Hacky program link debug info

- Log which gl ids are assigned to different programs
 - Log name and basic state information

changelog.txt

@@ -7,6 +7,9 @@ Technical/API
  - Deprecate instance registration functions in favor of builders
  - Refactor breaking overlay renderer to be cleaner and more contained
  - Move per-world material managers out of WorldContext into InstancedRenderDispatcher
+ - Add helper for getting information about texture atlases
+ - Add more debug information for shader loading
+ - Delete shaders after they're linked to programs
 
 0.1.0:
 Fixes

src/main/java/com/jozufozu/flywheel/backend/ShaderContext.java

@@ -44,7 +44,16 @@ public abstract class ShaderContext<P extends GlProgram> implements IShaderConte
 			fragmentFile.defineAll(state.getDefines());
 		}
 
-		return link(buildProgram(spec.name, vertexFile, fragmentFile));
+		Program linked = link(buildProgram(spec.name, vertexFile, fragmentFile));
+
+		String descriptor = linked.program + ": " + spec.name;
+
+		if (state != null)
+			descriptor += "#" + state;
+
+		Backend.log.debug(descriptor);
+
+		return linked;
 	}
 
 	protected Shader getSource(ShaderType type, ResourceLocation name) {
@@ -52,7 +61,7 @@ public abstract class ShaderContext<P extends GlProgram> implements IShaderConte
 	}
 
 	protected Program link(Program program) {
-		return program.link();
+		return program.link().deleteLinkedShaders();
 	}
 
 	@Override

src/main/java/com/jozufozu/flywheel/backend/loading/Program.java

@@ -11,11 +11,16 @@ import static org.lwjgl.opengl.GL20.glLinkProgram;
 
 import java.util.EnumMap;
 import java.util.Map;
+import java.util.function.IntConsumer;
+
+import org.lwjgl.opengl.GL20;
 
 import com.jozufozu.flywheel.backend.Backend;
 import com.jozufozu.flywheel.backend.gl.shader.GlShader;
 import com.jozufozu.flywheel.backend.gl.shader.ShaderType;
 
+import it.unimi.dsi.fastutil.ints.IntArrayList;
+import it.unimi.dsi.fastutil.ints.IntList;
 import net.minecraft.util.ResourceLocation;
 
 public class Program {
@@ -26,10 +31,13 @@ public class Program {
 
 	public final Map<ShaderType, Shader> attached;
 
+	private final IntList shaders;
+
 	public Program(ResourceLocation name) {
 		this.name = name;
 		this.program = glCreateProgram();
 		attached = new EnumMap<>(ShaderType.class);
+		shaders = new IntArrayList(2);
 	}
 
 	public Program attachShader(Shader shader, GlShader glShader) {
@@ -66,4 +74,9 @@ public class Program {
 
 		return this;
 	}
+
+	public Program deleteLinkedShaders() {
+		shaders.forEach((IntConsumer) GL20::glDeleteShader);
+		return this;
+	}
 }

src/main/java/com/jozufozu/flywheel/core/shader/spec/ProgramState.java

@@ -2,6 +2,7 @@ package com.jozufozu.flywheel.core.shader.spec;
 
 import java.util.Collections;
 import java.util.List;
+import java.util.stream.Collectors;
 
 import com.jozufozu.flywheel.core.shader.extension.IProgramExtension;
 import com.jozufozu.flywheel.util.CodecUtil;
@@ -55,4 +56,9 @@ public class ProgramState {
 	public List<IProgramExtension> getExtensions() {
 		return extensions;
 	}
+
+	@Override
+	public String toString() {
+		return "ProgramState{" + "gameState=" + context.getID() + ", defines=" + defines + ", extensions=" + extensions.stream().map(IProgramExtension::getID).collect(Collectors.toList()) + '}';
+	}
 }