#flwbuiltins and oh so much less overhead

- Put a lot of the reusable code in a sort of standard library
 - Need to evaluate just how much should be lumped in there
 - Still need to allow for users to create alternate contexts for the builtins
 - Normal world and contraptions are still hardcoded contexts

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

@@ -46,7 +46,8 @@ public class ShaderLoader {
 
 	// #flwinclude <"valid_namespace:valid/path_to_file.glsl">
 	private static final Pattern includePattern = Pattern.compile("#flwinclude <\"([\\w\\d_]+:[\\w\\d_./]+)\">");
-	private static boolean debugDumpFile = false;
+	private static final Pattern builtinPattern = Pattern.compile("#flwbuiltins");
+	private static boolean debugDumpFile = true;
 
 	final Map<ResourceLocation, String> shaderSource = new HashMap<>();
 
@@ -64,6 +65,9 @@ public class ShaderLoader {
 				Backend.registry.values().forEach(this::loadProgramFromSpec);
 
 				Backend.log.info("Loaded all shader programs.");
+
+				// no need to hog all that memory
+				shaderSource.clear();
 			}
 		}
 	}
@@ -125,7 +129,54 @@ public class ShaderLoader {
 		}
 	}
 
-	private String processIncludes(ResourceLocation baseName, String source) {
+	public GlShader loadShader(ResourceLocation name, ShaderType type, ShaderConstants defines) {
+		String source = shaderSource.get(name);
+
+		source = expandBuiltins(source, type);
+		source = processIncludes(source, name);
+
+		if (defines != null)
+			source = defines.process(source);
+
+		if (debugDumpFile) {
+			Backend.log.debug("Finished processing '" + name + "':");
+			int i = 1;
+			for (String s : source.split("\n")) {
+				Backend.log.debug(String.format("%1$4s: ", i++) + s);
+			}
+		}
+
+		return new GlShader(type, name, source);
+	}
+
+	private String expandBuiltins(String source, ShaderType type) {
+		return lines(source).flatMap(line -> {
+			Matcher matcher = builtinPattern.matcher(line);
+
+			if (matcher.find()) {
+				ResourceLocation builtins;
+
+				switch (type) {
+					case FRAGMENT:
+						builtins = new ResourceLocation("create", "std/builtin.frag");
+						break;
+					case VERTEX:
+						builtins = new ResourceLocation("create", "std/builtin.vert");
+						break;
+					default:
+						builtins = null;
+				}
+
+				String includeSource = shaderSource.get(builtins);
+
+				return lines(includeSource);
+			}
+
+			return Stream.of(line);
+		}).collect(Collectors.joining("\n"));
+	}
+
+	private String processIncludes(String source, ResourceLocation baseName) {
 		HashSet<ResourceLocation> seen = new HashSet<>();
 		seen.add(baseName);
 
@@ -133,7 +184,7 @@ public class ShaderLoader {
 	}
 
 	private Stream<String> includeRecursive(String source, Set<ResourceLocation> seen) {
-		return new BufferedReader(new StringReader(source)).lines().flatMap(line -> {
+		return lines(source).flatMap(line -> {
 
 			Matcher matcher = includePattern.matcher(line);
 
@@ -155,23 +206,8 @@ public class ShaderLoader {
 		});
 	}
 
-	public GlShader loadShader(ResourceLocation name, ShaderType type, ShaderConstants defines) {
-		String source = shaderSource.get(name);
-
-		source = processIncludes(name, source);
-
-		if (defines != null)
-			source = defines.process(source);
-
-		if (debugDumpFile) {
-			Backend.log.debug("Finished processing '" + name + "':");
-			int i = 1;
-			for (String s : source.split("\n")) {
-				Backend.log.debug(String.format("%1$4s: ", i++) + s);
-			}
-		}
-
-		return new GlShader(type, name, source);
+	public static Stream<String> lines(String s) {
+		return new BufferedReader(new StringReader(s)).lines();
 	}
 
 	public String readToString(InputStream is) {

src/main/java/com/jozufozu/flywheel/backend/gl/shader/GlProgram.java

@@ -105,13 +105,7 @@ public abstract class GlProgram extends GlObject {
 		}
 
 		/**
-		 * Links the attached shaders to this program and returns a user-defined container which wraps the shader
-		 * program. This container can, for example, provide methods for updating the specific uniforms of that shader
-		 * set.
-		 *
-		 * @param factory The factory which will create the shader program's container
-		 * @param <P>     The type which should be instantiated with the new program's handle
-		 * @return An instantiated shader container as provided by the factory
+		 * Links the attached shaders to this program.
 		 */
 		public Builder link() {
 			GL20.glLinkProgram(this.program);

src/main/resources/assets/create/flywheel/shaders/belt.vert

@@ -1,6 +1,7 @@
 #version 110
 #define PI 3.1415926538
 
+#flwbuiltins
 #flwinclude <"create:core/quaternion.glsl">
 #flwinclude <"create:core/matutils.glsl">
 #flwinclude <"create:core/diffuse.glsl">
@@ -30,16 +31,6 @@ uniform int uDebug;
 
 uniform vec3 uCameraPos;
 
