318 lines
6.1 KiB
C
318 lines
6.1 KiB
C
/* SVGALib video functions */
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#include <conf.h>
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#ifdef SVGALIB_VIDEO
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <vga.h>
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#include <vgagl.h>
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#include "gr.h"
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#include "grdef.h"
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#include "palette.h"
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#include "u_mem.h"
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#include "error.h"
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#ifdef SVGALIB_INPUT
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#include <vgamouse.h>
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#endif
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#include "gamefont.h"
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int gr_installed = 0;
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int usebuffer;
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extern void mouse_handler (int button, int dx, int dy, int dz, int drx, int dry, int drz);
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GraphicsContext *physicalscreen, *screenbuffer;
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void gr_update()
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{
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if (usebuffer)
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gl_copyscreen(physicalscreen);
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}
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int gr_set_mode(u_int32_t mode)
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{
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unsigned int w, h;
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char vgamode[16];
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vga_modeinfo *modeinfo;
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int modenum, rowsize;
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void *framebuffer;
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#ifdef NOGRAPH
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return 0;
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#endif
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if (mode<=0)
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return 0;
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w=SM_W(mode);
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h=SM_H(mode);
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gr_palette_clear();
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sprintf(vgamode, "G%dx%dx256", w, h);
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modenum = vga_getmodenumber(vgamode);
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vga_setmode(modenum);
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#ifdef SVGALIB_INPUT
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mouse_seteventhandler(mouse_handler);
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#endif
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modeinfo = vga_getmodeinfo(modenum);
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if (modeinfo->flags & CAPABLE_LINEAR)
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{
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usebuffer = 0;
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vga_setlinearaddressing();
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// Set up physical screen only
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gl_setcontextvga(modenum);
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physicalscreen = gl_allocatecontext();
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gl_getcontext(physicalscreen);
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screenbuffer = physicalscreen;
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framebuffer = physicalscreen->vbuf;
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rowsize = physicalscreen->bytewidth;
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}
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else
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{
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usebuffer = 1;
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// Set up the physical screen
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gl_setcontextvga(modenum);
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physicalscreen = gl_allocatecontext();
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gl_getcontext(physicalscreen);
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// Set up the virtual screen
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gl_setcontextvgavirtual(modenum);
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screenbuffer = gl_allocatecontext();
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gl_getcontext(screenbuffer);
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framebuffer = screenbuffer->vbuf;
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rowsize = screenbuffer->bytewidth;
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}
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memset(grd_curscreen, 0, sizeof(grs_screen));
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grd_curscreen->sc_mode = mode;
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grd_curscreen->sc_w = w;
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grd_curscreen->sc_h = h;
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grd_curscreen->sc_aspect = fixdiv(grd_curscreen->sc_w*3,grd_curscreen->sc_h*4);
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grd_curscreen->sc_canvas.cv_bitmap.bm_x = 0;
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grd_curscreen->sc_canvas.cv_bitmap.bm_y = 0;
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grd_curscreen->sc_canvas.cv_bitmap.bm_w = w;
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grd_curscreen->sc_canvas.cv_bitmap.bm_h = h;
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grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = rowsize;
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grd_curscreen->sc_canvas.cv_bitmap.bm_type = BM_LINEAR;
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grd_curscreen->sc_canvas.cv_bitmap.bm_data = framebuffer;
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gr_set_current_canvas(NULL);
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//gamefont_choose_game_font(w,h);
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return 0;
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}
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int gr_init(void)
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{
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int retcode;
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int mode = SM(320,200);
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// Only do this function once!
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if (gr_installed==1)
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return -1;
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MALLOC(grd_curscreen,grs_screen, 1);
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memset(grd_curscreen, 0, sizeof(grs_screen));
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vga_init();
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if ((retcode=gr_set_mode(mode)))
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return retcode;
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grd_curscreen->sc_canvas.cv_color = 0;
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grd_curscreen->sc_canvas.cv_drawmode = 0;
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grd_curscreen->sc_canvas.cv_font = NULL;
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grd_curscreen->sc_canvas.cv_font_fg_color = 0;
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grd_curscreen->sc_canvas.cv_font_bg_color = 0;
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gr_set_current_canvas( &grd_curscreen->sc_canvas );
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gr_installed = 1;
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atexit(gr_close);
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return 0;
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}
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void gr_close ()
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{
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if (gr_installed==1)
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{
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gr_installed = 0;
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free(grd_curscreen);
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gl_freecontext(screenbuffer);
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gl_freecontext(physicalscreen);
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}
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}
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// Palette functions follow.
