Update #18 - Final release, added PBR shaders

sources/resources/assets/eagler/glsl/deferred/post_tonemap.fsh

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+#line 2
+
+/*
+ * Copyright (c) 2023 LAX1DUDE. All Rights Reserved.
+ * 
+ * WITH THE EXCEPTION OF PATCH FILES, MINIFIED JAVASCRIPT, AND ALL FILES
+ * NORMALLY FOUND IN AN UNMODIFIED MINECRAFT RESOURCE PACK, YOU ARE NOT ALLOWED
+ * TO SHARE, DISTRIBUTE, OR REPURPOSE ANY FILE USED BY OR PRODUCED BY THE
+ * SOFTWARE IN THIS REPOSITORY WITHOUT PRIOR PERMISSION FROM THE PROJECT AUTHOR.
+ * 
+ * NOT FOR COMMERCIAL OR MALICIOUS USE
+ * 
+ * (please read the 'LICENSE' file this repo's root directory for more info) 
+ * 
+ */
+
+precision lowp int;
+precision highp float;
+precision highp sampler2D;
+
+in vec2 v_position2f;
+
+layout(location = 0) out vec4 output4f;
+
+uniform sampler2D u_lightingHDRFramebufferTexture;
+uniform sampler2D u_framebufferLumaAvgInput;
+uniform sampler2D u_ditherTexture;
+uniform vec3 u_exposure3f;
+uniform vec2 u_ditherScale2f;
+
+void main() {
+	float lumaHDR = textureLod(u_framebufferLumaAvgInput, vec2(0.5), 0.0).r;
+	vec3 input3f = textureLod(u_lightingHDRFramebufferTexture, v_position2f, 0.0).rgb;
+
+	input3f /= (0.1 + min(lumaHDR * 6.0, 4.0));
+
+	input3f *= u_exposure3f;
+
+	// ACES, modified to approximate gamma correction
+	const float a = 1.22;
+	const float b = 1.78;
+	const float c = 1.22;
+	const float d = 1.79;
+	const float e = 0.29;
+
+	input3f = clamp((input3f * (a * input3f + b)) / (input3f * (c * input3f + d) + e), 0.0, 1.0);
+
+	// desaturate a bit, makes it look like less of a cartoon
+	float sat = 0.8;
+	float luma = dot(input3f, vec3(0.299, 0.587, 0.114));
+	input3f = (input3f - luma) * sat + luma;
+	input3f += textureLod(u_ditherTexture, v_position2f * u_ditherScale2f, 0.0).r / 255.0;
+
+	output4f = vec4(clamp(input3f, 0.0, 1.0), luma);
+}