Create/Update assets for version 21w15a

assets/minecraft/shaders/core/block.fsh

@@ -0,0 +1,18 @@
+#version 150
+
+uniform sampler2D Sampler0;
+uniform sampler2D Sampler2;
+
+uniform vec4 ColorModulator;
+
+in vec4 vertexColor;
+in vec2 texCoord0;
+in vec2 texCoord2;
+in vec4 normal;
+
+out vec4 fragColor;
+
+void main() {
+    vec4 color = texture(Sampler0, texCoord0) * vertexColor;
+    fragColor = color * ColorModulator;
+}