-#if defined(USE_FOG)
-varying float FragDistance;
-#endif
-
-#ifdef CONTRAPTION
-#flwinclude <"create:contraption/builtin.vert">
-#else
-#flwinclude <"create:std/builtin.vert">
-#endif
-
 void main() {
     vec3 rotated = rotateVertexByQuat(aPos - .5, aInstanceRot) + aInstancePos + .5;
 
@@ -47,7 +38,7 @@ void main() {
 
     vec3 norm = rotateVertexByQuat(aNormal, aInstanceRot);
 
-    FLWFinalizeWorldPos(worldPos);
+    FLWFinalizeWorldPos(worldPos, uCameraPos);
     FLWFinalizeNormal(norm);
 
     float scrollSize = aScrollTexture.w - aScrollTexture.y;

src/main/resources/assets/create/flywheel/shaders/block.frag

@@ -1,5 +1,7 @@
 #version 110
 
+#flwbuiltins
+
 varying vec2 TexCoords;
 varying vec2 Light;
 varying float Diffuse;
@@ -8,45 +10,12 @@ varying vec4 Color;
 uniform sampler2D uBlockAtlas;
 uniform sampler2D uLightMap;
 
-#if defined(USE_FOG)
-varying float FragDistance;
-uniform vec4 uFogColor;
-#endif
-
-#if defined(USE_FOG_LINEAR)
-uniform vec2 uFogRange;
-
-float fogFactor() {
-    return (uFogRange.y - FragDistance) / (uFogRange.y - uFogRange.x);
-}
-#endif
-
-#ifdef USE_FOG_EXP2
-uniform float uFogDensity;
-
-float fogFactor() {
-    float dist = FragDistance * uFogDensity;
-    return 1. / exp2(dist * dist);
-}
-    #endif
-
-    #ifdef CONTRAPTION
-    #flwinclude <"create:contraption/builtin.frag">
-    #else
-    #flwinclude <"create:std/builtin.frag">
-    #endif
-
 void main() {
     vec4 tex = texture2D(uBlockAtlas, TexCoords);
 
     vec4 color = vec4(tex.rgb * FLWLight(Light, uLightMap).rgb * Diffuse, tex.a) * Color;
 
-    #if defined(USE_FOG)
-    float fog = clamp(fogFactor(), 0., 1.);
+    FLWFinalizeColor(color);
 
-    gl_FragColor = mix(uFogColor, color, fog);
-    gl_FragColor.a = color.a;
-#else
     gl_FragColor = color;
-#endif
 }

src/main/resources/assets/create/flywheel/shaders/contraption/builtin.frag

@@ -1,6 +1,16 @@
 varying vec3 BoxCoord;
 uniform sampler3D uLightVolume;
 
+void FLWFinalizeColor(vec4 color) {
+    #if defined(USE_FOG)
+    float a = color.a;
+    float fog = clamp(FLWFogFactor(), 0., 1.);
+
+    color = mix(uFogColor, color, fog);
+    color.a = a;
+    #endif
+}
+
 vec4 FLWLight(vec2 lightCoords, sampler2D lightMap) {
     vec2 lm = max(lightCoords, texture3D(uLightVolume, BoxCoord).rg);
     return texture2D(lightMap, lm * 0.9375 + 0.03125);

src/main/resources/assets/create/flywheel/shaders/contraption/builtin.vert

@@ -1,20 +1,28 @@
+#if defined(USE_FOG)
+varying float FragDistance;
+#endif
+
 varying vec3 BoxCoord;
 
 uniform vec3 uLightBoxSize;
 uniform vec3 uLightBoxMin;
 uniform mat4 uModel;
 
-void FLWFinalizeWorldPos(inout vec4 worldPos) {
+void FLWFinalizeWorldPos(inout vec4 worldPos, vec3 cameraPos) {
     worldPos = uModel * worldPos;
 
