1 /* Project 16 Source Code~
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2 * Copyright (C) 2012-2017 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover
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4 * This file is part of Project 16.
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6 * Project 16 is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 3 of the License, or
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9 * (at your option) any later version.
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11 * Project 16 is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>, or
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18 * write to the Free Software Foundation, Inc., 51 Franklin Street,
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19 * Fifth Floor, Boston, MA 02110-1301 USA.
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23 * Functions for handling modex and doing other basic graphics stuff.
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28 #include "src/lib/16_head.h"
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29 //#include "src/lib/planar.h"
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30 //#include "src/lib/modex16/16planar.h"
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31 #include "src/lib/16text.h"
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32 ////#include "src/lib/modex16/320x240.h"
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33 // #include "src/lib/modex16/320x200.h"
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34 // #include "src/lib/modex16/256x192.h"
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35 // #include "src/lib/modex16/192x144_.h"
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36 // #include "src/lib/modex16/160x120.h"
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39 #include <hw/cpu/cpu.h>
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40 #include <hw/dos/dos.h>
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41 #include <hw/vga/vga.h>
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42 #include <hw/vga/vrl.h>
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43 #include <hw/vga/vrs.h>
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51 #define TILEWHD TILEWH*2
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52 #define QUADWH TILEWH/2
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54 //#define OLDBGPRESERVE
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56 /* -========================== Types & Macros ==========================- */
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57 #define PAGE_OFFSET(x,y) (((y)<<6)+((y)<<4)+((x)>>2))
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58 #define PLANE(x) (1 << ((x) & 3))
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59 #define SELECT_ALL_PLANES() outpw(0x03c4, 0xff02)
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61 // clips for rectangles not on 4s
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63 byte lclip[] = {0x0f, 0x0e, 0x0c, 0x08}; \
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64 byte rclip[] = {0x00, 0x01, 0x03, 0x07};
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67 byte pclip[] = {1,2,4,8};
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76 /* -======================= Constants & Vars ==========================- */
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77 extern byte far* VGA; /* The VGA Memory */
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78 #define SCREEN_SEG 0xa000
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79 #define VIDEO_INT 0x10
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80 #define SET_MODE 0x00
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81 #define VGA_256_COLOR_MODE 0x13
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82 #define TEXT_MODE 0x03
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84 #define SC_INDEX 0x03c4
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87 #define SC_MAPMASK 2
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88 #define SC_CHARMAP 3
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89 #define SC_MEMMODE 4
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91 #define CRTC_INDEX 0x3D4
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92 #define CRTC_H_TOTAL 0
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93 #define CRTC_H_DISPEND 1
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94 #define CRTC_H_BLANK 2
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95 #define CRTC_H_ENDBLANK 3
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96 #define CRTC_H_RETRACE 4
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97 #define CRTC_H_ENDRETRACE 5
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98 #define CRTC_V_TOTAL 6
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99 #define CRTC_OVERFLOW 7
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100 #define CRTC_ROWSCAN 8
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101 #define CRTC_MAXSCANLINE 9
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102 #define CRTC_CURSORSTART 10
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103 #define CRTC_CURSOREND 11
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104 #define CRTC_STARTHIGH 12
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105 #define CRTC_STARTLOW 13
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106 #define CRTC_CURSORHIGH 14
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107 #define CRTC_CURSORLOW 15
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108 #define CRTC_V_RETRACE 16
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109 #define CRTC_V_ENDRETRACE 17
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110 #define CRTC_V_DISPEND 18
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111 #define CRTC_OFFSET 19
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112 #define CRTC_UNDERLINE 20
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113 #define CRTC_V_BLANK 21
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114 #define CRTC_V_ENDBLANK 22
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115 #define CRTC_MODE 23
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116 #define CRTC_LINECOMPARE 24
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118 #define GC_INDEX 0x03ce
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119 #define GC_SETRESET 0
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120 #define GC_ENABLESETRESET 1
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121 #define GC_COLORCOMPARE 2
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122 #define GC_DATAROTATE 3
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123 #define GC_READMAP 4
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125 #define GC_MISCELLANEOUS 6
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126 #define GC_COLORDONTCARE 7
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127 #define GC_BITMASK 8
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129 #define AC_INDEX 0x03c0
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130 #define SC_DATA 0x03c5
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131 #define CRTC_DATA 0x03d5
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132 #define MISC_OUTPUT 0x03c2
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133 #define HIGH_ADDRESS 0x0C
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134 #define LOW_ADDRESS 0x0D
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135 #define VRETRACE 0x08
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136 //#define INPUT_STATUS_1 0x03da defined in 16_head
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137 #define STATUS_REGISTER_1 INPUT_STATUS_1
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138 #define ATR_INDEX AC_INDEX
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139 #define ATR_OVERSCAN 17
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140 #define DISPLAY_ENABLE 0x01
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141 #define MAP_MASK 0x02
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142 #define PAL_READ_REG 0x03C7 /* Color register, read address */
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143 #define PAL_WRITE_REG 0x03C8 /* Color register, write address */
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144 #define PAL_DATA_REG 0x03C9 /* Color register, data port */
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145 #define PAL_SIZE (256 * 3)
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147 //===========================================================================
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149 #define SCREENSEG 0xa000
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151 //#define SCREENWIDTH 80 // default screen width in bytes
