From c511ae90162f506f34ca0b98732577dc688ebcca Mon Sep 17 00:00:00 2001
From: Patrick
Date: Sun, 27 Sep 2026 10:57:03 +0200
Subject: initial state

---
 src/main.zig          | 50 +++++++++++++++++++++++++++++++++++++++-----------
 src/shaders/main.glsl | 21 ++++++++++-----------
 2 files changed, 49 insertions(+), 22 deletions(-)

(limited to 'src')

diff --git a/src/main.zig b/src/main.zig
index 4c6d98a..9f68540 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -9,8 +9,9 @@ const slog = sokol.log;
 const sg = sokol.gfx;
 const sapp = sokol.app;
 const sglue = sokol.glue;
-const imgui = sokol.imgui;
-const appimgui = sokol.appimgui;
+const simgui = sokol.imgui;
+const sappimgui = sokol.appimgui;
+const ig = @import("cimgui_docking");
 const vec3 = @import("math.zig").Vec3;
 const mat4 = @import("math.zig").Mat4;
 const shd = @import("shaders/main.glsl.zig");
@@ -20,6 +21,8 @@ const state = struct {
         var pass_action: sg.PassAction = .{};
         var pip: sg.Pipeline = .{};
         var bind: sg.Bindings = .{};
+        var vs: shd.VsParams = .{.position = .{0,0}};
+        var fs: shd.FsParams = .{.color = .{1,0,0,1}};
     };
 };
 
@@ -29,16 +32,21 @@ export fn init() void {
         .logger = .{ .func = slog.func },
     });
 
-    imgui.setup(.{});
-    appimgui.setup();
+    simgui.setup(.{});
+    sappimgui.setup();
+    ig.igGetIO().*.ConfigFlags |= ig.ImGuiConfigFlags_DockingEnable;
 
     // default pass action: clear to blue-ish
     state.display.pass_action.colors[0] = .{
         .load_action = .CLEAR,
-        .clear_value = .{ .r = 0.25, .g = 0.45, .b = 0.65, .a = 1.0 },
+        .clear_value = .{ .r = 1, .g = 0, .b = 0, .a = 1.0 },
     };
 
-    const vbuf = sg.makeBuffer(.{});
+    const vbuf = sg.makeBuffer(.{.data = sg.asRange(&[6]f32 {
+        -1.0, -1.0,
+        -1.0,  3.0,
+         3.0, -1.0,
+    })});
     state.display.bind.vertex_buffers[0] = vbuf;
 
     // shader and pipeline object for the default render pass
@@ -46,10 +54,9 @@ export fn init() void {
         .shader = sg.makeShader(shd.offscreenShaderDesc(sg.queryBackend())),
         .layout = init: {
             var l = sg.VertexLayoutState{};
-            l.attrs[shd.ATTR_offscreen_position] = .{};
+            l.attrs[shd.ATTR_offscreen_vpos] = .{ .format = .FLOAT2 };
             break :init l;
         },
-        .index_type = .UINT16,
         .cull_mode = .BACK,
         .depth = .{
             .compare = .LESS_EQUAL,
@@ -59,25 +66,46 @@ export fn init() void {
 }
 
 export fn event(ev: [*c]const sapp.Event) void {
-    appimgui.trackEvent(ev.*);
+    sappimgui.trackEvent(ev.*);
+    // forward input events to sokol-imgui
+    _ = simgui.handleEvent(ev.*);
 }
 
 export fn frame() void {
+    // call simgui.newFrame() before any ImGui calls
+    simgui.newFrame(.{
+        .width = sapp.width(),
+        .height = sapp.height(),
+        .delta_time = sapp.frameDuration(),
+        .dpi_scale = sapp.dpiScale(),
+    });
+    sappimgui.trackFrame();
+
     // const dt: f32 = @floatCast(sapp.frameDuration() * 60);
     // const aspect = sapp.widthf() / sapp.heightf();
+    
+    if (ig.igBegin("abc", null, 0))
+    {
+        _ = ig.igDragFloat2("position", &state.display.vs.position);
+        _ = ig.igColorEdit4("color", &state.display.fs.color, 0);
+        ig.igEnd();
+    }
 
     sg.beginPass(.{ .action = state.display.pass_action, .swapchain = sglue.swapchain() });
     sg.applyPipeline(state.display.pip);
     sg.applyBindings(state.display.bind);
+    sg.applyUniforms(shd.UB_vs_params, sg.asRange(&state.display.vs));
+    sg.applyUniforms(shd.UB_fs_params, sg.asRange(&state.display.fs));
     sg.draw(0, 3, 1);
+    simgui.render();
     sg.endPass();
 
     sg.commit();
 }
 
 export fn cleanup() void {
-    appimgui.shutdown();
-    imgui.shutdown();
+    sappimgui.shutdown();
+    simgui.shutdown();
     sg.shutdown();
 }
 
diff --git a/src/shaders/main.glsl b/src/shaders/main.glsl
index 48de990..4e2d4ea 100644
--- a/src/shaders/main.glsl
+++ b/src/shaders/main.glsl
@@ -4,29 +4,28 @@
 @header const m = @import("../math.zig")
 @ctype mat4 m.Mat4
 
-// shared code for all shaders
-@block uniforms
-layout(binding=0) uniform vs_params {
-    mat4 mvp;
-};
-@end
-
 // offscreen rendering shaders
 @vs vs_offscreen
-@include_block uniforms
+layout(binding=0) uniform vs_params {
+    vec2 position;
+};
 
-in vec2 position;
+in vec2 vpos;
 
 void main() {
-    gl_Position = vec4(position, 0, 1);
+    gl_Position = vec4(vpos + position, 0, 1);
 }
 @end
 
 @fs fs_offscreen
+layout(binding=1) uniform fs_params {
+    vec4 color;
+};
+
 out vec4 frag_color;
 
 void main() {
-    frag_color = vec4(1.0, 0.5, 1.0, 1.0);
+    frag_color = color;
 }
 @end
 
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