Create/Update assets for version 1.8

assets/minecraft/shaders/program/blit.fsh

@@ -0,0 +1,12 @@
+#version 120
+
+uniform sampler2D DiffuseSampler;
+
+uniform vec4 ColorModulate;
+
+varying vec2 texCoord;
+
+void main(){
+    vec4 outColor = texture2D(DiffuseSampler, texCoord) * ColorModulate;
+    gl_FragColor = vec4(outColor.rgb, 1.0);
+}