Переход на CpuRenderEngine

src/Canvas.zig

@@ -42,8 +42,6 @@ pub fn deinit(self: *Canvas) void {
 /// Заполнить canvas градиентом
 pub fn redrawExample(self: *Canvas) !void {
     const full = self.getScaledImageSize();
-    const full_w: u32 = full.w;
-    const full_h: u32 = full.h;
 
     const vis: ImageRect = self._visible_rect orelse ImageRect{ .x = 0, .y = 0, .w = 0, .h = 0 };
 
@@ -55,58 +53,20 @@ pub fn redrawExample(self: *Canvas) !void {
         return;
     }
 
-    const width: u32 = vis.w;
-    const height: u32 = vis.h;
-
-    // const new_texture = self.render_engine.example(width, height);
-
-    // Выделить буфер пиксельных данных
-    const pixels = try self.allocator.alloc(Color.PMA, @as(usize, width) * height);
-    defer self.allocator.free(pixels);
-
-    std.debug.print("w={any}, fw={any};\th={any}, fh={any}\n", .{ width, full_w, height, full_h });
-
-    var y: u32 = 0;
-    while (y < height) : (y += 1) {
-        var x: u32 = 0;
-        while (x < width) : (x += 1) {
-            const gx: u32 = vis.x + x;
-            const gy: u32 = vis.y + y;
-
-            const denom_x: f32 = if (full_w > 1) @as(f32, @floatFromInt(full_w - 1)) else 1;
-            const denom_y: f32 = if (full_h > 1) @as(f32, @floatFromInt(full_h - 1)) else 1;
-            const fx: f32 = @as(f32, @floatFromInt(gx)) / denom_x;
-            const fy: f32 = @as(f32, @floatFromInt(gy)) / denom_y;
-            const factor: f32 = std.math.clamp((fx + fy) / 2, 0, 1);
-
-            const r_f: f32 = @as(f32, @floatFromInt(self.gradient_start.r)) + factor * (@as(f32, @floatFromInt(self.gradient_end.r)) - @as(f32, @floatFromInt(self.gradient_start.r)));
-            const g_f: f32 = @as(f32, @floatFromInt(self.gradient_start.g)) + factor * (@as(f32, @floatFromInt(self.gradient_end.g)) - @as(f32, @floatFromInt(self.gradient_start.g)));
-            const b_f: f32 = @as(f32, @floatFromInt(self.gradient_start.b)) + factor * (@as(f32, @floatFromInt(self.gradient_end.b)) - @as(f32, @floatFromInt(self.gradient_start.b)));
-
-            const r: u8 = @intFromFloat(std.math.clamp(r_f, 0, 255));
-            const g: u8 = @intFromFloat(std.math.clamp(g_f, 0, 255));
-            const b: u8 = @intFromFloat(std.math.clamp(b_f, 0, 255));
-            pixels[y * width + x] = .{ .r = r, .g = g, .b = b, .a = 255 };
-        }
-    }
+    const new_texture = self.render_engine.example(.{ .w = full.w, .h = full.h }, vis) catch null;
 
+    if (new_texture) |tex| {
         // Удалить старую текстуру
-    if (self.texture) |tex| {
-        dvui.Texture.destroyLater(tex);
+        if (self.texture) |old_tex| {
+            dvui.Texture.destroyLater(old_tex);
         }
 
-    // Создать новую текстуру из пиксельных данных
-    self.texture = try dvui.textureCreate(pixels, width, height, .nearest);
+        self.texture = tex;
+    }
 }
 
-/// Заполнить canvas случайным градиентом
+// Ресетнуть example изображение в renderEngine
 pub fn exampleReset(self: *Canvas) !void {
-    // Сгенерировать случайные цвета градиента
-    var prng = std.Random.DefaultPrng.init(@intCast(std.time.microTimestamp()));
-    const random = prng.random();
-    self.gradient_start = Color.PMA{ .r = random.int(u8), .g = random.int(u8), .b = random.int(u8), .a = 255 };
-    self.gradient_end = Color.PMA{ .r = random.int(u8), .g = random.int(u8), .b = random.int(u8), .a = 255 };
-
     self.render_engine.exampleReset();
     try self.redrawExample();
 }

src/WindowContext.zig

@@ -7,6 +7,7 @@ const WindowContext = @This();
 allocator: std.mem.Allocator,
 canvas: Canvas,
 cpu_render: *CpuRenderEngine,
+frame_index: u64,
 
 pub fn init(allocator: std.mem.Allocator) !WindowContext {
     var self: WindowContext = undefined;
@@ -18,6 +19,8 @@ pub fn init(allocator: std.mem.Allocator) !WindowContext {
 
     self.canvas = Canvas.init(allocator, self.cpu_render.renderEngine());
 
