draw_blending.h

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#ifndef __DRAW_BLENDING_H__
#define __DRAW_BLENDING_H__
 
#include <tamtypes.h>
 
// color = (c1-c2)*a>>7 + c3

#define BLEND_COLOR_SOURCE      0
#define BLEND_COLOR_DEST        1
#define BLEND_COLOR_ZERO        2
 
#define BLEND_ALPHA_SOURCE      0
#define BLEND_ALPHA_DEST        1
#define BLEND_ALPHA_FIXED       2

#define ALPHA_CORRECT_RGBA32    0
#define ALPHA_CORRECT_RGBA16    1
 
typedef struct {
    char color1;
    char color2;
    char alpha;
    char color3;
    unsigned char fixed_alpha;
} blend_t;
 
#ifdef __cplusplus
extern "C" {
#endif

extern qword_t *draw_pixel_alpha_control(qword_t *q, int enable);

extern qword_t *draw_alpha_blending(qword_t *q, int context, blend_t *blend);

extern qword_t *draw_alpha_correction(qword_t *q, int context, int alpha);
 
#ifdef __cplusplus
}
#endif
 
#endif /* __DRAW_BLENDING_H__ */