SVGA support by emulating an S3/trio 64 card with 2 mb
Support for dual CGA palette and background colors Support for attribute palette group changing Changes to work together with bios somewhat in supporting different video cards Basic support for Tandy pcjr 320x200x16 color mode Text mode support for changing font and panning support. Support for data rotate in 16 color modes. Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1063
This commit is contained in:
Sjoerd van der Berg
parent
e8892d4f61
commit
c908fa9a09
10 changed files with 1009 additions and 404 deletions
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@ -22,221 +22,65 @@
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#include "dosbox.h"
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#include "video.h"
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#include "pic.h"
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#include "render.h"
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#include "timer.h"
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#include "vga.h"
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#include "inout.h"
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VGA_Type vga;
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Bit32u CGAWriteTable[256];
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Bit32u CGA_4_Table[256];
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Bit32u ExpandTable[256];
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Bit32u Expand16Table[4][16];
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Bit32u Expand16BigTable[0x10000];
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Bit32u FillTable[16];
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static void EndRetrace(void) {
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/* start the actual display update now */
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RENDER_DoUpdate();
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vga.config.retrace=false;
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}
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static void VGA_BlankTimer() {
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PIC_AddEvent(VGA_BlankTimer,vga.draw.blank);
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PIC_AddEvent(EndRetrace,667);
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/* Setup a timer to destroy the vertical retrace bit in a few microseconds */
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vga.config.real_start=vga.config.display_start;
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vga.config.retrace=true;
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}
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static void VGA_DrawHandler(RENDER_Part_Handler part_handler) {
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Bit8u * buf,* bufsplit;
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/* Draw the current frame */
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if (!vga.draw.resizing) {
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if (vga.config.line_compare<vga.draw.lines) {
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Bitu stop=vga.config.line_compare;
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if (vga.draw.double_height) stop/=2;
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if (stop>=vga.draw.height){
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LOG(LOG_VGAGFX,LOG_NORMAL)("Split at %d",stop);
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goto drawnormal;
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}
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switch (vga.mode) {
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case GFX_16:
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buf=&vga.buffer[vga.config.real_start*8+vga.config.pel_panning];
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bufsplit=vga.buffer;
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break;
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case GFX_256U:
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buf=&vga.mem.linear[vga.config.real_start*4+vga.config.pel_panning/2];
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bufsplit=vga.mem.linear;
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break;
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case GFX_256C:
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buf=memory+0xa0000;
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bufsplit=memory+0xa0000;
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break;
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default:
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LOG(LOG_VGAGFX,LOG_NORMAL)("VGA:Unhandled split screen mode %d",vga.mode);
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goto norender;
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}
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part_handler(buf,0,0,vga.draw.width,stop);
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part_handler(bufsplit,0,stop,vga.draw.width,vga.draw.height-stop);
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} else {
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drawnormal:
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switch (vga.mode) {
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case GFX_2:
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VGA_DrawGFX2_Fast(vga.buffer,vga.draw.width);
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buf=vga.buffer;
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break;
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case GFX_4:
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VGA_DrawGFX4_Fast(vga.buffer,vga.draw.width);
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buf=vga.buffer;
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break;
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case TEXT_16:
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VGA_DrawTEXT(vga.buffer,vga.draw.width);
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buf=vga.buffer;
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break;
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case GFX_16:
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buf=&vga.buffer[vga.config.real_start*8+vga.config.pel_panning];
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break;
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case GFX_256C:
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buf=memory+0xa0000;
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break;
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case GFX_256U:
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buf=&vga.mem.linear[vga.config.real_start*4+vga.config.pel_panning/2];
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break;
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}
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part_handler(buf,0,0,vga.draw.width,vga.draw.height);
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}
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norender:;
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}
