From 703004f830f39adcde9b9565f1aa49d1b10e8d27 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Mon, 16 Jun 2014 10:22:26 -0300
Subject: More 3D Work -=-=-=-=-=-

-ESM Shadow Mapping for softer and less glitchy shadows
-HDR Pipeline (convert to Linear on texture import, convert to SRGB at the end)
-Fix to xml parse bug
---
 core/color.h   | 11 +++++++++++
 core/image.cpp | 39 +++++++++++++++++++++++++++++++++++++++
 core/image.h   |  1 +
 3 files changed, 51 insertions(+)

(limited to 'core')

diff --git a/core/color.h b/core/color.h
index 9b5850f56b..491c72d449 100644
--- a/core/color.h
+++ b/core/color.h
@@ -30,6 +30,7 @@
 #define COLOR_H
 
 #include "ustring.h"
+#include "math_funcs.h"
 /**
 	@author Juan Linietsky <reduzio@gmail.com>
 */
@@ -97,6 +98,16 @@ struct Color {
 		return res;
 	}
 
+	_FORCE_INLINE_ Color to_linear() const {
+
+		return Color(
+			r<0.04045 ? r * (1.0 / 12.92) : Math::pow((r + 0.055) * (1.0 / (1 + 0.055)), 2.4),
+			g<0.04045 ? g * (1.0 / 12.92) : Math::pow((g + 0.055) * (1.0 / (1 + 0.055)), 2.4),
+			b<0.04045 ? b * (1.0 / 12.92) : Math::pow((b + 0.055) * (1.0 / (1 + 0.055)), 2.4),
+			a
+		);
+	}
+
 	static Color hex(uint32_t p_hex);
 	static Color html(const String& p_color);
 	static bool html_is_valid(const String& p_color);
diff --git a/core/image.cpp b/core/image.cpp
index b577117f1e..e5489c06fa 100644
--- a/core/image.cpp
+++ b/core/image.cpp
@@ -1664,6 +1664,45 @@ void Image::set_compress_bc_func(void (*p_compress_func)(Image *)) {
 
 
 
+void Image::srgb_to_linear() {
+
+	if (data.size()==0)
+		return;
+
+	static const uint8_t srgb2lin[256]={0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 26, 26, 27, 27, 28, 29, 29, 30, 31, 31, 32, 33, 33, 34, 35, 36, 36, 37, 38, 38, 39, 40, 41, 42, 42, 43, 44, 45, 46, 47, 47, 48, 49, 50, 51, 52, 53, 54, 55, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 87, 88, 89, 90, 92, 93, 94, 95, 97, 98, 99, 101, 102, 103, 105, 106, 107, 109, 110, 112, 113, 114, 116, 117, 119, 120, 122, 123, 125, 126, 128, 129, 131, 132, 134, 135, 137, 139, 140, 142, 144, 145, 147, 148, 150, 152, 153, 155, 157, 159, 160, 162, 164, 166, 167, 169, 171, 173, 175, 176, 178, 180, 182, 184, 186, 188, 190, 192, 193, 195, 197, 199, 201, 203, 205, 207, 209, 211, 213, 215, 218, 220, 222, 224, 226, 228, 230, 232, 235, 237, 239, 241, 243, 245, 248, 250, 252};
+
+
+	ERR_FAIL_COND( format!=FORMAT_RGB && format!=FORMAT_RGBA  );
+
+	if (format==FORMAT_RGBA) {
+
+		int len = data.size()/4;
+		DVector<uint8_t>::Write wp = data.write();
+		unsigned char *data_ptr=wp.ptr();
+
+		for(int i=0;i<len;i++) {
+
+			data_ptr[(i<<2)+0]=srgb2lin[ data_ptr[(i<<2)+0] ];
+			data_ptr[(i<<2)+1]=srgb2lin[ data_ptr[(i<<2)+1] ];
+			data_ptr[(i<<2)+2]=srgb2lin[ data_ptr[(i<<2)+2] ];
+		}
+
+	} else if (format==FORMAT_RGB) {
+
+		int len = data.size()/3;
+		DVector<uint8_t>::Write wp = data.write();
+		unsigned char *data_ptr=wp.ptr();
+
+		for(int i=0;i<len;i++) {
+
+			data_ptr[(i*3)+0]=srgb2lin[ data_ptr[(i*3)+0] ];
+			data_ptr[(i*3)+1]=srgb2lin[ data_ptr[(i*3)+1] ];
+			data_ptr[(i*3)+2]=srgb2lin[ data_ptr[(i*3)+2] ];
+		}
+	}
+
+}
+
 void Image::premultiply_alpha() {
 
 	if (data.size()==0)
diff --git a/core/image.h b/core/image.h
index 87f851959c..ce189f330d 100644
--- a/core/image.h
+++ b/core/image.h
@@ -321,6 +321,7 @@ public:
 
 	void fix_alpha_edges();
 	void premultiply_alpha();
+	void srgb_to_linear();
 
 	void blit_rect(const Image& p_src, const Rect2& p_src_rect,const Point2& p_dest);
 	void brush_transfer(const Image& p_src, const Image& p_brush, const Point2& p_dest);
-- 
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