Create/Update assets for version 21w20a

assets/minecraft/shaders/core/block.vsh

@@ -0,0 +1,24 @@
+#version 150
+
+in vec3 Position;
+in vec4 Color;
+in vec2 UV0;
+in vec2 UV2;
+in vec3 Normal;
+
+uniform mat4 ModelViewMat;
+uniform mat4 ProjMat;
+
+out vec4 vertexColor;
+out vec2 texCoord0;
+out vec2 texCoord2;
+out vec4 normal;
+
+void main() {
+    gl_Position = ProjMat * ModelViewMat * vec4(Position, 1.0);
+
+    vertexColor = Color;
+    texCoord0 = UV0;
+    texCoord2 = UV2;
+    normal = ProjMat * ModelViewMat * vec4(Normal, 0.0);
+}