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add caching to graph drawing

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This commit is contained in:
Rokas Puzonas 2024-12-01 17:02:09 +02:00
parent 0d9033c926
commit 801f9f6ef4
2 changed files with 118 additions and 39 deletions
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12
src/app.zig
View File

@ -19,7 +19,9 @@ const Vec2 = rl.Vector2;
const App = @This();
const Channel = struct {
view_rect: Graph.ViewRectangle,
view_cache: Graph.Cache = .{},
view_rect: Graph.ViewOptions,
min_value: f64,
max_value: f64,
samples: union(enum) {
@ -58,10 +60,11 @@ pub fn init(
}
pub fn deinit(self: *App) void {
for (self.channels.items) |channel| {
for (self.channels.items) |*channel| {
if (channel.samples == .owned) {
self.allocator.free(channel.samples.owned);
}
channel.view_cache.deinit();
}
self.channels.deinit();
self.task_pool.deinit(self.allocator);
@ -163,14 +166,17 @@ pub fn tick(self: *App) !void {
{
var channels_stack = UI.Stack.init(RectUtils.shrink(graphs_rect, 10), .top_to_bottom);
for (self.channels.items) |channel| {
for (self.channels.items) |*channel| {
const channel_rect = channels_stack.next(128);
Graph.draw(
&channel.view_cache,
channel_rect,
channel.view_rect,
channel.samples.owned
);
rl.drawRectangleLinesEx(channel_rect, 1, rl.Color.black);
}
}

