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add fb_clear(), just clear to solid bluish color for now

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This commit is contained in:
Josh Holtrop 2020-10-20 17:28:16 -04:00
parent 70b4db9dbb
commit fb88595dec
1 changed files with 6 additions and 16 deletions
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22
src/fb.c
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@ -17,28 +17,18 @@ static inline void fb_set_pixel(int x, int y, uint8_t r, uint8_t g, uint8_t b)
fb[fb_pitch * y / 4u + x] = build_pixel(r, g, b);
}
static void fb_clear(void)
{
memset32(fb, 0x002C55u, fb_pitch * fb_height / 4u);
}
void fb_init(uint32_t * addr, uint32_t width, uint32_t height, uint32_t pitch)
{
fb = addr;
fb_width = width;
fb_height = height;
fb_pitch = pitch;
for (uint32_t row = 0u; row < fb_height; row++)
{
for (uint32_t col = 0u; col < fb_width; col++)
{
uint32_t er = (col * fb_height) / fb_width;
int32_t dr = (int32_t)row - (int32_t)er;
if (dr < 0)
{
dr = -dr;
}
uint8_t r = 255u - ((uint32_t)dr * 256u / fb_height);
uint8_t g = col * 256u / fb_width;
uint8_t b = row * 256u / fb_height;
fb[fb_pitch * row / 4u + col] = (r << 16u) | (g << 8u) | b;
}
}
fb_clear();
}
bool fb_ready(void)