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static int last_r=0, last_g=0, last_b=0;
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void gr_palette_clear ()
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{
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int colors[768];
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memset (colors, 0, 768 * sizeof(int));
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vga_setpalvec (0, 256, colors);
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gr_palette_faded_out = 1;
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}
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void gr_palette_step_up (int r, int g, int b)
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{
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int i = 0;
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ubyte *p = gr_palette;
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int temp;
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int colors[768];
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if (gr_palette_faded_out) return;
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if ((r==last_r) && (g==last_g) && (b==last_b)) return;
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last_r = r;
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last_g = g;
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last_b = b;
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while (i < 768)
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{
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temp = (int)(*p++) + r + gr_palette_gamma;
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if (temp<0) temp=0;
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else if (temp>63) temp=63;
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colors[i++] = temp;
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temp = (int)(*p++) + g + gr_palette_gamma;
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if (temp<0) temp=0;
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else if (temp>63) temp=63;
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colors[i++] = temp;
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temp = (int)(*p++) + b + gr_palette_gamma;
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if (temp<0) temp=0;
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else if (temp>63) temp=63;
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colors[i++] = temp;
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}
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vga_setpalvec (0, 256, colors);
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}
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//added on 980913 by adb to fix palette problems
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// need a min without side effects...
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#undef min
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static inline int min(int x, int y) { return x < y ? x : y; }
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//end changes by adb
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void gr_palette_load (ubyte *pal)
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{
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int i;
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int colors[768];
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for (i = 0; i < 768; i++)
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{
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gr_current_pal[i] = pal[i];
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if (gr_current_pal[i] > 63) gr_current_pal[i] = 63;
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colors[i] = (min(gr_current_pal[i] + gr_palette_gamma, 63));
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}
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vga_setpalvec (0, 256, colors);
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gr_palette_faded_out = 0;
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init_computed_colors();
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}
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int gr_palette_fade_out (ubyte *pal, int nsteps, int allow_keys)
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{
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int i, j;
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ubyte c;
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fix fade_palette[768];
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fix fade_palette_delta[768];
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int fade_colors[768];
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if (gr_palette_faded_out) return 0;
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if (pal==NULL) pal=gr_current_pal;
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for (i=0; i<768; i++)
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{
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gr_current_pal[i] = pal[i];
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fade_palette[i] = i2f(pal[i]);
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fade_palette_delta[i] = fade_palette[i] / nsteps;
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}
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for (j=0; j<nsteps; j++)
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{
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for (i = 0; i < 768; i++)
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{
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fade_palette[i] -= fade_palette_delta[i];
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if (fade_palette[i] > i2f(pal[i] + gr_palette_gamma))
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fade_palette[i] = i2f(pal[i] + gr_palette_gamma);
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c = f2i(fade_palette[i]);
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if (c > 63) c = 63;
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fade_colors[i] = c;
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}
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vga_setpalvec (0, 256, fade_colors);
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}
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gr_palette_faded_out = 1;
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return 0;
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}
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int gr_palette_fade_in (ubyte *pal, int nsteps, int allow_keys)
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{
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int i, j;
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ubyte c;
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fix fade_palette[768];
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fix fade_palette_delta[768];
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int fade_colors[768];
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if (!gr_palette_faded_out) return 0;
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for (i=0; i<768; i++)
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{
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gr_current_pal[i] = pal[i];
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fade_palette[i] = 0;
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fade_palette_delta[i] = i2f(pal[i] + gr_palette_gamma) / nsteps;
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}
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for (j=0; j<nsteps; j++ )
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{
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for (i = 0; i < 768; i++ )
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{
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fade_palette[i] += fade_palette_delta[i];
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if (fade_palette[i] > i2f(pal[i] + gr_palette_gamma))
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fade_palette[i] = i2f(pal[i] + gr_palette_gamma);
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c = f2i(fade_palette[i]);
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if (c > 63) c = 63;
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fade_colors[i] = c;
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}
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vga_setpalvec (0, 256, fade_colors);
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}
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gr_palette_faded_out = 0;
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return 0;
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}
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void gr_palette_read (ubyte *pal)
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{
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int colors[768];
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int i;
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vga_getpalvec (0, 256, colors);
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for (i = 0; i < 768; i++)
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pal[i] = colors[i];
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}
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#endif /* SVGALIB_VIDEO */
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