X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=src%2Fdos%2Fgfx.c;h=bc763d3158df9117ec6979097b2409e7288970f7;hp=c2e4f8decd2f974b92cf0ddbbcfdb3ae1a3d2221;hb=102f82ec5a8128cb076371aa3d9821e684b94380;hpb=62c84af3483abd59e3b6672559b19a9ea17ff14d diff --git a/src/dos/gfx.c b/src/dos/gfx.c index c2e4f8d..bc763d3 100644 --- a/src/dos/gfx.c +++ b/src/dos/gfx.c @@ -1,168 +1,137 @@ -#ifndef GFX_H_ -#define GFX_H_ - #include -#include #include -#include +#include "gfx.h" #include "vbe.h" +#include "vga.h" #include "cdpmi.h" -#ifdef __DJGPP__ -#include +#define SAME_BPP(a, b) \ + ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \ + ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32)) -#define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) - __djgpp_base_address + (uint32_t)(o)) -#else -#define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) + (uint32_t)(o)) -#endif +static int vbe_init_ver; +static struct vbe_info vbe; +static int mode, pgsize, fbsize; +static struct vbe_mode_info mode_info; -#define VBEPTR(x) REALPTR(((x) & 0xffff0000) >> 16, (x) & 0xffff) -#define VBEPTR_SEG(x) (((x) & 0xffff0000) >> 16) -#define VBEPTR_OFF(x) ((x) & 0xffff) +static void *vpgaddr[2]; +static int fbidx; +static int pgcount; -#define SAME_BPP(a, b) \ - ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \ - ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32)) +static int init_vbe(void) +{ + int i, num; -static unsigned int make_mask(int sz, int pos); + if(vbe_info(&vbe) == -1) { + fprintf(stderr, "failed to retrieve VBE information\n"); + return -1; + } -static struct vbe_info *vbe_info; -static struct vbe_mode_info *mode_info; -static int pal_bits = 6; + vbe_print_info(stdout, &vbe); -void *set_video_mode(int xsz, int ysz, int bpp) -{ - int i; - static uint16_t *modes; - uint16_t best = 0; - unsigned int fbsize; - -#ifdef __DJGPP__ - __djgpp_nearptr_enable(); -#endif - - /* check for VBE2 support and output some info */ - if(!vbe_info) { - if(!(vbe_info = vbe_get_info())) { - fprintf(stderr, "VESA BIOS Extensions not available\n"); - return 0; - } + num = vbe_num_modes(&vbe); + for(i=0; iversion >> 8, vbe_info->version & 0xff); - if(vbe_info->version < 0x200) { - fprintf(stderr, "This program requires VBE 2.0 or greater. Try running UniVBE\n"); - return 0; + if(vbe_mode_info(vbe.modes[i], &minf) == -1) { + continue; } + printf("%04x: ", vbe.modes[i]); + vbe_print_mode_info(stdout, &minf); + } + fflush(stdout); - printf("Graphics adapter: %s, %s (%s)\n", (char*)VBEPTR(vbe_info->oem_vendor_name_ptr), - (char*)VBEPTR(vbe_info->oem_product_name_ptr), (char*)VBEPTR(vbe_info->oem_product_rev_ptr)); - printf("Video memory: %dkb\n", vbe_info->total_mem << 6); + vbe_init_ver = VBE_VER_MAJOR(vbe.ver); + return 0; +} - modes = VBEPTR(vbe_info->vid_mode_ptr); - } +void *set_video_mode(int xsz, int ysz, int bpp, int nbuf) +{ + int i, nmodes; + int best_match_mode = -1; + struct vbe_mode_info minf; - for(i=0; i<1024; i++) { /* impose an upper limit to avoid inf-loops */ - if(modes[i] == 0xffff) { - break; /* reached the end */ + if(!vbe_init_ver) { + if(init_vbe() == -1) { + fprintf(stderr, "failed to initialize VBE\n"); + return 0; + } + if(vbe_init_ver < 2) { + fprintf(stderr, "VBE >= 2.0 required\n"); + return 0; } + } - mode_info = vbe_get_mode_info(modes[i] | VBE_MODE_LFB); - if(!mode_info || mode_info->xres != xsz || mode_info->yres != ysz) { + mode = -1; + nmodes = vbe_num_modes(&vbe); + for(i=0; ibpp, bpp)) { - best = modes[i]; + if(minf.xres != xsz || minf.yres != ysz) continue; + if(minf.bpp == bpp) { + mode = vbe.modes[i]; + break; + } + if(SAME_BPP(minf.bpp, bpp)) { + best_match_mode = mode; } } - if(best) { - mode_info = vbe_get_mode_info(best); - } else { - fprintf(stderr, "Requested video mode (%dx%d %dbpp) is unavailable\n", xsz, ysz, bpp); - return 0; + if(mode == -1) { + if(best_match_mode == -1) { + fprintf(stderr, "failed to find requested video mode (%dx%d %d bpp)\n", xsz, ysz, bpp); + return 0; + } + mode = best_match_mode; } - if(vbe_set_mode(best | VBE_MODE_LFB) == -1) { - fprintf(stderr, "Failed to set video mode %dx%d %dbpp\n", mode_info->xres, mode_info->yres, mode_info->bpp); + vbe_mode_info(mode, &mode_info); + printf("setting video mode %x: (%dx%d %d)\n", (unsigned int)mode, mode_info.xres, + mode_info.yres, mode_info.bpp); + + if(vbe_setmode(mode | VBE_MODE_LFB) == -1) { + fprintf(stderr, "failed to set video mode\n"); return 0; } - /* attempt to set 8 bits of color per component in palettized modes */ - /*if(bpp <= 8) { - pal_bits = vbe_set_palette_bits(8); - printf("palette bits per color primary: %d\n", pal_bits); - } - */ + if(nbuf < 1) nbuf = 1; + if(nbuf > 2) nbuf = 2; + pgcount = nbuf > mode_info.num_img_pages ? mode_info.num_img_pages : nbuf; - fbsize = xsz * ysz * mode_info->num_img_pages * (bpp / CHAR_BIT); - return (void*)dpmi_mmap(mode_info->fb_addr, fbsize); -} + pgsize = mode_info.xres * mode_info.yres * (bpp / 8); + fbsize = pgcount * pgsize; -int set_text_mode(void) -{ - vbe_set_mode(0x3); - return 0; -} + vpgaddr[0] = (void*)dpmi_mmap(mode_info.fb_addr, fbsize); + memset(vpgaddr[0], 0xaa, fbsize); -int get_color_depth(void) -{ - if(!mode_info) { - return -1; + if(pgcount > 1) { + vpgaddr[1] = (char*)vpgaddr[0] + pgsize; + fbidx = 1; + page_flip(FLIP_NOW); /* start with the second page visible */ + } else { + fbidx = 0; + vpgaddr[1] = 0; } - return mode_info->bpp; -} -int get_color_bits(int *rbits, int *gbits, int *bbits) -{ - if(!mode_info) { - return -1; - } - *rbits = mode_info->rmask_size; - *gbits = mode_info->gmask_size; - *bbits = mode_info->bmask_size; - return 0; + return vpgaddr[0]; } -int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask) +int set_text_mode(void) { - if(!mode_info) { - return -1; - } - *rmask = make_mask(mode_info->rmask_size, mode_info->rpos); - *gmask = make_mask(mode_info->gmask_size, mode_info->gpos); - *bmask = make_mask(mode_info->bmask_size, mode_info->bpos); + vga_setmode(3); return 0; } -int get_color_shift(int *rshift, int *gshift, int *bshift) +void *page_flip(int vsync) { - if(!mode_info) { - return -1; + if(!vpgaddr[1]) { + /* page flipping not supported */ + return vpgaddr[0]; } - *rshift = mode_info->rpos; - *gshift = mode_info->gpos; - *bshift = mode_info->bpos; - return 0; -} - -void set_palette(int idx, int r, int g, int b) -{ - int col[3]; - col[0] = r; - col[1] = g; - col[2] = b; - vbe_set_palette(idx, col, 1, pal_bits); -} -static unsigned int make_mask(int sz, int pos) -{ - unsigned int i, mask = 0; + vbe_swap(fbidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW); + fbidx = (fbidx + 1) & 1; - for(i=0; i