//This just shows how scrn memory works. //See ::/Demo/Lectures/MiniGrLib.HC U0 PlotXY(I64 x,I64 y) { //Scrn bits are revd LBts(text.vga_alias,y*GR_WIDTH+x^7); } U0 Main() { I64 i; //This makes all 4 color planes active. OutU8(VGAP_IDX,VGAR_MAP_MASK); OutU8(VGAP_DATA,WHITE); MemSet(text.vga_alias,0,GR_WIDTH*GR_HEIGHT/8); OutU8(VGAP_IDX,VGAR_MAP_MASK); OutU8(VGAP_DATA,RED); for (i=0;i<200;i++) PlotXY(i,i); OutU8(VGAP_IDX,VGAR_MAP_MASK); OutU8(VGAP_DATA,GREEN); for (i=0;i<200;i++) PlotXY(100,i); OutU8(VGAP_IDX,VGAR_MAP_MASK); OutU8(VGAP_DATA,BLUE); for (i=0;i<200;i++) PlotXY(200-i,i); /*If you want a mixed color sel multiple planes but you have to be sure the unseled planes are zero, so sel them and make them zero. You can't do reads on VGA memory, by the way. That means no read-modify-writes, too. */ Busy(4000000); //TempleOS has a 4 plane memory duplicate of the scrn, gr.scrn_image, //and only writes actual changes. See GrUpdateVGAGraphics(). //<CTRL-ALT-v> will flush scrn VGA cache. VGAFlush; } Main; //See ::/Demo/Lectures/GraphicsCPULoad.HC.