     BoxCoord = (worldPos.xyz - uLightBoxMin) / uLightBoxSize;
-    #if defined(USE_FOG)
 
+    #if defined(USE_FOG)
     FragDistance = length(worldPos.xyz);
     #endif
 }
 
 void FLWFinalizeNormal(inout vec3 normal) {
-    normal = modelToNormal(uModel) * normal;
+    mat3 m;
+    m[0] = uModel[0].xyz;
+    m[1] = uModel[1].xyz;
+    m[2] = uModel[2].xyz;
+    normal = m * normal;
 }
 

src/main/resources/assets/create/flywheel/shaders/contraption_actor.vert

@@ -19,7 +19,6 @@ attribute vec4 aInstanceRot;
 attribute vec3 aRotationCenter;
 attribute float aSpeed;
 
-
 varying float Diffuse;
 varying vec2 TexCoords;
 varying vec4 Color;

src/main/resources/assets/create/flywheel/shaders/core/matutils.glsl

@@ -1,17 +1,4 @@
 
-//mat4 rotate(vec3 axis, float angle) {
-//    float s = sin(angle);
-//    float c = cos(angle);
-//    float oc = 1. - c;
-//
-//    return mat4(
-//    oc * axis.x * axis.x + c,           oc * axis.x * axis.y - axis.z * s,  oc * axis.z * axis.x + axis.y * s,  0.,
-//    oc * axis.x * axis.y + axis.z * s,  oc * axis.y * axis.y + c,           oc * axis.y * axis.z - axis.x * s,  0.,
-//    oc * axis.z * axis.x - axis.y * s,  oc * axis.y * axis.z + axis.x * s,  oc * axis.z * axis.z + c,           0.,
-//    0.,                                 0.,                                 0.,                                 1.
-//    );
-//}
-
 mat4 rotate(vec3 axis, float angle) {
     float s = sin(angle);
     float c = cos(angle);

src/main/resources/assets/create/flywheel/shaders/flap.vert

@@ -1,6 +1,7 @@
 #version 110
 #define PI 3.1415926538
 
+#flwbuiltins
 #flwinclude <"create:core/matutils.glsl">
 #flwinclude <"create:core/quaternion.glsl">
 #flwinclude <"create:core/diffuse.glsl">
@@ -32,16 +33,6 @@ uniform int uDebug;
 
 uniform vec3 uCameraPos;
 
-#if defined(USE_FOG)
-varying float FragDistance;
-#endif
-
-#ifdef CONTRAPTION
-#flwinclude <"create:contraption/builtin.vert">
-#else
-#flwinclude <"create:std/builtin.vert">
-#endif
-
 float toRad(float degrees) {
     return fract(degrees / 360.) * PI * 2.;
 }
@@ -71,7 +62,7 @@ void main() {
     vec4 worldPos = vec4(rotated, 1.);
     vec3 norm = rotateVertexByQuat(rotateVertexByQuat(aNormal, flapRotation), orientation);
 
-    FLWFinalizeWorldPos(worldPos);
+    FLWFinalizeWorldPos(worldPos, uCameraPos);
     FLWFinalizeNormal(norm);
 
     Diffuse = diffuse(norm);

src/main/resources/assets/create/flywheel/shaders/model.vert

@@ -1,5 +1,6 @@
 #version 110
 
+#flwbuiltins
 #flwinclude <"create:core/matutils.glsl">
 #flwinclude <"create:core/diffuse.glsl">
 
@@ -23,24 +24,13 @@ uniform int uDebug;
 
 uniform vec3 uCameraPos;
 
-#if defined(USE_FOG)
-varying float FragDistance;
-#endif
-
-#ifdef CONTRAPTION
-#flwinclude <"create:contraption/builtin.vert">
-#else
-#flwinclude <"create:std/builtin.vert">
-#endif
-
-
 void main() {
     vec4 worldPos = aTransform * vec4(aPos, 1.);
 
     vec3 norm = aNormalMat * aNormal;
 
+    FLWFinalizeWorldPos(worldPos, uCameraPos);
     FLWFinalizeNormal(norm);
-    FLWFinalizeWorldPos(worldPos);
 
     norm = normalize(norm);
 

src/main/resources/assets/create/flywheel/shaders/oriented.vert

@@ -1,5 +1,6 @@
 #version 110
 
+#flwbuiltins
 #flwinclude <"create:core/matutils.glsl">
 #flwinclude <"create:core/quaternion.glsl">
 #flwinclude <"create:core/diffuse.glsl">
@@ -25,22 +26,12 @@ uniform int uDebug;
 
 uniform vec3 uCameraPos;
 
