Scalable fonts using freetype-gl

scwx-qt/gl/text.frag

@@ -1,12 +1,17 @@
 #version 330 core
+
 in vec2 texCoords;
+in vec4 textColor;
+
 out vec4 color;
 
-uniform sampler2D text;
-uniform vec4 textColor;
+uniform sampler2D uTexture;
 
 void main()
 {
-   vec4 sampled = vec4(1.0f, 1.0f, 1.0f, texture(text, texCoords).r);
-   color        = textColor * sampled;
+   float dist  = texture(uTexture, texCoords).r;
+   float width = fwidth(dist);
+   float alpha = smoothstep(0.5f - width, 0.5f + width, dist);
+
+   color = vec4(textColor.rgb, textColor.a * alpha);
 }

scwx-qt/gl/text.vert

@@ -1,11 +1,17 @@
 #version 330 core
-layout (location = 0) in vec4 vertex;
+
+layout (location = 0) in vec3 aVertex;
+layout (location = 1) in vec2 aTexCoords;
+layout (location = 2) in vec4 aColor;
+
 out vec2 texCoords;
+out vec4 textColor;
 
 uniform mat4 projection;
 
 void main()
 {
-   gl_Position = projection * vec4(vertex.xy, 0.0f, 1.0f);
-   texCoords   = vertex.zw;
+   gl_Position = projection * vec4(aVertex, 1.0f);
+   texCoords   = aTexCoords;
+   textColor   = aColor;
 }