Initial commit

Inverter/shaders/final.fsh

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+#version 120
+
+varying vec4 texcoord;
+uniform sampler2D gcolor;
+
+void main() {
+	// Get the location of the current pixel on the screen.
+	// point.x ranges from 0 on the left to 1 on the right.
+	// point.y ranges from 0 at the top to 1 at the bottom.
+	// Change the numbers to grab values from other parts of the screen.
+	vec2 point = texcoord.st;
+
+	// Get the color of the pixel pointed to by the point variable.
+	// color.r is red, color.g is green, color.b is blue, all values from 0 to 1.
+	vec3 color = texture2D(gcolor, point).rgb;
+
+	// You can do whatever you want to the color. Here we're inverting it.
+	color.r = 1 - color.r;
+	color.g = 1 - color.g;
+	color.b = 1 - color.b;
+
+	// Here's where we tell Minecraft what color we want this pixel.
+	gl_FragColor = vec4(color, 1.0);
+}

Inverter/shaders/final.vsh

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+#version 120
+
+varying vec4 texcoord;
+
+void main() {
+	// Here we're just setting up things we'll need in final.fsh
+	gl_Position = ftransform();
+	texcoord = gl_MultiTexCoord0;
+}

README.md

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+# Simple Minecraft Shaders
+
+If you want to play with shaders in Minecraft, here's the simplest possible shader to get started with, along with some hints on how to make your own.
+
+## Installing
+
+You'll need the shaders mod, but then you can take the `Inverter` folder and drop it in the `shaderpacks` folder in your Minecraft resources folder.
+
+## Coding
+
+Take a look at `Inverter/shaders/final.fsh` and play around!