Using HiColor graphics

Introduction to the 15bpp/16bpp SuperVGA graphics modes

15-bit color-format

R R R R R G G G G G B B B B B

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Each pixel is controlled by a two-byte element of display memory according to the format shown above (‘little endian’ convention)

Radeon’s 15bpp VESA modes

• mode 0x010D: 15-bpp 320x200• mode 0x0193: 15-bpp 320x240• mode 0x01A3: 15-bpp 400x300• mode 0x01B3: 15-bpp 512x384• mode 0x01C3: 15-bpp 640x350 • mode 0x0183: 15-bpp 640x400 • mode 0x0110: 15-bpp 640x480• mode 0x0113: 15-bpp 800x600• mode 0x0116: 15-bpp 1024x768• mode 0x0119: 15-bpp 1280x1024

16-bit color-format

R R R R R G G G G G G B B B B B

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Each pixel is controlled by a two-byte element of display memory according to the format shown above (‘little endian’ convention)

Radeon’s 16bpp VESA modes

• mode 0x010E: 16-bpp 320x200 • mode 0x0194: 16-bpp 320x240 • mode 0x01A4: 16-bpp 400x300 • mode 0x01B4: 16-bpp 512x384 • mode 0x01C4: 16-bpp 640x350 • mode 0x0184: 16-bpp 640x400 • mode 0x0111: 16-bpp 640x480 • mode 0x0114: 16-bpp 800x600 • mode 0x0117: 16-bpp 1024x768 • mode 0x011A: 16-bpp 1280x1024

Application programming

unsigned short *vram;

vram = (unsigned short *)0xA0000000;

// For 15bpp color-format

unsigned short red = (0x1F << 10);

unsigned short green = (0x1F << 5);

unsigned short blue = (0x1F << 0);

unsigned short white = 0x7FFF;

In-class exercise #1

• Write a ‘bare-bones’ graphics application that draws a border around the screen

• For each of the seven color-combinations named below, draw an array of colored boxes that shows all of the 32 possible intensities of that color:– pure red, pure green, pure blue– blue-and-green, blue-and-red, green-and-red– red-and-green-and-blue

In-class exercise #2

• Revise our ‘wfmodel1.cpp’ demo-program so that it uses 15bpp color-format instead of 8bpp color-format (but keep the same 640-by-480 screen-resolution)