vgaSetMode(VGA_256_COLOR_MODE);\r
vga_enable_256color_modex();\r
\r
- update_state_from_vga_();\r
+ update_state_from_vga();\r
vga_read_crtc_mode(&cm);\r
\r
/* reprogram the CRT controller */\r
printf("\n");\r
}\r
}\r
-\r
-void update_state_from_vga_() {\r
- unsigned char c;\r
-\r
- vga_state.vga_pos_x = 0;\r
- vga_state.vga_pos_y = 0;\r
- vga_state.vga_stride = 80;\r
- vga_state.vga_height = 25;\r
- vga_state.vga_width = 80;\r
- vga_state.vga_9wide = 1;\r
-\r
- if (vga_state.vga_flags & VGA_IS_VGA) { /* VGA only. EGA cards DO have the misc. output reg but it's write-only */\r
- /* update state from H/W which I/O port */\r
- c = inp(0x3CC);\r
- if (c & 1) {\r
- vga_state.vga_base_3x0 = 0x3D0;\r
- }\r
- else {\r
- vga_state.vga_base_3x0 = 0x3B0;\r
- }\r
-\r
- /* now ask the graphics controller where/how VGA memory is mapped */\r
- c = vga_read_GC(6);\r
- /* bit 0 = alpha disable (if set, graphics) */\r
- vga_state.vga_alpha_mode = ((c & 1) == 0);\r
- /* bits 2-3 memory map select */\r
- update_state_vga_memory_map_select((c>>2)&3);\r
-\r
- /* read the sequencer: are we in 8 or 9 dot mode? */\r
- c = vga_read_sequencer(0x1);\r
- vga_state.vga_9wide = (c & 1) == 0;\r
-\r
- /* read from the CRTC controller the stride, width, and height */\r
- vga_state.vga_stride = vga_read_CRTC(0x13) * 2; /* "offset" register */\r
- if (vga_state.vga_alpha_mode) {\r
- vga_state.vga_width = vga_state.vga_stride;\r
- vga_sync_hw_cursor();\r
- /* TODO: read vertical blank values and calculate active area, then divide by scan line height, to get alpha height */\r
- /* TODO: read horizontal blank values to calculate active area, then visible width */\r
- }\r
- else {\r
- /* TODO: similar semantics for graphics mode */\r
- }\r
- }\r
- else if (vga_state.vga_flags & VGA_IS_EGA) {\r
- /* Well the EGA has similar registers BUT they aren't readable. So we have to\r
- * guess based on other information handed to us */\r
-\r
- /* reading the misc. output register doesn't work, use BIOS data area */\r
- c = *((unsigned char far*)MK_FP(0x40,0x63));\r
- if ((c&0xF0) == 0xD0)\r
- vga_state.vga_base_3x0 = 0x3D0;\r
- else if ((c&0xF0) == 0xB0)\r
- vga_state.vga_base_3x0 = 0x3B0;\r
- else {\r
- vga_state.vga_base_3x0 = 0x3D0;\r
- }\r
-\r
- /* reading from the graphics controller (0x3CE) doesn't work, deduce from BIOS mode */\r
- c = int10_getmode();\r
- switch (c) {\r
- case 0: case 1: case 2: case 3: case 7:\r
- vga_state.vga_alpha_mode = 1;\r
-\r
- /* the best we can do is assume B0000 if CRTC is at 3Bx or B8000 if at 3Dx even though it's possible to map at B8000 and 3Bx */\r
- if (vga_state.vga_base_3x0 == 0x3B0)\r
- update_state_vga_memory_map_select(2);\r
- else\r
- update_state_vga_memory_map_select(3);\r
- break;\r
- case 4: case 5: case 6:\r
- vga_state.vga_alpha_mode = 0;\r
- update_state_vga_memory_map_select(3);\r
- break;\r
- case 13: case 14: case 15: case 16: case 17: case 18: default:\r
- vga_state.vga_alpha_mode = 0;\r
- update_state_vga_memory_map_select(1);\r
- break;\r
- }\r
-\r
- /* read from the CRTC controller the stride, width, and height */\r
- vga_state.vga_stride = vga_read_CRTC(0x13) * 2; /* "offset" register */\r
- if (vga_state.vga_alpha_mode) {\r
- vga_state.vga_width = vga_state.vga_stride;\r
- vga_sync_hw_cursor();\r
- /* TODO: read vertical blank values and calculate active area, then divide by scan line height, to get alpha height */\r
- /* TODO: read horizontal blank values to calculate active area, then visible width */\r
- }\r
- else {\r
- /* TODO: similar semantics for graphics mode */\r
- }\r
- }\r
- else if (vga_state.vga_flags & VGA_IS_CGA) {\r
- vga_state.vga_base_3x0 = 0x3D0; /* always at 0x3Dx */\r
-\r
- /* TODO: If Tandy, detect state */\r
-\r
- /* read the status register to determine the state of the CGA... oh wait... we can't.\r
- * fine. deduce it from the BIOS video mode. */\r
- c = int10_getmode();\r
- switch (c) {\r
- case 0: case 1: case 2: case 3: case 7:\r
- vga_state.vga_alpha_mode = 1;\r
- break;\r
- default:\r
- vga_state.vga_alpha_mode = 0;\r
- break;\r
- }\r
-\r
- if (c <= 1) {\r
- vga_state.vga_stride = 40;\r
- vga_state.vga_width = 40;\r
- }\r
-\r
- update_state_vga_memory_map_select(3); /* 0xB8000 */\r
- }\r
- else if (vga_state.vga_flags & VGA_IS_MDA) {\r
- vga_state.vga_base_3x0 = 0x3B0; /* always at 0x3Bx */\r
- vga_state.vga_alpha_mode = 1; /* stock MDA doesn't have graphics */\r
-\r
- /* Hercules MDA: It would be nice to be able to read bit 2 of the display control,\r
- * except that the port is write-only. Thanks >:( */\r
- update_state_vga_memory_map_select(2); /* 0xB0000 */\r
- }\r
-\r
- vga_state.vga_draw_stride_limit = vga_state.vga_draw_stride = vga_state.vga_stride;\r
-}\r