From 21c7c3efd04b72f32dae3dcae7fdf5c3e3fc2fc1 Mon Sep 17 00:00:00 2001
From: themancalledjakob <jakob@jrkb.land>
Date: Mon, 27 Feb 2023 16:07:46 +0100
Subject: [PATCH] gles 3 shaders

---
 .../ofxMsdfgen/shaders/simple/ES3/shader.frag | 35 +++++++++++++++++++
 .../ofxMsdfgen/shaders/simple/ES3/shader.vert | 15 ++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 data/ofxMsdfgen/shaders/simple/ES3/shader.frag
 create mode 100644 data/ofxMsdfgen/shaders/simple/ES3/shader.vert

diff --git a/data/ofxMsdfgen/shaders/simple/ES3/shader.frag b/data/ofxMsdfgen/shaders/simple/ES3/shader.frag
new file mode 100644
index 0000000..d47b6b3
--- /dev/null
+++ b/data/ofxMsdfgen/shaders/simple/ES3/shader.frag
@@ -0,0 +1,35 @@
+#version 300 es
+precision highp float;
+
+// these are our textures
+uniform sampler2D msdf;
+
+uniform vec4 fontColor;
+uniform float pxRange;
+
+// this comes from the vertex shader
+in vec2 texCoordVarying;
+out vec4 outputColor;
+
+float median(float r, float g, float b) {
+    return max(min(r, g), min(max(r, g), b));
+}
+
+float screenPxRange() {
+    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);
+}
+
+void main()
+{
+    vec4 bgColor = vec4(fontColor.rgb,0);
+    vec4 fgColor = fontColor;
+
+    vec3 msdf_rgb = texture(msdf, texCoordVarying).rgb;
+    float sd = median(msdf_rgb.r, msdf_rgb.g, msdf_rgb.b);
+    float screenPxDistance = screenPxRange()*(sd - 0.5);
+    float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
+    outputColor = mix(bgColor, fgColor, opacity);
+}
diff --git a/data/ofxMsdfgen/shaders/simple/ES3/shader.vert b/data/ofxMsdfgen/shaders/simple/ES3/shader.vert
new file mode 100644
index 0000000..9e21acc
--- /dev/null
+++ b/data/ofxMsdfgen/shaders/simple/ES3/shader.vert
@@ -0,0 +1,15 @@
+#version 300 es
+
+// whoops these are for the programmable pipeline system
+uniform mat4 modelViewProjectionMatrix;
+
+in vec4 position;
+in vec2 texcoord;
+
+out vec2 texCoordVarying;
+
+void main()
+{
+    texCoordVarying = texcoord;
+    gl_Position = modelViewProjectionMatrix * position;
+}