Don't depend on reflection to OpenGL, use custom enum

src/main/java/net/coderbot/iris/gl/blending/BlendModeFunction.java

@@ -0,0 +1,39 @@
+package net.coderbot.iris.gl.blending;
+
+import java.util.Optional;
+
+import net.coderbot.iris.Iris;
+import org.lwjgl.opengl.GL11;
+
+public enum BlendModeFunction {
+	ZERO(GL11.GL_ZERO),
+	ONE(GL11.GL_ONE),
+	SRC_COLOR(GL11.GL_SRC_COLOR),
+	ONE_MINUS_SRC_COLOR(GL11.GL_ONE_MINUS_SRC_COLOR),
+	DST_COLOR(GL11.GL_DST_COLOR),
+	ONE_MINUS_DST_COLOR(GL11.GL_ONE_MINUS_DST_COLOR),
+	SRC_ALPHA(GL11.GL_SRC_ALPHA),
+	ONE_MINUS_SRC_ALPHA(GL11.GL_ONE_MINUS_SRC_ALPHA),
+	DST_ALPHA(GL11.GL_DST_ALPHA),
+	ONE_MINUS_DST_ALPHA(GL11.GL_ONE_MINUS_DST_ALPHA),
+	SRC_ALPHA_SATURATE(GL11.GL_SRC_ALPHA_SATURATE);
+
+	private final int glId;
+
+	BlendModeFunction(int glFormat) {
+		this.glId = glFormat;
+	}
+
+	public static Optional<BlendModeFunction> fromString(String name) {
+		try {
+			return Optional.of(BlendModeFunction.valueOf(name));
+		} catch (IllegalArgumentException e) {
+			Iris.logger.warn("Invalid blend mode! " + name);
+			return Optional.empty();
+		}
+	}
+
+	public int getGlId() {
+		return glId;
+	}
+}

src/main/java/net/coderbot/iris/shaderpack/ShaderProperties.java

@@ -1,8 +1,5 @@
 package net.coderbot.iris.shaderpack;
 
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
 import java.util.Optional;
 import java.util.Properties;
 import java.util.function.Consumer;
@@ -16,7 +13,7 @@
 import net.coderbot.iris.Iris;
 import net.coderbot.iris.gl.blending.AlphaTestFunction;
 import net.coderbot.iris.gl.blending.AlphaTestOverride;
-import org.lwjgl.opengl.GL11C;
+import net.coderbot.iris.gl.blending.BlendModeFunction;
 
 public class ShaderProperties {
 	private boolean enableClouds = true;
@@ -160,13 +157,7 @@ public ShaderProperties(Properties properties) {
 
 				int i = 0;
 				for (String modeName : modeArray) {
-					try {
-						modes[i] = (int) GL11C.class.getDeclaredField("GL_" + modeName).get(null);
-					} catch (IllegalAccessException e) {
-						Iris.logger.error("Unable to get GL constant " + modeName, e);
-					} catch (NoSuchFieldException e) {
-						Iris.logger.error("Invalid GL constant " + modeName, e);
-					}
+					modes[i] = BlendModeFunction.fromString(modeName).get().getGlId();
 					i++;
 				}
 				blendModeOverrides.put(pass, modes);