forked from Lephenixnoir/gint
40 lines
862 B
C
40 lines
862 B
C
#define GINT_NEED_VRAM
|
|
#include <gint/display.h>
|
|
|
|
/* dclear() - fill the screen with a single color */
|
|
void dclear(color_t color)
|
|
{
|
|
/* SuperH only supports a single write-move addressing mode, which is
|
|
pre-decrement write; the other similar mode is post-increment
|
|
read. So we'll use pre-decrement writes to improve performance. */
|
|
|
|
if(color != color_white && color != color_black) return;
|
|
uint32_t fill = -(color >> 1);
|
|
|
|
uint32_t *index = vram + 256;
|
|
|
|
while(index > vram)
|
|
{
|
|
/* Do it by batches to avoid losing cycles on loop tests */
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
*--index = fill;
|
|
}
|
|
}
|