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415 lines
9.4 KiB
C
415 lines
9.4 KiB
C
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// DOOM graphics stuff for X11, UNIX.
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//
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//-----------------------------------------------------------------------------
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static const char
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rcsid[] = "$Id: i_x.c,v 1.6 1997/02/03 22:45:10 b1 Exp $";
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#include "config.h"
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#include "v_video.h"
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#include "m_argv.h"
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#include "d_event.h"
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#include "d_main.h"
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#include "i_video.h"
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#include "z_zone.h"
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#include "tables.h"
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#include "doomkeys.h"
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#include "doomgeneric.h"
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#include <stdbool.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <sys/types.h>
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//#define CMAP256
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struct FB_BitField
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{
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uint32_t offset; /* beginning of bitfield */
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uint32_t length; /* length of bitfield */
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};
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struct FB_ScreenInfo
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{
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uint32_t xres; /* visible resolution */
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uint32_t yres;
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uint32_t xres_virtual; /* virtual resolution */
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uint32_t yres_virtual;
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uint32_t bits_per_pixel; /* guess what */
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/* >1 = FOURCC */
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struct FB_BitField red; /* bitfield in s_Fb mem if true color, */
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struct FB_BitField green; /* else only length is significant */
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struct FB_BitField blue;
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struct FB_BitField transp; /* transparency */
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};
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static struct FB_ScreenInfo s_Fb;
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int fb_scaling = 1;
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int usemouse = 0;
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struct color {
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uint32_t b:8;
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uint32_t g:8;
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uint32_t r:8;
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uint32_t a:8;
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};
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static struct color colors[256];
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void I_GetEvent(void);
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// The screen buffer; this is modified to draw things to the screen
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byte *I_VideoBuffer = NULL;
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// If true, game is running as a screensaver
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boolean screensaver_mode = false;
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// Flag indicating whether the screen is currently visible:
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// when the screen isnt visible, don't render the screen
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boolean screenvisible;
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// Mouse acceleration
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//
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// This emulates some of the behavior of DOS mouse drivers by increasing
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// the speed when the mouse is moved fast.
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//
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// The mouse input values are input directly to the game, but when
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// the values exceed the value of mouse_threshold, they are multiplied
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// by mouse_acceleration to increase the speed.
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float mouse_acceleration = 2.0;
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int mouse_threshold = 10;
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// Gamma correction level to use
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int usegamma = 0;
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typedef struct
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{
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byte r;
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byte g;
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byte b;
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} col_t;
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// Palette converted to RGB565
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static uint16_t rgb565_palette[256];
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void cmap_to_rgb565(uint16_t * out, uint8_t * in, int in_pixels)
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{
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int i, j;
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struct color c;
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uint16_t r, g, b;
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for (i = 0; i < in_pixels; i++)
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{
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c = colors[*in];
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r = ((uint16_t)(c.r >> 3)) << 11;
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g = ((uint16_t)(c.g >> 2)) << 5;
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b = ((uint16_t)(c.b >> 3)) << 0;
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*out = (r | g | b);
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in++;
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for (j = 0; j < fb_scaling; j++) {
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out++;
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}
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}
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}
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void cmap_to_fb(uint8_t * out, uint8_t * in, int in_pixels)
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{
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int i, j, k;
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struct color c;
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uint32_t pix;
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uint16_t r, g, b;
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for (i = 0; i < in_pixels; i++)
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{
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c = colors[*in]; /* R:8 G:8 B:8 format! */
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r = (uint16_t)(c.r >> (8 - s_Fb.red.length));
