From: Brendan Hansen <brendan.f.hansen@gmail.com>
Date: Tue, 2 Mar 2021 22:22:17 +0000 (-0600)
Subject: testing capabilities of immediate mode
X-Git-Url: https://git.brendanfh.com/?a=commitdiff_plain;h=c83e3afda421593f6de738026563a1029de57bb9;p=onyx-imgui.git

testing capabilities of immediate mode
---

diff --git a/lib/gl/gl_utils.onyx b/lib/gl/gl_utils.onyx
index 0ad5359..34bae0e 100644
--- a/lib/gl/gl_utils.onyx
+++ b/lib/gl/gl_utils.onyx
@@ -23,16 +23,17 @@ Shader :: struct {
     }
 
     init_from_source :: (use shader: ^Shader, vertex_source: str, fragment_source: str) {
-        // @Robustness: Errors in compiling the shaders are ignored right now.
-        vertex_shader, _   := compile_shader(vertex_source,   gl.VERTEX_SHADER);
-        fragment_shader, _ := compile_shader(fragment_source, gl.FRAGMENT_SHADER);
+        vertex_shader, vertex_compiled     := compile_shader(vertex_source,   gl.VERTEX_SHADER);
+        fragment_shader, fragment_compiled := compile_shader(fragment_source, gl.FRAGMENT_SHADER);
+        assert(vertex_compiled, "Vertex shader failed to compile");
+        assert(fragment_compiled, "Fragment shader failed to compile");
         defer {
             gl.deleteShader(vertex_shader);
             gl.deleteShader(fragment_shader);
         }
 
-        // @Robustness: Errors in linking the program are ignored right now.
-        shader_program, _ := link_program(vertex_shader, fragment_shader);
+        shader_program, program_linked := link_program(vertex_shader, fragment_shader);
+        assert(program_linked, "Program failed to link");
         program = shader_program;
 
         position_loc   = gl.getAttribLocation(program, "a_position");
diff --git a/lib/immediate_renderer.onyx b/lib/immediate_renderer.onyx
index 5551edb..67aa113 100644
--- a/lib/immediate_renderer.onyx
+++ b/lib/immediate_renderer.onyx
@@ -12,7 +12,8 @@ Vector2 :: struct {
 }
 
 Color4 :: struct {
-    r, g, b, a: f32;
+    r, g, b: f32;
+    a: f32 = 1;
 }
 
 Immediate_Vertex :: struct {
@@ -115,16 +116,18 @@ Immediate_Renderer :: struct {
         },
 
         (use ir: ^Immediate_Renderer, position: Vector2, color: Color4) {
+            if vertex_count >= verticies.count do ir->flush();
+
             vertex_ptr := ^verticies[vertex_count];
             defer vertex_count += 1;
 
             vertex_ptr.position = position;
             vertex_ptr.color = color;
-            vertex_ptr.texture = Vector2.{ 0, 0 };
+            vertex_ptr.texture = .{ 0, 0 };
         },
     }
 
-    quad :: (use ir: ^Immediate_Renderer, position: Vector2, size: Vector2, color: Color4 = .{1,1,1,1}) {
+    quad :: (use ir: ^Immediate_Renderer, position: Vector2, size: Vector2, color: Color4 = .{1,1,1}) {
         push_vertex(ir, .{ position.x,          position.y          }, color);
         push_vertex(ir, .{ position.x + size.x, position.y          });
         push_vertex(ir, .{ position.x + size.x, position.y + size.y });
@@ -160,7 +163,7 @@ immediate_vertex :: proc {
     (position: Vector2, color: Color4) { immediate_renderer->push_vertex(position, color); },
 }
 
-immediate_quad :: (position: Vector2, size: Vector2, color: Color4 = .{1,1,1,1}) {
+immediate_quad :: (position: Vector2, size: Vector2, color: Color4 = .{1,1,1}) {
     immediate_renderer->quad(position, size, color);
 }
 
diff --git a/test/basic.onyx b/test/basic.onyx
index 06a62f9..786bd92 100644
--- a/test/basic.onyx
+++ b/test/basic.onyx
@@ -12,8 +12,21 @@ init :: () {
 
     gl.init("imgui-canvas"); 
     imgui.immediate_renderer_init();
+
+    array.init(^squares);
+}
+
+width  := 0
+height := 0
+
+squares : [..] struct {
+    x, y : f32;
+    size : f32 = 0.05f;
+
+    color: imgui.Color4 = .{1,0,0};
 }
 
+
 poll_events :: () {
     use events.DomEventKind;
 
@@ -22,13 +35,20 @@ poll_events :: () {
         case Resize {
             println("The window was resized!");
 
+            width  = event.resize.width;
+            height = event.resize.height;
+
             gl.setSize(event.resize.width, event.resize.height);
             gl.viewport(0, 0, event.resize.width, event.resize.height);
         }
 
         case MouseDown {
-            println("The mouse was pressed!");
-            printf("Specifically, the %i button.\n", event.mouse.button);
+            if event.mouse.button == ~~0 {
+                array.push(^squares, .{
+                    x = (cast(f32) event.mouse.pos_x / ~~width),
+                    y = (cast(f32) event.mouse.pos_y / ~~height),
+                });
+            }
         }
     }
 }
@@ -37,6 +57,10 @@ t := 0.0f
 
 update :: () {
     t += 1.0 / 60.0;
+
+    if random.between(0, 100) >= 90 {
+        array.push(^squares, .{ x = t / 100, y = 0, size = 0.02f, color = .{0,0,1} });
+    }
 }
 
 draw :: () {
@@ -44,22 +68,27 @@ draw :: () {
     gl.clear(gl.COLOR_BUFFER_BIT);
 
     use imgui;
-    defer immediate_flush();
 
     x := math.cos(t);
     y := math.sin(t);
 
-    immediate_vertex(.{ 0, 0 }, color=.{ 1, 1, 1, 1 });
+    immediate_vertex(.{ 0, 0 }, color=.{ 1, 1, 1 });
     immediate_vertex(.{ x, y });
     immediate_vertex(.{ -y, x });
 
     if cast(u32) t % 2 == 0 {
-        immediate_vertex(.{ 0, 0 },     color=.{ 1, 0, 0, 1 });
-        immediate_vertex(.{ -1.0f, 0 }, color=.{ 0, 1, 0, 1 });
-        immediate_vertex(.{ 0, -1.0f }, color=.{ 0, 0, 1, 1 });
+        immediate_vertex(.{ 0, 0 },     color=.{ 1, 0, 0 });
+        immediate_vertex(.{ -1.0f, 0 }, color=.{ 0, 1, 0 });
+        immediate_vertex(.{ 0, -1.0f }, color=.{ 0, 0, 1 });
+    }
+
+    immediate_quad(.{0, 0}, .{.1, .1}, .{1, 0, 1});
+
+    for ^square: squares {
+        immediate_quad(.{ square.x, square.y }, .{ square.size, square.size }, square.color);
     }
 
-    immediate_quad(.{0, 0}, .{.1, .1}, .{1, 0, 1, 1});
+    immediate_flush();
 }
 
 loop :: () -> void #export {