141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
#include <conf.h>
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#ifdef __ENV_DJGPP__
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#include <string.h>
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#include "gr.h"
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#include "grdef.h"
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#include "u_dpmi.h"
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#include "vesa.h"
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#define SC_INDEX 0x3c4
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#define CRTC_INDEX 0x3d4
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#define CRTC_DATA 0x3d5
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static int bankshift;
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static int lastbank;
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/* this comes from Allegro */
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typedef struct vesa_mode_info
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{
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unsigned short ModeAttributes;
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unsigned char WinAAttributes;
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unsigned char WinBAttributes;
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unsigned short WinGranularity;
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unsigned short WinSize;
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unsigned short WinASegment;
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unsigned short WinBSegment;
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unsigned long WinFuncPtr;
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unsigned short BytesPerScanLine;
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unsigned short XResolution;
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unsigned short YResolution;
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unsigned char XCharSize;
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unsigned char YCharSize;
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unsigned char NumberOfPlanes;
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unsigned char BitsPerPixel;
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unsigned char NumberOfBanks;
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unsigned char MemoryModel;
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unsigned char BankSize;
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unsigned char NumberOfImagePages;
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unsigned char Reserved_page;
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unsigned char RedMaskSize;
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unsigned char RedMaskPos;
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unsigned char GreenMaskSize;
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unsigned char GreenMaskPos;
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unsigned char BlueMaskSize;
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unsigned char BlueMaskPos;
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unsigned char ReservedMaskSize;
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unsigned char ReservedMaskPos;
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unsigned char DirectColorModeInfo;
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unsigned long PhysBasePtr;
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unsigned long OffScreenMemOffset;
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unsigned short OffScreenMemSize;
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unsigned char Reserved[206];
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} __attribute__ ((packed)) vesa_mode_info;
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int gr_vesa_checkmode(int mode) {
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int i;
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dpmi_real_regs rregs;
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vesa_mode_info *mode_info;
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if (!(mode_info = dpmi_get_temp_low_buffer( 1024 )))
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return 7;
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rregs.eax = 0x4f01;
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rregs.ecx = mode;
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rregs.edi = DPMI_real_offset(mode_info);
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rregs.es = DPMI_real_segment(mode_info);
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dpmi_real_int386x( 0x10, &rregs );
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if (rregs.eax != 0x4f)
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return 5; /* no vesa */
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if (!(mode_info->ModeAttributes & 1))
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return 4; /* unsupported mode */
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bankshift = 0;
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i = mode_info->WinGranularity;
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while (i < 64) {
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i <<= 1;
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bankshift++;
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}
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if (i != 64)
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return 2; /* incompatible window granularity */
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return 0;
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}
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int gr_vesa_setmode(int mode) {
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int ret;
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lastbank = -1;
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if ((ret = gr_vesa_checkmode(mode)))
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return ret;
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asm volatile("int $0x10" : "=a" (ret) : "a" (0x4f02), "b" (mode));
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return (ret == 0x4f) ? 0 : 4;
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}
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inline void gr_vesa_setpage(int bank) {
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if (bank != lastbank)
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asm volatile("int $0x10"
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: : "a" (0x4f05), "b" (0), "d" ((lastbank = bank) << bankshift));
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}
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void gr_vesa_incpage() {
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gr_vesa_setpage(lastbank + 1);
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}
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void gr_vesa_setstart(int col, int row) {
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asm volatile("int $0x10"
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: : "a" (0x4f07), "b" (0), "c" (col), "d" (row));
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}
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int gr_vesa_setlogical(int line_width) {
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int ret;
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asm volatile("int $0x10"
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: "=c" (ret) : "a" (0x4f07), "b" (0), "c" (line_width));
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return ret;
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}
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void gr_vesa_scanline(int x1, int x2, int y, unsigned char color) {
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int addr = (y * gr_var_bwidth) + x1;
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int left = x2 - x1 + 1;
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gr_vesa_setpage(addr >> 16);
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addr &= 0xffff;
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while (left) {
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if (left > (65536 - addr)) {
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left -= (65536 - addr);
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memset(gr_video_memory + addr, color, 65536 - addr);
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addr = 0;
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gr_vesa_incpage();
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} else {
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memset(gr_video_memory + addr, color, left);
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left = 0;
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}
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}
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}
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void gr_vesa_pixel(unsigned char color, unsigned int addr) {
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gr_vesa_setpage(addr >> 16);
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gr_video_memory[addr & 0xffff] = color;
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}
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#endif // __ENV_DJGPP__
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