/usr/include/OpenLayer/Blenders.hpp is in libopenlayer-dev 2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | #ifndef OL_BLENDERS_HPP
#define OL_BLENDERS_HPP
#include "Includes.hpp"
#include "Declspec.hpp"
#include <stack>
namespace ol {
// Blenders - different color blending styles
// Alpha blender (default): renders translucent bitmaps,
// alpha values of the source pixels tell the opacity
//
// Additive blender: Increases the lightness of the underlying pixels
// alpha values of the source pixels tell the intensity
//
// Subtractive blender: Decreases the lightness of the underlying pixels
// alpha values the source pixels tell the intensity
enum Blender {
ALPHA_BLENDER,
ADDITIVE_BLENDER,
SUBTRACTIVE_BLENDER,
COPY_BLENDER,
FULL_ADDITIVE_BLENDER,
CUSTOM
};
class OL_LIB_DECLSPEC Blenders {
public:
// Sets the active blending function //
// Additive blender lits the destination bitmap, //
// subtractive blender darkens it. //
static void Set( Blender blender );
// Sets a custom OpenGL blender as the active blending function //
static void Set( GLenum sourceFactor, GLenum destFactor );
// Pushes the active blender to the blender stack //
inline static void Push() {
blenderStack.push( activeBlender );
}
// Pops the most recently added blender from the blender stack //
static void Pop();
// Selects the active blender (automatically done) //
static void SelectBlender();
private:
class BlenderObj {
public:
BlenderObj()
: source( GL_ONE ), dest( GL_ZERO ) {}
BlenderObj( GLenum source, GLenum dest )
: source( source ), dest( dest ) {}
GLenum source, dest;
};
static BlenderObj activeBlender;
static std::stack< BlenderObj > blenderStack;
};
}
#endif // OL_BLENDERS_HPP
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