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1 #ifndef GFX_H_
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2 #define GFX_H_
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3
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4 #include <stdio.h>
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5 #include <stdlib.h>
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6 #include <string.h>
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7 #include "vbe.h"
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8 #include "logger.h"
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9
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10 #define REALPTR(s, o) (void*)(((uint32_t)(s) << 4) + (uint32_t)(o))
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11 #define VBEPTR(x) REALPTR(((x) & 0xffff0000) >> 16, (x) & 0xffff)
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12 #define VBEPTR_SEG(x) (((x) & 0xffff0000) >> 16)
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13 #define VBEPTR_OFF(x) ((x) & 0xffff)
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14
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15 #define SAME_BPP(a, b) \
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16 ((a) == (b) || (a) == 16 && (b) == 15 || (a) == 15 && (b) == 16 || (a) == 32 && (b) == 24 || (a) == 24 && (b) == 32)
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17
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18 static unsigned int make_mask(int sz, int pos);
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19
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20 static struct vbe_info *vbe_info;
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21 static struct vbe_mode_info *mode_info;
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22 static int pal_bits = 6;
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23
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24 void *set_video_mode(int xsz, int ysz, int bpp)
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25 {
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26 int i;
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27 uint16_t *modes, best = 0;
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28 unsigned int fbsize;
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29
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30 /* check for VBE2 support and output some info */
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31 if(!vbe_info) {
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32 if(!(vbe_info = vbe_get_info())) {
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33 fprintf(stderr, "VESA BIOS Extensions not available\n");
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34 return 0;
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35 }
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36
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37 printlog("VBE Version: %x.%x\n", vbe_info->version >> 8, vbe_info->version & 0xff);
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38 if(vbe_info->version < 0x200) {
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39 fprintf(stderr, "This program requires VBE 2.0 or greater. Try running UniVBE\n");
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40 return 0;
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41 }
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42
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43 printlog("Graphics adapter: %s, %s (%s)\n", VBEPTR(vbe_info->oem_vendor_name_ptr),
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44 VBEPTR(vbe_info->oem_product_name_ptr), VBEPTR(vbe_info->oem_product_rev_ptr));
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45 printlog("Video memory: %dmb\n", vbe_info->total_mem << 6);
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46
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47 modes = VBEPTR(vbe_info->vid_mode_ptr);
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48 }
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49
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50 for(i=0; i<1024; i++) { /* impose an upper limit to avoid inf-loops */
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51 if(modes[i] == 0xffff) {
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52 break; /* reached the end */
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53 }
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54
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55 mode_info = vbe_get_mode_info(modes[i] | VBE_MODE_LFB);
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56 if(!mode_info || mode_info->xres != xsz || mode_info->yres != ysz) {
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57 continue;
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58 }
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59 if(SAME_BPP(mode_info->bpp, bpp)) {
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60 best = modes[i];
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61 }
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62 }
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63
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64 if(best) {
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65 mode_info = vbe_get_mode_info(best);
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66 } else {
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67 fprintf(stderr, "Requested video mode (%dx%d %dbpp) is unavailable\n", xsz, ysz, bpp);
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68 return 0;
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69 }
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70
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71 if(vbe_set_mode(best | VBE_MODE_LFB) == -1) {
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72 fprintf(stderr, "Failed to set video mode %dx%d %dbpp\n", mode_info->xres, mode_info->yres, mode_info->bpp);
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73 return 0;
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74 }
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75
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76 /* attempt to set 8 bits of color per component in palettized modes */
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77 if(bpp <= 8) {
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78 pal_bits = vbe_set_palette_bits(8);
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79 printlog("palette bits per color primary: %d\n", pal_bits);
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80 }
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81
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82 fbsize = xsz * ysz * mode_info->num_img_pages * (bpp / CHAR_BIT);
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83 return (void*)dpmi_mmap(mode_info->fb_addr, fbsize);
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84 }
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85
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86 int set_text_mode(void)
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87 {
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88 vbe_set_mode(0x3);
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89 return 0;
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90 }
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91
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92 int get_color_depth(void)
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93 {
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94 if(!mode_info) {
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95 return -1;
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96 }
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97 return mode_info->bpp;
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98 }
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99
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100 int get_color_bits(int *rbits, int *gbits, int *bbits)
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101 {
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102 if(!mode_info) {
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103 return -1;
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104 }
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105 *rbits = mode_info->rmask_size;
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106 *gbits = mode_info->gmask_size;
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107 *bbits = mode_info->bmask_size;
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108 return 0;
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109 }
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110
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111 int get_color_mask(unsigned int *rmask, unsigned int *gmask, unsigned int *bmask)
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112 {
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113 if(!mode_info) {
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114 return -1;
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115 }
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116 *rmask = make_mask(mode_info->rmask_size, mode_info->rpos);
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117 *gmask = make_mask(mode_info->gmask_size, mode_info->gpos);
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118 *bmask = make_mask(mode_info->bmask_size, mode_info->bpos);
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119 return 0;
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120 }
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121
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122 int get_color_shift(int *rshift, int *gshift, int *bshift)
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123 {
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124 if(!mode_info) {
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125 return -1;
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126 }
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127 *rshift = mode_info->rpos;
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128 *gshift = mode_info->gpos;
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129 *bshift = mode_info->bpos;
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130 return 0;
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131 }
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132
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133 void set_palette(int idx, int r, int g, int b)
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134 {
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135 int col[3];
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136 col[0] = r;
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137 col[1] = g;
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138 col[2] = b;
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139 vbe_set_palette(idx, col, 1, pal_bits);
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140 }
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141
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142 void wait_vsync(void)
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143 {
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144 /* TODO */
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145 }
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146
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147 static unsigned int make_mask(int sz, int pos)
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148 {
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149 unsigned int i, mask = 0;
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150
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151 for(i=0; i<sz; i++) {
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152 mask |= 1 << i;
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153 }
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154 return mask << pos;
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155 }
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156
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157
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158 #endif /* GFX_H_ */
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