rayzor

annotate src/gfx.c @ 0:2a5340a6eee4

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rayzor first commit
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 05 Apr 2014 08:46:27 +0300
parents
children 5fcf72837b69
rev   line source
nuclear@0 1 #ifndef GFX_H_
nuclear@0 2 #define GFX_H_
nuclear@0 3
nuclear@0 4 #include <stdio.h>
nuclear@0 5 #include <stdlib.h>
nuclear@0 6 #include <string.h>
nuclear@0 7 #include "vbe.h"
nuclear@0 8
nuclear@0 9 #define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) + (uint32_t)(o))
nuclear@0 10 #define VBEPTR(x) REALPTR(((x) & 0xffff0000) >> 16, (x) & 0xffff)
nuclear@0 11 #define VBEPTR_SEG(x) (((x) & 0xffff0000) >> 16)
nuclear@0 12 #define VBEPTR_OFF(x) ((x) & 0xffff)
nuclear@0 13
nuclear@0 14 #define SAME_BPP(a, b) \
nuclear@0 15 ((a) == (b) || (a) == 16 && (b) == 15 || (a) == 15 && (b) == 16 || (a) == 32 && (b) == 24 || (a) == 24 && (b) == 32)
nuclear@0 16
nuclear@0 17 static unsigned int make_mask(int sz, int pos);
nuclear@0 18
nuclear@0 19 static struct vbe_info *vbe_info;
nuclear@0 20 static struct vbe_mode_info *mode_info;
nuclear@0 21 static int pal_bits = 6;
nuclear@0 22
nuclear@0 23 void *set_video_mode(int xsz, int ysz, int bpp)
nuclear@0 24 {
nuclear@0 25 int i;
nuclear@0 26 uint16_t *modes, best = 0;
nuclear@0 27 unsigned int fbsize;
nuclear@0 28
nuclear@0 29 /* check for VBE2 support and output some info */
nuclear@0 30 if(!vbe_info) {
nuclear@0 31 if(!(vbe_info = vbe_get_info())) {
nuclear@0 32 fprintf(stderr, "VESA BIOS Extensions not available\n");
nuclear@0 33 return 0;
nuclear@0 34 }
nuclear@0 35
nuclear@0 36 printf("VBE Version: %x.%x\n", vbe_info->version >> 8, vbe_info->version & 0xff);
nuclear@0 37 if(vbe_info->version < 0x200) {
nuclear@0 38 fprintf(stderr, "This program requires VBE 2.0 or greater. Try running UniVBE\n");
nuclear@0 39 return 0;
nuclear@0 40 }
nuclear@0 41
nuclear@0 42 printf("Graphics adapter: %s, %s (%s)\n", VBEPTR(vbe_info->oem_vendor_name_ptr),
nuclear@0 43 VBEPTR(vbe_info->oem_product_name_ptr), VBEPTR(vbe_info->oem_product_rev_ptr));
nuclear@0 44 printf("Video memory: %dmb\n", vbe_info->total_mem << 6);
nuclear@0 45
nuclear@0 46 modes = VBEPTR(vbe_info->vid_mode_ptr);
nuclear@0 47 }
nuclear@0 48
nuclear@0 49 for(i=0; i<1024; i++) { /* impose an upper limit to avoid inf-loops */
nuclear@0 50 if(modes[i] == 0xffff) {
nuclear@0 51 break; /* reached the end */
nuclear@0 52 }
nuclear@0 53
nuclear@0 54 mode_info = vbe_get_mode_info(modes[i] | VBE_MODE_LFB);
nuclear@0 55 if(!mode_info || mode_info->xres != xsz || mode_info->yres != ysz) {
nuclear@0 56 continue;
nuclear@0 57 }
nuclear@0 58 if(SAME_BPP(mode_info->bpp, bpp)) {
nuclear@0 59 best = modes[i];
nuclear@0 60 }
nuclear@0 61 }
nuclear@0 62
nuclear@0 63 if(best) {
nuclear@0 64 mode_info = vbe_get_mode_info(best);
nuclear@0 65 } else {
