Adds fragment shader PBR resolve

It allows to have PBR for devices without properly detected compute
shaders.

binaries/data/mods/mod/shaders/effects/resolve_pbr.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<effect>
+	<technique>
+		<require shaders="glsl"/>
+		<require shaders="spirv"/>
+		<pass shader="resolve_pbr">
+			<depth test="FALSE" mask="false"/>
+		</pass>
+	</technique>
+</effect>

binaries/data/mods/mod/shaders/glsl/common/tone_mapper.h

@@ -0,0 +1,12 @@
+#ifndef INCLUDED_COMMON_TONE_MAPPING
+#define INCLUDED_COMMON_TONE_MAPPING
+
+vec3 applyTonemapper(vec3 color)
+{
+	float whitePoint = 10.0;
+	// Extendend Reinhard:
+	// https://www-old.cs.utah.edu/docs/techreports/2002/pdf/UUCS-02-001.pdf
+	return color * (vec3(1.0) + color / (whitePoint * whitePoint)) / (vec3(1.0) + color);
+}
+
+#endif // INCLUDED_COMMON_TONE_MAPPING

binaries/data/mods/mod/shaders/glsl/compute_resolve_pbr.cs

@@ -1,6 +1,7 @@
 #version 430
 
 #include "common/compute.h"
+#include "common/tone_mapper.h"
 
 BEGIN_DRAW_TEXTURES
 	TEXTURE_2D(0, inTex)
@@ -14,14 +15,6 @@ END_DRAW_UNIFORMS
 
 STORAGE_2D(0, rgba8, outTex);
 
-vec3 applyTonemapper(vec3 color)
-{
-	float whitePoint = 10.0;
-	// Extendend Reinhard:
-	// https://www-old.cs.utah.edu/docs/techreports/2002/pdf/UUCS-02-001.pdf
-	return color * (vec3(1.0) + color / (whitePoint * whitePoint)) / (vec3(1.0) + color);
-}
-
 layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
 void main()
 {

binaries/data/mods/mod/shaders/glsl/resolve_pbr.fs

@@ -0,0 +1,23 @@
+#version 120
+
+#include "common/fragment.h"
+#include "common/stage.h"
+#include "common/tone_mapper.h"
+
+BEGIN_DRAW_TEXTURES
+	TEXTURE_2D(0, inTex)
+END_DRAW_TEXTURES
+
+BEGIN_DRAW_UNIFORMS
+	// Premultiplied exposure, already contains 2^exposure.
+	UNIFORM(float, exposure)
+END_DRAW_UNIFORMS
+
+VERTEX_OUTPUT(0, vec2, v_tex);
+
+void main()
+{
+	vec3 hdrColor = SAMPLE_2D(GET_DRAW_TEXTURE_2D(inTex), v_tex).rgb;
+	vec3 sdrColor = applyTonemapper(hdrColor * exposure);
+	OUTPUT_FRAGMENT_SINGLE_COLOR(vec4(sdrColor, 1.0));
+}

binaries/data/mods/mod/shaders/glsl/resolve_pbr.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<program type="glsl">
+	<vertex file="glsl/simple.vs">
+		<stream name="pos" attribute="a_vertex"/>
+		<stream name="uv0" attribute="a_uv0"/>
+	</vertex>
+
+	<fragment file="glsl/resolve_pbr.fs"/>
+</program>