+    self.frame_index = 0;
+
     return self;
 }
 

src/main.zig

@@ -33,7 +33,6 @@ pub fn main() !void {
     defer ctx.deinit();
 
     var interrupted = false;
-
     main_loop: while (true) {
         // beginWait coordinates with waitTime below to run frames only when needed
         const nstime = win.beginWait(interrupted);
@@ -89,12 +88,12 @@ fn gui_frame(ctx: *WindowContext) bool {
     var left_panel = dvui.box(@src(), .{ .dir = .vertical }, .{ .expand = .vertical, .min_size_content = .{ .w = 200 }, .background = true });
     {
         dvui.label(@src(), "Tools", .{}, .{});
-        if (dvui.button(@src(), "Fill Random Color", .{}, .{})) {
+        if (dvui.button(@src(), "Fill Random Color", .{}, .{}) or ctx.frame_index == 0) {
             canvas.exampleReset() catch |err| {
                 std.debug.print("Error filling canvas: {}\n", .{err});
             };
-            canvas.pos = .{ .x = 400, .y = 400 };
-            canvas.setZoom(dvui.windowNaturalScale());
+            ctx.canvas.pos = .{ .x = 400, .y = 400 };
+            ctx.canvas.setZoom(dvui.windowNaturalScale());
         }
         if (dvui.checkbox(@src(), &canvas.native_scaling, "Scaling", .{})) {}
     }
@@ -222,5 +221,7 @@ fn gui_frame(ctx: *WindowContext) bool {
     }
     back.deinit();
 
+    ctx.frame_index += 1;
+
     return true;
 }

src/render/CpuRenderEngine.zig

@@ -35,10 +35,43 @@ pub fn exampleReset(self: *CpuRenderEngine) void {
 }
 
 pub fn example(self: CpuRenderEngine, canvas_size: ImageSize, visible_rect: ImageRect) !?dvui.Texture {
-    _ = self;
-    _ = canvas_size;
-    _ = visible_rect;
-    return null;
+    const full_w = canvas_size.w;
+    const full_h = canvas_size.h;
+
+    const width = visible_rect.w;
+    const height = visible_rect.h;
+
+    // Выделить буфер пиксельных данных
+    const pixels = try self._allocator.alloc(Color.PMA, @as(usize, width) * height);
+    defer self._allocator.free(pixels);
+
+    std.debug.print("w={any}, fw={any};\th={any}, fh={any}\n", .{ width, full_w, height, full_h });
+
+    var y: u32 = 0;
+    while (y < height) : (y += 1) {
+        var x: u32 = 0;
+        while (x < width) : (x += 1) {
+            const gx: u32 = visible_rect.x + x;
+            const gy: u32 = visible_rect.y + y;
+
+            const denom_x: f32 = if (full_w > 1) @as(f32, @floatFromInt(full_w - 1)) else 1;
+            const denom_y: f32 = if (full_h > 1) @as(f32, @floatFromInt(full_h - 1)) else 1;
+            const fx: f32 = @as(f32, @floatFromInt(gx)) / denom_x;
+            const fy: f32 = @as(f32, @floatFromInt(gy)) / denom_y;
+            const factor: f32 = std.math.clamp((fx + fy) / 2, 0, 1);
+
+            const r_f: f32 = @as(f32, @floatFromInt(self.gradient_start.r)) + factor * (@as(f32, @floatFromInt(self.gradient_end.r)) - @as(f32, @floatFromInt(self.gradient_start.r)));
+            const g_f: f32 = @as(f32, @floatFromInt(self.gradient_start.g)) + factor * (@as(f32, @floatFromInt(self.gradient_end.g)) - @as(f32, @floatFromInt(self.gradient_start.g)));
+            const b_f: f32 = @as(f32, @floatFromInt(self.gradient_start.b)) + factor * (@as(f32, @floatFromInt(self.gradient_end.b)) - @as(f32, @floatFromInt(self.gradient_start.b)));
+
+            const r: u8 = @intFromFloat(std.math.clamp(r_f, 0, 255));
+            const g: u8 = @intFromFloat(std.math.clamp(g_f, 0, 255));
+            const b: u8 = @intFromFloat(std.math.clamp(b_f, 0, 255));
+            pixels[y * width + x] = .{ .r = r, .g = g, .b = b, .a = 255 };
+        }
+    }
+
+    return try dvui.textureCreate(pixels, width, height, .nearest);
 }
 
 pub fn renderEngine(self: *CpuRenderEngine) RenderEngine {