY_BUFFER, buffers['b_pos']); |
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gl.vertexAttribPointer(locations['a_pos'], 2, gl.FLOAT, false, 0, 0); |
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gl.bufferData(gl.ARRAY_BUFFER, context.quad_positions_f32, gl.STATIC_DRAW); |
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gl.bindBuffer(gl.ARRAY_BUFFER, buffers['b_texcoord']); |
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gl.vertexAttribPointer(locations['a_texcoord'], 2, gl.FLOAT, false, 0, 0); |
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gl.bufferData(gl.ARRAY_BUFFER, context.quad_texcoords_f32, gl.STATIC_DRAW); |
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let tex_index = 0; |
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for (const key in context.textures) { |
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gl.bindTexture(gl.TEXTURE_2D, context.textures[key]); |
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gl.drawArrays(gl.TRIANGLES, tex_index * 6, 6); |
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++tex_index; |
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} |
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// Draw strokes |
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locations = context.locations['stroke']; |
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buffers = context.buffers['stroke']; |
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gl.useProgram(context.programs['stroke']); |
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gl.enableVertexAttribArray(locations['a_pos']); |
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gl.enableVertexAttribArray(locations['a_color']); |
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gl.uniform2f(locations['u_res'], context.canvas.width, context.canvas.height); |
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gl.uniform2f(locations['u_scale'], state.canvas.zoom, state.canvas.zoom); |
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gl.uniform2f(locations['u_translation'], state.canvas.offset.x, state.canvas.offset.y); |
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gl.uniform1i(locations['u_layer'], 1); |
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const total_pos_size = context.static_positions_f32.byteLength + context.dynamic_positions_f32.byteLength; |
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const total_color_size = context.static_colors_u8.byteLength + context.dynamic_colors_u8.byteLength; |
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const total_point_count = (context.static_positions.length + total_dynamic_positions(context)) / 2; |
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gl.bindBuffer(gl.ARRAY_BUFFER, buffers['b_pos']); |
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gl.vertexAttribPointer(locations['a_pos'], 2, gl.FLOAT, false, 0, 0); |
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gl.bufferData(gl.ARRAY_BUFFER, total_pos_size, gl.DYNAMIC_DRAW); |
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gl.bufferSubData(gl.ARRAY_BUFFER, 0, context.static_positions_f32); |
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gl.bufferSubData(gl.ARRAY_BUFFER, context.static_positions_f32.byteLength, context.dynamic_positions_f32); |
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gl.bindBuffer(gl.ARRAY_BUFFER, buffers['b_color']); |
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gl.vertexAttribPointer(locations['a_color'], 3, gl.UNSIGNED_BYTE, true, 0, 0); |
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gl.bufferData(gl.ARRAY_BUFFER, total_color_size, gl.DYNAMIC_DRAW); |
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gl.bufferSubData(gl.ARRAY_BUFFER, 0, context.static_colors_u8); |
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gl.bufferSubData(gl.ARRAY_BUFFER, context.static_colors_u8.byteLength, context.dynamic_colors_u8); |
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gl.drawArrays(gl.TRIANGLES, 0, total_point_count); |
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} |