/// Converts red, green, blue, and alpha components to packed RGBA8.
#define RGBA8(r,g,b,a)  (((r)&0xff)|(((g)&0xff)<<8)|(((b)&0xff)<<16)|(((a)&0xff)<<24))

/// Same as RGBA8 except with alpha=0xff.
#define RGBA8_MAXALPHA(r,g,b) RGBA8(r,g,b,0xff)

/// Do not use viInitialize/viExit when using these.
void gfxInitDefault(void);
void gfxExit(void);

/// Note that "framebuffer" here is technically windowbuffer.

void gfxWaitForVsync();
void gfxSwapBuffers();
u8* gfxGetFramebuffer(u32* width, u32* height);
size_t gfxGetFramebufferSize(void); /// Use this to get the actual byte-size of the buffer for use with memset/etc, do not calculate the byte-size manually with the width and height from gfxGetFramebuffer. The height returned by gfxGetFramebuffer is the display height not the aligned height.
void gfxSetDoubleBuffering(bool doubleBuffering);
void gfxFlushBuffers(void);

/// Use this to get the pixel-offset in the framebuffer. Returned value is in pixels, not bytes.
/// This implements tegra blocklinear, with hard-coded constants etc.
static inline u32 gfxGetFramebufferDisplayOffset(u32 x, u32 y) {
    u32 width=0, height=0;
    u32 tilepos, tmp_pos;

    gfxGetFramebuffer(&width, &height);

    if (x >= width) x = width-1;
    if (y >= height) y = height-1;

    y = height-1-y;

    tilepos = ((y & 127) / 16) + (x/16*8) + ((y/16/8)*(width/16*8));
    tilepos = tilepos*16*16 * 4;

    tmp_pos = ((y%16)/8)*512 + ((x%16)/8)*256 + ((y%8)/2)*64 + ((x%8)/4)*32 + (y%2)*16 + (x%4)*4;//This line is a modified version of code from the Tegra X1 datasheet.

    return (tilepos + tmp_pos) / 4;
}