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Updated vga screen updates routines.

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correct frame per second,
corrected dac read/write index
added support for split screen.
Some more fixes i forgot


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@591
This commit is contained in:
Sjoerd van der Berg 2002-12-22 15:11:29 +00:00
parent f1fd4ae696
commit d54ae0640b
10 changed files with 255 additions and 189 deletions
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39
src/hardware/vga.h
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@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2002 The DOSBox Team
*
* This program is free software; you can redistribute it and/or modify
@ -42,9 +42,11 @@ typedef struct {
bool retrace; /* A retrace has started */
Bitu scan_len;
/* Screen resolution and memory mode */
Bitu vdisplayend;
Bitu hdisplayend;
/* Some other screen related variables */
Bitu line_compare;
Bitu clock;
bool clock_half;
bool chained; /* Enable or Disabled Chain 4 Mode */
bool gfxmode; /* Yes or No Easy no */
@ -56,7 +58,6 @@ typedef struct {
bool vline_double;
Bit8u vline_height;
bool pixel_double;
/* Pixel Scrolling */
Bit8u pel_panning; /* Amount of pixels to skip when starting horizontal line */
Bit8u hlines_skip;
@ -85,12 +86,16 @@ typedef struct {
bool resizing;
Bitu width;
Bitu height;
Bitu pitch;
Bitu blank;
bool double_width;
bool double_height;
Bitu lines;
Bit8u * font;
Bit8u font_height;
Bit8u cursor_enable;
Bit8u cursor_row;
Bit8u cursor_col;
Bit8u cursor_count;
struct {
Bitu row,col,sline,eline,count;
} cursor;
} VGA_Draw;
@ -170,7 +175,8 @@ typedef struct {
Bit8u pel_mask;
Bit8u pel_index;
Bit8u state;
Bit8u index;
Bit8u write_index;
Bit8u read_index;
Bitu first_changed;
RGBEntry rgb[0x100];
Bit8u attr[16];
@ -202,8 +208,8 @@ typedef struct {
VGA_Dac dac;
VGA_Latch latch;
VGA_Memory mem;
//Special little hack to let the memory run over into the buffer
Bit8u buffer[1024*1024];
/* Extra buffer following main video ram with double data for overflowing of addresses */
Bit8u buffer[1024*1024]; /* 256 kb vid ram with 16 colors and double addresses */
} VGA_Type;
@ -217,11 +223,10 @@ void VGA_StartResize(void);
/* The Different Drawing functions */
void VGA_DrawTEXT(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX256_Fast(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX256_Full(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX16_Full(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX4_Full(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX2_Full(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX256U_Full(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX16_Fast(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX4_Fast(Bit8u * bitdata,Bitu next_line);
void VGA_DrawGFX2_Fast(Bit8u * bitdata,Bitu next_line);
/* The Different Memory Read/Write Handlers */
Bit8u VGA_NormalReadHandler(Bit32u start);