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}
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void VGA_FindSettings(void) {
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/* Sets up the correct memory handler from the vga.mode setting */
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MEM_ClearPageHandlers(PAGE_COUNT(0xa0000),PAGE_COUNT(0x20000));
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/* Detect the kind of video mode this is */
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if (vga.config.gfxmode) {
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if (vga.config.vga_enabled) {
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if (vga.config.chained) {
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/* 256 color chained vga */
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vga.mode=GFX_256C;
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//Doesn't need a memory handler
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} else {
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/* 256 color unchained vga */
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vga.mode=GFX_256U;
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MEM_SetupPageHandlers(PAGE_COUNT(0xa0000),PAGE_COUNT(0x10000),
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&VGA_NormalReadHandler,&VGA_GFX_256U_WriteHandler);
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}
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} else if (vga.config.cga_enabled) {
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/* 4 color cga */
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//TODO Detect hercules modes, probably set them up in bios too
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if (vga.seq.clocking_mode & 0x8) {
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vga.mode=GFX_4;
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// MEM_SetupPageHandlers(PAGE_COUNT(0x0b8000),PAGE_COUNT(0x10000),&VGA_GFX_4_ReadHandler,&VGA_GFX_4_WriteHandler);
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} else vga.mode=GFX_2;
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//TODO Maybe also use a page handler for cga mode
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} else {
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/* 16 color ega */
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vga.mode=GFX_16;
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MEM_SetupPageHandlers(PAGE_COUNT(0xa0000),PAGE_COUNT(0x10000),
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&VGA_NormalReadHandler,&VGA_GFX_16_WriteHandler);
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}
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} else {
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vga.mode=TEXT_16;
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}
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void VGA_SetMode(VGAModes mode) {
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vga.mode=mode;
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VGA_SetupHandlers();
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VGA_StartResize();
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}
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static void VGA_DoResize(void) {
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/* Calculate the FPS for this screen */
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double fps;
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Bitu vtotal=2 + (vga.crtc.vertical_total | ((vga.crtc.overflow & 1) << 8) | ((vga.crtc.overflow & 0x20) << 4) );
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Bitu htotal=5 + vga.crtc.horizontal_total;
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Bitu vdispend = 1 + (vga.crtc.vertical_display_end | ((vga.crtc.overflow & 2)<<7) | ((vga.crtc.overflow & 0x40) << 3) );
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Bitu hdispend = 1 + (vga.crtc.horizontal_display_end);
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//TODO Maybe check if blanking comes before display_end
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double clock=(double)vga.config.clock;
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/* Check for 8 for 9 character clock mode */
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if (vga.seq.clocking_mode & 1 ) clock/=8; else clock/=9;
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/* Check for pixel doubling, master clock/2 */
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if (vga.seq.clocking_mode & 0x8) clock/=2;
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LOG(LOG_VGA,LOG_NORMAL)("H total %d, V Total %d",htotal,vtotal);
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LOG(LOG_VGA,LOG_NORMAL)("H D End %d, V D End %d",hdispend,vdispend);
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fps=clock/(vtotal*htotal);
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vga.draw.resizing=false;
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Bitu width,height,pitch,flags;
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flags=0;
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vga.draw.lines=height=vdispend;
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width=hdispend;
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vga.draw.double_height=vga.config.vline_double;
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vga.draw.double_width=(vga.seq.clocking_mode & 0x8)>0;
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vga.draw.font_height=vga.config.vline_height+1;
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switch (vga.mode) {
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case GFX_256C:
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case GFX_256U:
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vga.draw.double_width=true; //Hack since 256 color modes use 2 clocks for a pixel
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/* Don't know might do this different sometime, will have to do for now */
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if (!vga.draw.double_height) {
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if (vga.config.vline_height&1) {
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vga.draw.double_height=true;
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vga.draw.font_height/=2;
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}
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}
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width<<=2;
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pitch=vga.config.scan_len*8;
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break;
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case GFX_16:
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width<<=3;
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pitch=vga.config.scan_len*16;
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break;
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case GFX_4:
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width<<=3;
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pitch=width;
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break;
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case GFX_2:
