Changed draw.odin, removed DearImgui

draw/shaders/solid_capsule.vs

@@ -0,0 +1,44 @@
+// SPDX-FileCopyrightText: 2024 Erin Catto
+// SPDX-License-Identifier: MIT
+
+#version 330
+
+uniform mat4 projectionMatrix;
+uniform float pixelScale;
+
+layout(location=0) in vec2 v_localPosition;
+layout(location=1) in vec4 v_instanceTransform;
+layout(location=2) in float v_instanceRadius;
+layout(location=3) in float v_instanceLength;
+layout(location=4) in vec4 v_instanceColor;
+
+out vec2 f_position;
+out vec4 f_color;
+out float f_length;
+out float f_thickness;
+
+void main()
+{
+    f_position = v_localPosition;
+    f_color = v_instanceColor;
+    
+    float radius = v_instanceRadius;
+    float length = v_instanceLength;
+    
+    // scale quad large enough to hold capsule
+    float scale = radius + 0.5 * length;
+    
+    // quad range of [-1, 1] implies normalize radius and length
+    f_length = length / scale;
+    
+    // resolution.y = pixelScale * scale
+    f_thickness = 3.0f / (pixelScale * scale);
+    
+    float x = v_instanceTransform.x;
+    float y = v_instanceTransform.y;
+    float c = v_instanceTransform.z;
+    float s = v_instanceTransform.w;
+    vec2 p = vec2(scale * v_localPosition.x, scale * v_localPosition.y);
+    p = vec2((c * p.x - s * p.y) + x, (s * p.x + c * p.y) + y);
+    gl_Position = projectionMatrix * vec4(p, 0.0, 1.0);
+}