-#if defined(USE_FOG)
-varying float FragDistance;
-#endif
-
-#ifdef CONTRAPTION
-#flwinclude <"create:contraption/builtin.vert">
-#else
-#flwinclude <"create:std/builtin.vert">
-#endif
-
 void main() {
     vec4 worldPos = vec4(rotateVertexByQuat(aPos - aPivot, aRotation) + aPivot + aInstancePos, 1.);
 
     vec3 norm = rotateVertexByQuat(aNormal, aRotation);
 
-    FLWFinalizeWorldPos(worldPos);
+    FLWFinalizeWorldPos(worldPos, uCameraPos);
     FLWFinalizeNormal(norm);
 
     Diffuse = diffuse(norm);

src/main/resources/assets/create/flywheel/shaders/rotating.vert

@@ -1,6 +1,7 @@
 #version 110
 #define PI 3.1415926538
 
+#flwbuiltins
 #flwinclude <"create:core/quaternion.glsl">
 #flwinclude <"create:core/matutils.glsl">
 #flwinclude <"create:core/diffuse.glsl">
@@ -27,16 +28,6 @@ uniform int uDebug;
 
 uniform vec3 uCameraPos;
 
-#if defined(USE_FOG)
-varying float FragDistance;
-#endif
-
-#ifdef CONTRAPTION
-#flwinclude <"create:contraption/builtin.vert">
-#else
-#flwinclude <"create:std/builtin.vert">
-#endif
-
 mat4 kineticRotation() {
     float degrees = aOffset + uTime * aSpeed * 3./10.;
     float angle = fract(degrees / 360.) * PI * 2.;
@@ -50,7 +41,7 @@ void main() {
 
     vec3 norm = modelToNormal(kineticRotation) * aNormal;
 
-    FLWFinalizeWorldPos(worldPos);
+    FLWFinalizeWorldPos(worldPos, uCameraPos);
     FLWFinalizeNormal(norm);
 
     Diffuse = diffuse(norm);

src/main/resources/assets/create/flywheel/shaders/std/builtin.frag

@@ -1,4 +1,21 @@
+#flwinclude <"create:std/fog.glsl">
+
+#if defined(CONTRAPTION)
+#flwinclude <"create:contraption/builtin.frag">
+#else
+
+void FLWFinalizeColor(vec4 color) {
+    #if defined(USE_FOG)
+    float a = color.a;
+    float fog = clamp(FLWFogFactor(), 0., 1.);
+
+    color = mix(uFogColor, color, fog);
+    color.a = a;
+    #endif
+}
+
 vec4 FLWLight(vec2 lightCoords, sampler2D lightMap) {
     vec2 lm = lightCoords * 0.9375 + 0.03125;
     return texture2D(lightMap, lm);
 }
+    #endif

src/main/resources/assets/create/flywheel/shaders/std/builtin.vert

@@ -1,10 +1,18 @@
-void FLWFinalizeWorldPos(inout vec4 worldPos) {
-    #if defined(USE_FOG)
+#if defined(CONTRAPTION)
+#flwinclude <"create:contraption/builtin.vert">
+#else
 
-    FragDistance = length(worldPos.xyz - uCameraPos);
+#if defined(USE_FOG)
+varying float FragDistance;
+#endif
+
+void FLWFinalizeWorldPos(inout vec4 worldPos, vec3 cameraPos) {
+    #if defined(USE_FOG)
+    FragDistance = length(worldPos.xyz - cameraPos);
     #endif
 }
 
 void FLWFinalizeNormal(inout vec3 normal) {
     // noop
 }
+    #endif

src/main/resources/assets/create/flywheel/shaders/std/fog.glsl

@@ -0,0 +1,23 @@
+#if defined(USE_FOG)
+varying float FragDistance;
+uniform vec4 uFogColor;
+#endif
+
+#if defined(USE_FOG_LINEAR)
+uniform vec2 uFogRange;
+
+float FLWFogFactor() {
+    return (uFogRange.y - FragDistance) / (uFogRange.y - uFogRange.x);
+}
+    #elif defined(USE_FOG_EXP2)
+uniform float uFogDensity;
+
+float FLWFogFactor() {
+    float dist = FragDistance * uFogDensity;
+    return 1. / exp2(dist * dist);
+}
+    #else
+float FLWFogFactor() {
+    return 0.;
+}
+    #endif