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width<<=3;
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pitch=width;
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break;
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case TEXT_16:
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/* probably a 16-color text mode, got to detect mono mode somehow */
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width<<=3; /* 8 bit wide text font */
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if (width>640) width=640;
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if (height>480) height=480;
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pitch=width;
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};
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if (vga.draw.double_height) {
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flags|=DoubleHeight;
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height/=2;
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}
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if (vga.draw.double_width) {
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flags|=DoubleWidth;
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/* Double width is dividing main clock, the width should be correct already for this */
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}
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if (( width != vga.draw.width) || (height != vga.draw.height) || (pitch != vga.draw.pitch)) {
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PIC_RemoveEvents(VGA_BlankTimer);
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vga.draw.width=width;
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vga.draw.height=height;
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vga.draw.pitch=pitch;
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LOG(LOG_VGA,LOG_NORMAL)("Width %d, Height %d",width,height);
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LOG(LOG_VGA,LOG_NORMAL)("Flags %X, fps %f",flags,fps);
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RENDER_SetSize(width,height,8,pitch,((float)width/(float)height),flags,&VGA_DrawHandler);
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vga.draw.blank=(Bitu)(1000000/fps);
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PIC_AddEvent(VGA_BlankTimer,vga.draw.blank);
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}
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};
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void VGA_StartResize(void) {
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if (!vga.draw.resizing) {
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vga.draw.resizing=true;
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/* Start a resize after 50 ms */
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PIC_AddEvent(VGA_DoResize,50000);
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PIC_AddEvent(VGA_SetupDrawing,50000);
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}
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}
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void VGA_SetClock(Bitu which,Bitu target) {
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struct{
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Bitu n,m;
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Bits err;
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} best;
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best.err=target;
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Bitu n,m,r;
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for (r = 0; r <= 3; r++) {
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Bitu f_vco = target * (1 << r);
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if (MIN_VCO <= f_vco && f_vco < MAX_VCO) break;
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}
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for (n=1;n<=31;n++) {
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m=(target * (n + 2) * (1 << r) + (S3_CLOCK_REF/2)) / S3_CLOCK_REF - 2;
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if (0 <= m && m <= 127) {
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Bitu temp_target = S3_CLOCK(m,n,r);
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Bits err = target - temp_target;
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if (err < 0) err = -err;
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if (err < best.err) {
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best.err = err;
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best.m = m;
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best.n = n;
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}
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}
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}
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/* Program the s3 clock chip */
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vga.s3.clk[which].m=best.m;
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vga.s3.clk[which].r=r;
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vga.s3.clk[which].n=best.n;
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VGA_StartResize();
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}
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void VGA_Init(Section* sec) {
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vga.draw.resizing=false;
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VGA_SetupMemory();
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@ -245,14 +89,16 @@ void VGA_Init(Section* sec) {
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VGA_SetupGFX();
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VGA_SetupSEQ();
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VGA_SetupAttr();
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VGA_SetClock(0,CLK_25);
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VGA_SetClock(1,CLK_28);
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/* Generate tables */
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Bitu i,j;
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for (i=0;i<256;i++) {
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ExpandTable[i]=i | (i << 8)| (i <<16) | (i << 24);
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#ifdef WORDS_BIGENDIAN
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CGAWriteTable[i]=((i>>0)&3) | (((i>>2)&3) << 8)| (((i>>4)&3) <<16) | (((i>>6)&3) << 24);
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CGA_4_Table[i]=((i>>0)&3) | (((i>>2)&3) << 8)| (((i>>4)&3) <<16) | (((i>>6)&3) << 24);
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#else
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CGAWriteTable[i]=((i>>6)&3) | (((i>>4)&3) << 8)| (((i>>2)&3) <<16) | (((i>>0)&3) << 24);
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CGA_4_Table[i]=((i>>6)&3) | (((i>>4)&3) << 8)| (((i>>2)&3) <<16) | (((i>>0)&3) << 24);
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#endif
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}
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for (i=0;i<16;i++) {
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