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g = (uint16_t)(c.g >> (8 - s_Fb.green.length));
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b = (uint16_t)(c.b >> (8 - s_Fb.blue.length));
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pix = r << s_Fb.red.offset;
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pix |= g << s_Fb.green.offset;
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pix |= b << s_Fb.blue.offset;
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for (k = 0; k < fb_scaling; k++) {
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for (j = 0; j < s_Fb.bits_per_pixel/8; j++) {
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*out = (pix >> (j*8));
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out++;
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}
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}
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in++;
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}
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}
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void I_InitGraphics (void)
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{
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int i;
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memset(&s_Fb, 0, sizeof(struct FB_ScreenInfo));
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s_Fb.xres = DOOMGENERIC_RESX;
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s_Fb.yres = DOOMGENERIC_RESY;
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s_Fb.xres_virtual = s_Fb.xres;
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s_Fb.yres_virtual = s_Fb.yres;
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s_Fb.bits_per_pixel = 32;
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s_Fb.blue.length = 8;
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s_Fb.green.length = 8;
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s_Fb.red.length = 8;
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s_Fb.transp.length = 8;
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s_Fb.blue.offset = 0;
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s_Fb.green.offset = 8;
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s_Fb.red.offset = 16;
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s_Fb.transp.offset = 24;
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printf("I_InitGraphics: framebuffer: x_res: %d, y_res: %d, x_virtual: %d, y_virtual: %d, bpp: %d\n",
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s_Fb.xres, s_Fb.yres, s_Fb.xres_virtual, s_Fb.yres_virtual, s_Fb.bits_per_pixel);
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printf("I_InitGraphics: framebuffer: RGBA: %d%d%d%d, red_off: %d, green_off: %d, blue_off: %d, transp_off: %d\n",
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s_Fb.red.length, s_Fb.green.length, s_Fb.blue.length, s_Fb.transp.length, s_Fb.red.offset, s_Fb.green.offset, s_Fb.blue.offset, s_Fb.transp.offset);
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printf("I_InitGraphics: DOOM screen size: w x h: %d x %d\n", SCREENWIDTH, SCREENHEIGHT);
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i = M_CheckParmWithArgs("-scaling", 1);
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if (i > 0) {
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i = atoi(myargv[i + 1]);
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fb_scaling = i;
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printf("I_InitGraphics: Scaling factor: %d\n", fb_scaling);
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} else {
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fb_scaling = s_Fb.xres / SCREENWIDTH;
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if (s_Fb.yres / SCREENHEIGHT < fb_scaling)
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fb_scaling = s_Fb.yres / SCREENHEIGHT;
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printf("I_InitGraphics: Auto-scaling factor: %d\n", fb_scaling);
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}
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/* Allocate screen to draw to */
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I_VideoBuffer = (byte*)Z_Malloc (SCREENWIDTH * SCREENHEIGHT, PU_STATIC, NULL); // For DOOM to draw on
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screenvisible = true;
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extern int I_InitInput(void);
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I_InitInput();
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}
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void I_ShutdownGraphics (void)
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{
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Z_Free (I_VideoBuffer);
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}
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void I_StartFrame (void)
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{
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}
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void I_StartTic (void)
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{
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I_GetEvent();
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}
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void I_UpdateNoBlit (void)
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{
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}
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//
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// I_FinishUpdate
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//
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void I_FinishUpdate (void)
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{
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int y;
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int x_offset, y_offset, x_offset_end;
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unsigned char *line_in, *line_out;
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/* Offsets in case FB is bigger than DOOM */
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/* 600 = s_Fb heigt, 200 screenheight */
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/* 600 = s_Fb heigt, 200 screenheight */
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/* 2048 =s_Fb width, 320 screenwidth */
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y_offset = (((s_Fb.yres - (SCREENHEIGHT * fb_scaling)) * s_Fb.bits_per_pixel/8)) / 2;
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x_offset = (((s_Fb.xres - (SCREENWIDTH * fb_scaling)) * s_Fb.bits_per_pixel/8)) / 2; // XXX: siglent FB hack: /4 instead of /2, since it seems to handle the resolution in a funny way
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//x_offset = 0;
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x_offset_end = ((s_Fb.xres - (SCREENWIDTH * fb_scaling)) * s_Fb.bits_per_pixel/8) - x_offset;
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/* DRAW SCREEN */
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line_in = (unsigned char *) I_VideoBuffer;
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line_out = (unsigned char *) DG_ScreenBuffer;
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y = SCREENHEIGHT;
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while (y--)
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{
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int i;
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for (i = 0; i < fb_scaling; i++) {
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line_out += x_offset;
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#ifdef CMAP256
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for (fb_scaling == 1) {
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memcpy(line_out, line_in, SCREENWIDTH); /* fb_width is bigger than Doom SCREENWIDTH... */
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} else {
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//XXX FIXME fb_scaling support!
