border radius for quads

shaders/font.frag

@@ -1,11 +1,11 @@
 #version 330 core
-in vec2 TexCoords;
+in vec2 v_TexCoords;
 out vec4 FragColor;
 
 uniform sampler2D text;
 uniform vec4 textColor;
 
 void main() {
-  vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, TexCoords).r);
+  vec4 sampled = vec4(1.0, 1.0, 1.0, texture(text, v_TexCoords).r);
   FragColor = textColor * sampled;
 }

shaders/font.vert

@@ -1,11 +0,0 @@
-#version 330 core
-layout (location = 0) in vec4 vertex;
-
-out vec2 TexCoords;
-uniform mat4 projection;
-uniform mat4 model;
-
-void main() {
-  gl_Position = projection * model * vec4(vertex.xy, 0.0, 1.0);
-  TexCoords = vertex.zw;
-}

shaders/ui.frag

@@ -1,9 +1,33 @@
 #version 330 core
 
-in vec2 texCoords;
+in vec2 v_TexCoords;
 out vec4 FragColor;
+
 uniform vec4 aColor;
+uniform float borderRadius;
+uniform float uiWidth;
+uniform float uiHeight;
+
+const float smoothness = 1.0;
 
 void main() {
-  FragColor = vec4(aColor);
+  float alpha = aColor.a;
+
+  if (borderRadius > 0.0) {
+    vec2 dimensions = v_TexCoords * vec2(uiWidth, uiHeight);
+    float xMax = uiWidth - borderRadius;
+    float yMax = uiHeight - borderRadius;
+
+    if (dimensions.x < borderRadius && dimensions.y < borderRadius) {
+      alpha *= 1.0 - smoothstep(borderRadius - smoothness, borderRadius + smoothness, length(dimensions - vec2(borderRadius)));
+    } else if (dimensions.x < borderRadius && dimensions.y > yMax) {
+      alpha *= 1.0 - smoothstep(borderRadius - smoothness, borderRadius + smoothness, length(dimensions - vec2(borderRadius, yMax)));
+    } else if (dimensions.x > xMax && dimensions.y < borderRadius) {
+      alpha *= 1.0 - smoothstep(borderRadius - smoothness, borderRadius + smoothness, length(dimensions - vec2(xMax, borderRadius)));
+    } else if (dimensions.x > xMax && dimensions.y > yMax) {
+      alpha *= 1.0 - smoothstep(borderRadius - smoothness, borderRadius + smoothness, length(dimensions - vec2(xMax, yMax)));
+    }
+  }
+
+  FragColor = vec4(aColor.rgb, alpha);
 }

shaders/ui.vert

@@ -1,11 +1,11 @@
 #version 330 core
-layout (location = 0) in vec3 aPos;
-layout (location = 1) in vec2 aTexCoords;
-out vec2 texCoords;
+layout (location = 0) in vec4 vertex;
 
+out vec2 v_TexCoords;
 uniform mat4 projection;
+uniform mat4 model;
 
 void main() {
-  gl_Position = projection * vec4(aPos, 1.0f);
-  texCoords = aTexCoords;
+  gl_Position = projection * model * vec4(vertex.xy, 0.0, 1.0);
+  v_TexCoords = vertex.zw;
 }