nuclear@0 66 fprintf(stderr, "Requested video mode (%dx%d %dbpp) is unavailable\n", xsz, ysz, bpp);
nuclear@0 67 return 0;
nuclear@0 68 }
nuclear@0 69
nuclear@0 70 if(vbe_set_mode(best | VBE_MODE_LFB) == -1) {
nuclear@0 71 fprintf(stderr, "Failed to set video mode %dx%d %dbpp\n", mode_info->xres, mode_info->yres, mode_info->bpp);
nuclear@0 72 return 0;
nuclear@0 73 }
nuclear@0 74
nuclear@0 75 /* attempt to set 8 bits of color per component in palettized modes */
nuclear@0 76 if(bpp <= 8) {
nuclear@0 77 pal_bits = vbe_set_palette_bits(8);
nuclear@0 78 printf("palette bits per color primary: %d\n", pal_bits);
nuclear@0 79 }
nuclear@0 80
nuclear@0 81 fbsize = xsz * ysz * mode_info->num_img_pages * (bpp / CHAR_BIT);
nuclear@0 82 return (void*)dpmi_mmap(mode_info->fb_addr, fbsize);
nuclear@0 83 }
nuclear@0 84
nuclear@0 85 int set_text_mode(void)
nuclear@0 86 {
nuclear@0 87 vbe_set_mode(0x3);
nuclear@0 88 return 0;
nuclear@0 89 }
nuclear@0 90
nuclear@0 91 int get_color_depth(void)
nuclear@0 92 {
nuclear@0 93 if(!mode_info) {
nuclear@0 94 return -1;
nuclear@0 95 }
nuclear@0 96 return mode_info->bpp;
nuclear@0 97 }
nuclear@0 98
nuclear@0 99 int get_color_bits(int *rbits, int *gbits, int *bbits)
nuclear@0 100 {
nuclear@0 101 if(!mode_info) {
nuclear@0 102 return -1;
nuclear@0 103 }
nuclear@0 104 *rbits = mode_info->rmask_size;
nuclear@0 105 *gbits = mode_info->gmask_size;
nuclear@0 106 *bbits = mode_info->bmask_size;
nuclear@0 107 return 0;
nuclear@0 108 }
nuclear@0 109
nuclear@0 110 int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask)
nuclear@0 111 {
nuclear@0 112 if(!mode_info) {
nuclear@0 113 return -1;
nuclear@0 114 }
nuclear@0 115 *rmask = make_mask(mode_info->rmask_size, mode_info->rpos);
nuclear@0 116 *gmask = make_mask(mode_info->gmask_size, mode_info->gpos);
nuclear@0 117 *bmask = make_mask(mode_info->bmask_size, mode_info->bpos);
nuclear@0 118 return 0;
nuclear@0 119 }
nuclear@0 120
nuclear@0 121 int get_color_shift(int *rshift, int *gshift, int *bshift)
nuclear@0 122 {
nuclear@0 123 if(!mode_info) {
nuclear@0 124 return -1;
nuclear@0 125 }
nuclear@0 126 *rshift = mode_info->rpos;
nuclear@0 127 *gshift = mode_info->gpos;
nuclear@0 128 *bshift = mode_info->bpos;
nuclear@0 129 return 0;
nuclear@0 130 }
nuclear@0 131
nuclear@0 132 void set_palette(int idx, int r, int g, int b)
nuclear@0 133 {
nuclear@0 134 int col[3];
nuclear@0 135 col[0] = r;
nuclear@0 136 col[1] = g;
nuclear@0 137 col[2] = b;
nuclear@0 138 vbe_set_palette(idx, col, 1, pal_bits);
nuclear@0 139 }
nuclear@0 140
nuclear@0 141 static unsigned int make_mask(int sz, int pos)
nuclear@0 142 {
nuclear@0 143 unsigned int i, mask = 0;
nuclear@0 144
nuclear@0 145 for(i=0; i<sz; i++) {
nuclear@0 146 mask |= 1 << i;
nuclear@0 147 }
nuclear@0 148 return mask << pos;
nuclear@0 149 }
nuclear@0 150
nuclear@0 151
nuclear@0 152 #endif /* GFX_H_ */