fix GL3 mix shaders

data/ofxMsdfgen/shaders/mix/GL3/shader.frag

@@ -1,8 +1,8 @@
-#version 150
+#version 330
 precision highp float;
 
 // these are our textures
-uniform sampler2DRect msdf;
+uniform sampler2D msdf;
 
 uniform vec4 fontColor;
 uniform vec2 unitRange;
@@ -14,8 +14,6 @@ uniform vec2 scale_b;
 
 // this comes from the vertex shader
 in vec2 texCoordVarying;
-
-// this is the output of the fragment shader
 out vec4 outputColor;
 
 float median(float r, float g, float b) {
@@ -23,7 +21,8 @@ float median(float r, float g, float b) {
 }
 
 float screenPxRange() {
-    //vec2 unitRange = vec2(pxRange)/vec2(textureSize(msdf));
+    //ivec2 ts = textureSize(msdf, 0);
+    //vec2 unitRange = vec2(pxRange)/vec2(ts);
     vec2 screenTexSize = vec2(1.0)/fwidth(texCoordVarying);
     return max(0.5*dot(unitRange, screenTexSize), 1.0);
 }

data/ofxMsdfgen/shaders/mix/GL3/shader.vert

@@ -1,4 +1,4 @@
-#version 150
+#version 330
 
 // these come from the programmable pipeline
 uniform mat4 modelViewProjectionMatrix;
@@ -6,11 +6,10 @@ uniform mat4 modelViewProjectionMatrix;
 in vec4 position;
 in vec2 texcoord;
 
-// texture coordinates are sent to fragment shader
 out vec2 texCoordVarying;
 
 void main()
 {
     texCoordVarying = texcoord;
     gl_Position = modelViewProjectionMatrix * position;
-}
+}