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}
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#else
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//cmap_to_rgb565((void*)line_out, (void*)line_in, SCREENWIDTH);
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cmap_to_fb((void*)line_out, (void*)line_in, SCREENWIDTH);
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#endif
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line_out += (SCREENWIDTH * fb_scaling * (s_Fb.bits_per_pixel/8)) + x_offset_end;
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}
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line_in += SCREENWIDTH;
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}
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DG_DrawFrame();
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}
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//
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// I_ReadScreen
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//
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void I_ReadScreen (byte* scr)
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{
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memcpy (scr, I_VideoBuffer, SCREENWIDTH * SCREENHEIGHT);
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}
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//
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// I_SetPalette
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//
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#define GFX_RGB565(r, g, b) ((((r & 0xF8) >> 3) << 11) | (((g & 0xFC) >> 2) << 5) | ((b & 0xF8) >> 3))
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#define GFX_RGB565_R(color) ((0xF800 & color) >> 11)
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#define GFX_RGB565_G(color) ((0x07E0 & color) >> 5)
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#define GFX_RGB565_B(color) (0x001F & color)
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void I_SetPalette (byte* palette)
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{
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int i;
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//col_t* c;
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//for (i = 0; i < 256; i++)
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//{
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// c = (col_t*)palette;
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// rgb565_palette[i] = GFX_RGB565(gammatable[usegamma][c->r],
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// gammatable[usegamma][c->g],
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// gammatable[usegamma][c->b]);
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// palette += 3;
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//}
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/* performance boost:
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* map to the right pixel format over here! */
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for (i=0; i<256; ++i ) {
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colors[i].a = 0;
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colors[i].r = gammatable[usegamma][*palette++];
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colors[i].g = gammatable[usegamma][*palette++];
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colors[i].b = gammatable[usegamma][*palette++];
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}
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}
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// Given an RGB value, find the closest matching palette index.
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int I_GetPaletteIndex (int r, int g, int b)
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{
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int best, best_diff, diff;
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int i;
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col_t color;
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printf("I_GetPaletteIndex\n");
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best = 0;
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best_diff = INT_MAX;
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for (i = 0; i < 256; ++i)
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{
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color.r = GFX_RGB565_R(rgb565_palette[i]);
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color.g = GFX_RGB565_G(rgb565_palette[i]);
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color.b = GFX_RGB565_B(rgb565_palette[i]);
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diff = (r - color.r) * (r - color.r)
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+ (g - color.g) * (g - color.g)
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+ (b - color.b) * (b - color.b);
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if (diff < best_diff)
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{
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best = i;
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best_diff = diff;
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}
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if (diff == 0)
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{
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break;
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}
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}
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return best;
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}
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void I_BeginRead (void)
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{
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}
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void I_EndRead (void)
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{
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}
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void I_SetWindowTitle (char *title)
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{
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DG_SetWindowTitle(title);
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}
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void I_GraphicsCheckCommandLine (void)
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{
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}
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void I_SetGrabMouseCallback (grabmouse_callback_t func)
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{
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}
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void I_EnableLoadingDisk(void)
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{
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}
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void I_BindVideoVariables (void)
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{
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}
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void I_DisplayFPSDots (boolean dots_on)
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{
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}
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void I_CheckIsScreensaver (void)
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{
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}
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