145
src/graph.zig
View File

@ -6,7 +6,7 @@ const assert = std.debug.assert;
const Vec2 = rl.Vector2;
const clamp = std.math.clamp;
pub const ViewRectangle = struct {
pub const ViewOptions = struct {
from: f32, // inclusive
to: f32, // exclusive
min_value: f64,
@ -16,12 +16,29 @@ pub const ViewRectangle = struct {
dot_size: f32 = 2
};
pub const Cache = struct {
texture: ?rl.RenderTexture2D = null,
options: ?ViewOptions = null,
pub fn deinit(self: *Cache) void {
if (self.texture) |texture| {
texture.unload();
self.texture = null;
}
self.options = null;
}
pub fn invalidate(self: *Cache) void {
self.options = null;
}
};
fn remap(comptime T: type, from_min: T, from_max: T, to_min: T, to_max: T, value: T) T {
const t = (value - from_min) / (from_max - from_min);
return std.math.lerp(to_min, to_max, t);
}
fn mapSampleX(draw_rect: rl.Rectangle, view_rect: ViewRectangle, index: f64) f64 {
fn mapSampleX(draw_rect: rl.Rectangle, view_rect: ViewOptions, index: f64) f64 {
return remap(
f64,
view_rect.from, view_rect.to,
@ -30,16 +47,16 @@ fn mapSampleX(draw_rect: rl.Rectangle, view_rect: ViewRectangle, index: f64) f64
);
}
fn mapSampleY(draw_rect: rl.Rectangle, view_rect: ViewRectangle, sample: f64) f64 {
fn mapSampleY(draw_rect: rl.Rectangle, view_rect: ViewOptions, sample: f64) f64 {
return remap(
f64,
view_rect.min_value, view_rect.max_value,
@floatCast(draw_rect.y + draw_rect.height), @floatCast(draw_rect.y),
draw_rect.y + draw_rect.height, draw_rect.y,
sample
);
}
fn mapSamplePointToGraph(draw_rect: rl.Rectangle, view_rect: ViewRectangle, index: f64, sample: f64) Vec2 {
fn mapSamplePointToGraph(draw_rect: rl.Rectangle, view_rect: ViewOptions, index: f64, sample: f64) Vec2 {
return .{
.x = @floatCast(mapSampleX(draw_rect, view_rect, index)),
.y = @floatCast(mapSampleY(draw_rect, view_rect, sample))
@ -56,22 +73,20 @@ fn clampIndexUsize(value: f32, size: usize) usize {
return @intFromFloat(clamp(value, 0, size_f32));
}
pub fn draw(draw_rect: rl.Rectangle, view_rect: ViewRectangle, samples: []const f64) void {
assert(view_rect.left_aligned); // TODO:
assert(view_rect.to > view_rect.from);
fn drawSamples(draw_rect: rl.Rectangle, options: ViewOptions, samples: []const f64) void {
assert(options.left_aligned); // TODO:
assert(options.to > options.from);
rl.drawRectangleLinesEx(draw_rect, 1, rl.Color.black);
if (options.from > @as(f32, @floatFromInt(samples.len))) return;
if (options.to < 0) return;
if (view_rect.from > @as(f32, @floatFromInt(samples.len))) return;
if (view_rect.to < 0) return;
const sample_count = view_rect.to - view_rect.from;
const sample_count = options.to - options.from;
const samples_per_column = sample_count / draw_rect.width;
const samples_threshold = 2;
if (samples_per_column >= samples_threshold) {
var i = clampIndex(view_rect.from, samples.len);
while (i < clampIndex(view_rect.to, samples.len)) : (i += samples_per_column) {
var i = clampIndex(options.from, samples.len);
while (i < clampIndex(options.to, samples.len)) : (i += samples_per_column) {
const from_index = clampIndexUsize(i, samples.len);
const to_index = clampIndexUsize(i+samples_per_column, samples.len);
const column_samples = samples[from_index..to_index];
@ -85,32 +100,32 @@ pub fn draw(draw_rect: rl.Rectangle, view_rect: ViewRectangle, samples: []const
column_max = @max(column_max, sample);
}
const x = mapSampleX(draw_rect, view_rect, @floatFromInt(from_index));
const y_min = mapSampleY(draw_rect, view_rect, column_min);
const y_max = mapSampleY(draw_rect, view_rect, column_max);
const x = mapSampleX(draw_rect, options, @floatFromInt(from_index));
const y_min = mapSampleY(draw_rect, options, column_min);
const y_max = mapSampleY(draw_rect, options, column_max);
if (column_samples.len == 1) {
rl.drawLineV(
mapSamplePointToGraph(draw_rect, view_rect, i, samples[from_index]),
mapSamplePointToGraph(draw_rect, view_rect, i-1, samples[clampIndexUsize(i-1, samples.len-1)]),
view_rect.color
mapSamplePointToGraph(draw_rect, options, i, samples[from_index]),
mapSamplePointToGraph(draw_rect, options, i-1, samples[clampIndexUsize(i-1, samples.len-1)]),
options.color
);
rl.drawLineV(
mapSamplePointToGraph(draw_rect, view_rect, i, samples[from_index]),
mapSamplePointToGraph(draw_rect, view_rect, i+1, samples[clampIndexUsize(i+1, samples.len-1)]),
view_rect.color
mapSamplePointToGraph(draw_rect, options, i, samples[from_index]),
mapSamplePointToGraph(draw_rect, options, i+1, samples[clampIndexUsize(i+1, samples.len-1)]),
options.color
);
} else if (@abs(y_max - y_min) < 1) {
rl.drawPixelV(
.{ .x = @floatCast(x), .y = @floatCast(y_min) },
view_rect.color
options.color
);
} else {
rl.drawLineV(
.{ .x = @floatCast(x), .y = @floatCast(y_min) },
.{ .x = @floatCast(x), .y = @floatCast(y_max) },
view_rect.color
options.color
);
}
}
@ -124,29 +139,87 @@ pub fn draw(draw_rect: rl.Rectangle, view_rect: ViewRectangle, samples: []const
defer rl.endScissorMode();
{
const from_index = clampIndexUsize(@floor(view_rect.from), samples.len);
const to_index = clampIndexUsize(@ceil(view_rect.to) + 1, samples.len);
const from_index = clampIndexUsize(@floor(options.from), samples.len);
const to_index = clampIndexUsize(@ceil(options.to) + 1, samples.len);
for (from_index..(to_index-1)) |i| {
const from_point = mapSamplePointToGraph(draw_rect, view_rect, @floatFromInt(i), samples[i]);
const to_point = mapSamplePointToGraph(draw_rect, view_rect, @floatFromInt(i + 1), samples[i + 1]);
rl.drawLineV(from_point, to_point, view_rect.color);
const from_point = mapSamplePointToGraph(draw_rect, options, @floatFromInt(i), samples[i]);
const to_point = mapSamplePointToGraph(draw_rect, options, @floatFromInt(i + 1), samples[i + 1]);
rl.drawLineV(from_point, to_point, options.color);
}
}
{
const from_index = clampIndexUsize(@ceil(view_rect.from), samples.len);
const to_index = clampIndexUsize(@ceil(view_rect.to), samples.len);
const from_index = clampIndexUsize(@ceil(options.from), samples.len);
const to_index = clampIndexUsize(@ceil(options.to), samples.len);
const min_circle_size = 0.5;
const max_circle_size = view_rect.dot_size;
const max_circle_size = options.dot_size;
var circle_size = remap(f32, samples_threshold, 0.2, min_circle_size, max_circle_size, samples_per_column);
circle_size = @min(circle_size, max_circle_size);
for (from_index..to_index) |i| {
const center = mapSamplePointToGraph(draw_rect, view_rect, @floatFromInt(i), samples[i]);
rl.drawCircleV(center, circle_size, view_rect.color);
const center = mapSamplePointToGraph(draw_rect, options, @floatFromInt(i), samples[i]);
rl.drawCircleV(center, circle_size, options.color);
}
}
}
}
pub fn draw(cache: ?*Cache, draw_rect: rl.Rectangle, options: ViewOptions, samples: []const f64) void {
if (cache) |c| {
const render_width: i32 = @intFromFloat(@ceil(draw_rect.width));
const render_height: i32 = @intFromFloat(@ceil(draw_rect.height));
// Unload render texture if rendering width or height changed
if (c.texture) |render_texture| {
const texure = render_texture.texture;
if (texure.width != render_width or texure.height != render_height) {
render_texture.unload();
c.texture = null;
c.options = null;
}
}
if (c.texture == null) {
const texture = rl.loadRenderTexture(render_width, render_height);
// TODO: Maybe fallback to just drawing without caching, if GPU doesn't have enough memory?
assert(rl.isRenderTextureReady(texture));
c.texture = texture;
}
const render_texture = c.texture.?;
if (c.options != null and std.meta.eql(c.options.?, options)) {
const source = rl.Rectangle{
.x = 0,
.y = 0,
.width = @floatFromInt(render_texture.texture.width),
.height = @floatFromInt(-render_texture.texture.height)
};
rl.drawTexturePro(
render_texture.texture,
source,
draw_rect,
rl.Vector2.zero(),
0, rl.Color.white
);
return;
}
c.options = options;
render_texture.begin();
rl.gl.rlPushMatrix();
rl.gl.rlTranslatef(-draw_rect.x, -draw_rect.y, 0);
}
drawSamples(draw_rect, options, samples);
if (cache) |c| {
rl.gl.rlPopMatrix();
const render_texture = c.texture.?;
render_texture.end();
}
}