LCOM1920-T5G03

#include "graphics.h"

#include "graphics_macros.h"

#include "errors.h"

#include <lcom/lcf.h>

#include <stdio.h>

static void *video_mem; /** @brief Frame-buffer VM address */

static vbe_mode_info_t vbe_mem_info;

static mmap_t mem_map;

int (get_permission)(unsigned int base_addr, unsigned int size) {

    struct minix_mem_range mmr;

    mmr.mr_base = base_addr;

    mmr.mr_limit = base_addr + size;

    return sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mmr);

}

int (get_permissions_first_mbyte)(void) {

    return get_permission(MBYTE_BASE, MBYTE_SIZE);

}

int (vbe_get_mode_information)(uint16_t mode) {

    memset(&vbe_mem_info, 0, sizeof(vbe_mode_info_t)); // reset values

    struct reg86 reg_86;

    memset(&reg_86, 0, sizeof(struct reg86)); // reset struct

    vbe_mode_info_t *virtual_addr = lm_alloc(sizeof(vbe_mode_info_t), &mem_map);

    reg_86.intno = VC_BIOS_SERV;

    reg_86.ah = VBE_CALL;

    reg_86.al = VBE_MD_INFO;

    reg_86.cx = mode;

    reg_86.es = PB2BASE(mem_map.phys);

    reg_86.di = PB2OFF(mem_map.phys);

    // BIOS CALL

    if (sys_int86(&reg_86)) {

        printf("%s: sys_int86 failed\n", __func__);

        if (free_memory()) {

            printf("%s: lm_free failed\n", __func__);

            return LCF_ERROR;

        }

        return BIOS_CALL_ERROR;

    }

    memcpy((void*)&vbe_mem_info, (void*)virtual_addr, mem_map.size);

    return SUCCESS;

}

phys_bytes get_phys_addr(void) {

    return vbe_mem_info.PhysBasePtr;

}

unsigned int get_vram_size(void) {

    return vbe_mem_info.XResolution * vbe_mem_info.YResolution * ((vbe_mem_info.BitsPerPixel + 7) >> 3);

}

uint16_t get_XRes(void) {

    return vbe_mem_info.XResolution;

}

uint16_t get_YRes(void) {

    return vbe_mem_info.YResolution;

}

uint16_t get_bits_pixel(void) {

    return vbe_mem_info.BitsPerPixel;

}

uint16_t get_bytes_pixel(void) {

    return (vbe_mem_info.BitsPerPixel + 7) >> 3;

}

int (map_vram)(void) {

    int r;

    unsigned int vram_base = get_phys_addr();

    unsigned int vram_size = get_vram_size();

    if ((r = get_permission(vram_base, vram_size)))

        panic("%s: sys_privctl (ADD MEM) failed: %d\n", __func__, r);

    video_mem = vm_map_phys(SELF, (void *)vram_base, vram_size);

    if (video_mem == MAP_FAILED)

        panic("%s: couldn't map video memory.", __func__);

    return SUCCESS;

}

int (free_memory)(void) {

    return !lm_free(&mem_map);

}

int (set_pixel)(uint16_t row, uint16_t col, uint32_t color) {

    if (row >= vbe_mem_info.XResolution || col >= vbe_mem_info.YResolution) {

        printf("%s: invalid pixel.\n", __func__);

        return OUT_OF_RANGE;

    }

    unsigned int pos = (row + col * vbe_mem_info.XResolution) * get_bytes_pixel();

    memcpy((void*)((unsigned int)video_mem + pos), &color, get_bytes_pixel());

    return SUCCESS;

}

int (set_graphics_mode)(uint16_t mode) {

    struct reg86 reg_86;

    memset(&reg_86, 0, sizeof(struct reg86)); // reset struct

    // Set Reg86

    reg_86.intno = VC_BIOS_SERV;

    reg_86.ah = VBE_CALL;

    reg_86.al = SET_VBE_MD;

    reg_86.bx = mode | LINEAR_FRAME_BUFFER_MD;

    // BIOS CALL

    if (sys_int86(&reg_86)) {

        printf("%s: sys_int86 failed\n", __func__);

        return BIOS_CALL_ERROR;

    }

    return SUCCESS;

}

int (vg_draw_hline)(uint16_t x, uint16_t y, uint16_t len, uint32_t color){

    int r;

    for (int i = 0; i < len; i++)

        if ((r = set_pixel(x + i, y, color))) return r;

    return SUCCESS;

}

int (vg_draw_rectangle)(uint16_t x, uint16_t y,uint16_t width, uint16_t height, uint32_t color)        {

    int r;

    for (int i = 0; i < height; i++)

        if ((r = vg_draw_hline(x, y + i, width, color))) return r;

    return SUCCESS;

}