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152 //#define MAXSCANLINES 240 // size of ylookup table
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154 //#define CHARWIDTH 2
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155 //#define TILEWIDTH 4
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157 //===========================================================================
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160 // VGA hardware routines
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163 void VGAMAPMASK(byte x);
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164 void VGAWRITEMODE(byte x);
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165 void VGAREADMAP(byte x);
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167 /* -============================ Functions =============================- */
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168 /* mode switching, page, and plane functions */
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169 void VGAmodeX(sword vq, boolean cmem, global_game_variables_t *gv);
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170 void modexEnter(sword vq, boolean cmem, global_game_variables_t *gv);
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173 void VL_SetLineWidth (unsigned width, ofs_t *ofs);
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174 void modexsetBaseXMode();
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175 page_t modexDefaultPage(page_t *p);
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176 page_t modexNextPage(page_t *p);
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177 page_t modexNextPageFlexibleSize(page_t *p, word x, word y);
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178 void modexCalcVmemRemain(video_t *video);
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179 void VL_Initofs(video_t *video);
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180 void modexHiganbanaPageSetup(video_t *video);
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181 //void modexShowPage(page_t *page);
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182 void VL_ShowPage(page_t *page, boolean vsync, boolean sr);
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183 void modexPanPage(page_t *page, int dx, int dy);
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184 void modexSelectPlane(byte plane);
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185 void modexClearRegion(page_t *page, int x, int y, int w, int h, byte color);
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186 /* moved to src/lib/modex16/16render.c */
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187 void modexCopyPageRegion(page_t *dest, page_t *src, word sx, word sy, word dx, word dy, word width, word height);
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189 /* Palette fade and flash effects */
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190 void VL_FadeIn (int start, int end, byte far *palette, int steps, video_t *v);
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191 void modexFadeOn(word fade, byte *palette);
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192 void modexFadeOff(word fade, byte *palette);
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193 void modexFlashOn(word fade, byte *palette);
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194 void modexFlashOff(word fade, byte *palette);
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196 /* palette loading and saving */
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197 void modexPalSave(byte *palette);
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198 //byte *modexNewPal();
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199 void modexLoadPalFile(char *filename, byte *palette);
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200 void VL_LoadPalFile(const char *filename, byte *palette);
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201 void VL_LoadPalFilewithoffset(const char *filename, byte *palette, word o);
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202 void VL_UpdatePaletteWrite(byte *palette, word o);
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203 void modexSavePalFile(char *filename, byte *palette);
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204 #define MenuFadeIn() VL_FadeIn(0,255,&gamepal,10)
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206 /* fixed palette functions */
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207 void modexPalBlack();
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208 void modexPalWhite();
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210 /* utility functions */
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211 void modexPalUpdate(byte *p);
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212 void modexPalUpdate0(byte *p);
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213 word modexPalOverscan(word col);
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214 void VL_Plot (int x, int y, int color, ofs_t *ofs);
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215 void VL_Hlin (unsigned x, unsigned y, unsigned width, unsigned color, ofs_t *ofs);
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216 void VL_Vlin (int x, int y, int height, int color, ofs_t *ofs);
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217 void VL_Bar (int x, int y, int width, int height, int color, ofs_t *ofs);
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218 void modexputPixel(page_t *page, int x, int y, byte color);
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219 byte modexgetPixel(page_t *page, int x, int y);
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221 #if 0 // not needed anymore. maybe good for reference purposes though.
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222 static inline void modexwritepixel(page_t *page, int x, int y, word addr, byte color)
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224 /* Each address accesses four neighboring pixels, so set
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225 Write Plane Enable according to which pixel we want
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226 to modify. The plane is determined by the two least
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227 significant bits of the x-coordinate: */
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228 modexSelectPlane(PLANE(x));
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229 //outp(SC_INDEX, 0x02);
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230 //outp(SC_DATA, 0x01 << (x & 3));
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232 /* The offset of the pixel into the video segment is
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233 offset = (width * y + x) / 4, and write the given
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234 color to the plane we selected above. Heed the active
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235 page start selection. */
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236 vga_state.vga_graphics_ram[addr] = color;
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238 static inline byte modexreadPixel(page_t *page, int x, int y, word addr)
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240 /* Select the plane from which we must read the pixel color: */
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241 outpw(GC_INDEX, 0x04);
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242 outpw(GC_INDEX+1, x & 3);
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243 return vga_state.vga_graphics_ram[addr];
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247 void modexDrawChar(page_t *page, int x/*for planar selection only*/, word t, word col, word bgcol, word addr);
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248 void modexprint(page_t *page, sword x, sword y, word t, boolean tlsw, word col, word bgcol, boolean sw, const byte *str);
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249 void modexprintbig(page_t *page, word x, word y, word t, word col, word bgcol, const byte *str);
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250 void modexpdump(page_t *pee);
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251 void modexcls(page_t *page, byte color, byte *Where);
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252 void VL_PatternDraw(video_t *video, word pn, boolean sw, boolean allsw);
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253 void modexWaitBorder();
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254 void modexWaitBorder_start();
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255 void modexWaitBorder_end();
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256 void VL_WaitVBL(word num);
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257 void VL_PrintmodexmemInfo(video_t *v);
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