add test shader for issue #109

test/issue_109.glsl

@@ -0,0 +1,36 @@
+@ctype mat4 hmm_mat4
+
+@vs vs
+uniform vs_params {
+    mat4 mvp;
+};
+
+in vec4 pos;
+in vec2 texcoord0;
+
+out vec2 uv;
+
+void main() {
+    gl_Position = mvp * pos;
+    uv = texcoord0 * 5.0;
+}
+@end
+
+@fs fs
+uniform texture2D u_atlas_texture;
+uniform texture2D u_atlas_outline;
+uniform sampler u_atlas_sampler;
+
+in vec2 uv;
+out vec4 frag_color;
+
+void main() {
+  vec2 atlas_size = vec2(textureSize(sampler2D(u_atlas_texture, u_atlas_sampler), 0));
+  vec2 v_texture_coord = uv / atlas_size;
+  vec4 fill = texture(sampler2D(u_atlas_texture, u_atlas_sampler), v_texture_coord);
+  vec4 outline = texture(sampler2D(u_atlas_outline, u_atlas_sampler), v_texture_coord);
+  frag_color = fill + outline * (1.0 - fill.a);
+}
+@end
+
+@program texcube vs fs