Using HiColor graphics

1
Using HiColor graphics

• Introduction to the 15bpp/16bpp SuperVGA graphics
  modes

2
15-bit color-format
15 14 13 12 11 10 9 8 7
6 5 4 3 2 1 0
R
R
R
R
R
G
G
G
G
G
B
B
B
B
B
Each pixel is controlled by a two-byte element of
display memory according to the format shown
above (little endian convention)
3
Radeons 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

4
16-bit color-format
15 14 13 12 11 10 9 8 7
6 5 4 3 2 1 0
R
R
R
R
R
G
G
G
G
G
G
B
B
B
B
B
Each pixel is controlled by a two-byte element of
display memory according to the format shown
above (little endian convention)
5
Radeons 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

6
Application programming

• unsigned short vram
• vram (unsigned short )0xA0000000
• // For 15bpp color-format
• unsigned short red (0x1F ltlt 10)
• unsigned short green (0x1F ltlt 5)
• unsigned short blue (0x1F ltlt 0)
• unsigned short white 0x7FFF

7
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

8
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)