Implementation of sRGB image support. Overhauls the linearization setup to utilize the sRGB image types, as well as refactors the use of ColorF and ColorI to be properly internally consistent. ColorIs are used only for front-facing/editing/UI settings, and ColorFs, now renamed to LinearColorF to reduce confusion of purpose, are used for color info in the engine itself. This avoids confusing and expensive conversions back and forth between types and avoids botches with linearity. Majority work done by @rextimmy

Engine/source/gfx/gfxEnums.h

@@ -178,11 +178,12 @@ enum GFXFormat
 
    // 24 bit texture formats...
    GFXFormatR8G8B8,// first in group...
-
+   GFXFormatR8G8B8_SRGB,
    // 32 bit texture formats...
    GFXFormatR8G8B8A8,// first in group...
    GFXFormatR8G8B8X8,
    GFXFormatB8G8R8A8,
+   GFXFormatR8G8B8A8_SRGB,
    GFXFormatR32F,
    GFXFormatR16G16,
    GFXFormatR16G16F,
@@ -192,9 +193,6 @@ enum GFXFormat
    GFXFormatD24S8,   
    GFXFormatD24FS8,
 
-   // sRGB formats
-   GFXFormatR8G8B8A8_SRGB,
-
    // Guaranteed RGBA8 (for apis which really dont like bgr)
    GFXFormatR8G8B8A8_LINEAR_FORCE,
 
@@ -205,12 +203,16 @@ enum GFXFormat
    // 128 bit texture formats...
    GFXFormatR32G32B32A32F,// first in group...
 
-   // unknown size...
-   GFXFormatDXT1,// first in group...
-   GFXFormatDXT2,
-   GFXFormatDXT3,
-   GFXFormatDXT4,
-   GFXFormatDXT5,
+   // unknown size...Block compression
+   GFXFormatBC1,  //dxt1
+   GFXFormatBC2,  //dxt2/3
+   GFXFormatBC3,  //dxt4/5
+   GFXFormatBC4,  //3dc+ / ati1
+   GFXFormatBC5,  //3dc / ati2
+   // compressed sRGB formats   
+   GFXFormatBC1_SRGB,
+   GFXFormatBC2_SRGB,
+   GFXFormatBC3_SRGB,
 
    GFXFormat_COUNT,
 
@@ -220,7 +222,7 @@ enum GFXFormat
    GFXFormat_32BIT = GFXFormatR8G8B8A8,
    GFXFormat_64BIT = GFXFormatR16G16B16A16,
    GFXFormat_128BIT = GFXFormatR32G32B32A32F,
-   GFXFormat_UNKNOWNSIZE = GFXFormatDXT1,
+   GFXFormat_UNKNOWNSIZE = GFXFormatBC1
 };
 
 /// Returns the byte size of the pixel for non-compressed formats.