LCOM1920-T5G03

#include <lcom/lcf.h>

#include "graph.h"

#include "errors.h"

#include <stdio.h>

#define VC_BIOS_SERV  0x10 /** @brief Interrupt service of video card */

#define VBE_CALL      0x4F /** @brief VBE call function specifier */

#define MBYTE_BASE  0x0         /** @brief Base address (zero address) */

#define MBYTE_SIZE  0xFFFFF     /** @brief Size of a mebibyte */

#define LINEAR_FRAME_BUFFER_MD  BIT(14)

// Graphics Functions

#define VBE_CTRL_INFO       0x00    /** @brief Get VBE Controller Information */

#define VBE_MD_INFO         0x01    /** @brief Get VBE Mode Information */

#define SET_VBE_MD          0x02    /** @brief Set VBE Mode */

// Error codes (AH)

#define AH_SUCCESS          0x00    /** @brief Success code on BIOS call */

#define AH_FUNC_CALL_FAIL   0x01    /** @brief Function call failed */

#define AH_FUNC_NOT_SUPP    0x02    /** @brief Function call is not supported in current HW configuration */

#define AH_FUNC_INVALID     0x03    /** @brief Invalid function in current video mode */

/// MACROS

#define FAR2PHYS(n)         ((((n)>>12) & 0xFFFFFFF0) + ((n) & 0x0000FFFF))

/// STRUCT

typedef struct __attribute__((packed)) {

    char        VbeSignature[4]     ;

    uint16_t    VbeVersion          ;

    uint32_t    OemStringPtr        ;

    uint8_t     Capabilities[4]     ;

    uint32_t    VideoModePtr        ;

    uint16_t    TotalMemory         ;

    uint16_t    OemSoftwareRev      ;

    uint32_t    OemVendorNamePtr    ;

    uint32_t    OemProductNamePtr   ;

    uint32_t    OemProductRevPtr    ;

    char        Reserved[222]       ;

    char        OemData[256]        ;

} VbeInfoBlock;

static vbe_mode_info_t vbe_mem_info;

/// PRIVATE GET

static uint16_t   (graph_get_bits_pixel)   (void){ return vbe_mem_info.BitsPerPixel; }

static phys_bytes (graph_get_phys_addr)    (void){ return vbe_mem_info.PhysBasePtr; }

static unsigned   (graph_get_vram_size)    (void){ return vbe_mem_info.XResolution * vbe_mem_info.YResolution * graph_get_bytes_pixel(); }

//static uint16_t   (graph_get_RedMaskSize)  (void){ return vbe_mem_info.RedMaskSize  ; }

//static uint16_t   (graph_get_GreenMaskSize)(void){ return vbe_mem_info.GreenMaskSize; }

//static uint16_t   (graph_get_BlueMaskSize) (void){ return vbe_mem_info.BlueMaskSize ; }

/// PUBLIC GET

uint16_t   (graph_get_XRes)         (void){ return vbe_mem_info.XResolution; }

uint16_t   (graph_get_YRes)         (void){ return vbe_mem_info.YResolution; }

uint16_t   (graph_get_bytes_pixel)  (void){ return (graph_get_bits_pixel() + 7) >> 3; }

///

static 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);

}

//static int (get_permissions_first_mbyte)(void) {

//    return get_permission(MBYTE_BASE, MBYTE_SIZE);

//}

/// MEMORY

static uint8_t *video_mem = NULL; /** @brief Frame-buffer VM address. */

static uint8_t *video_buf = NULL; /** @brief Primary buffer for drawing before copying to video_mem. */

static mmap_t mem_map;

static int (graph_free_memory)(void) {

    int r = SUCCESS;

    free(video_buf); video_buf = NULL;

    r = !lm_free(&mem_map);

    return r;

}

static int (graph_map_vram)(void) {

    int r;

    const unsigned vram_base = graph_get_phys_addr();

    const unsigned vram_size = graph_get_vram_size();

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

        if (graph_free_memory()) {

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

        }

        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) {

        if (graph_free_memory()) {

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

        }

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

    }

    video_buf = malloc(vram_size);

    return SUCCESS;

}

/// INFO GET

static 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) || reg_86.ah != AH_SUCCESS) {

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

        if (graph_free_memory()) {

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

        }

        return BIOS_CALL_ERROR;

    }

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

    return SUCCESS;

}

/*

static int (vbe_get_controller_information)(vg_vbe_contr_info_t *info_p) {

    memset(info_p, 0, sizeof(vg_vbe_contr_info_t)); // reset values

    mmap_t controller_map;

    struct reg86 reg_86;

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

    VbeInfoBlock *virtual_addr = lm_alloc(sizeof(VbeInfoBlock), &controller_map);

    uint32_t virtual_base = (uint32_t)(virtual_addr) - controller_map.phys;

    virtual_addr->VbeSignature[0] = 'V';

    virtual_addr->VbeSignature[1] = 'B';

    virtual_addr->VbeSignature[2] = 'E';

    virtual_addr->VbeSignature[3] = '2';

    reg_86.intno = VC_BIOS_SERV;

    reg_86.ah = VBE_CALL;

    reg_86.al = VBE_CTRL_INFO;

    reg_86.es = PB2BASE(controller_map.phys);

    reg_86.di = PB2OFF(controller_map.phys);

    // BIOS CALL

    if (sys_int86(&reg_86) || reg_86.ah != AH_SUCCESS) {

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

        if (!lm_free(&controller_map)) {

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

        }

        return BIOS_CALL_ERROR;

    }

    info_p->VBESignature[0] = virtual_addr->VbeSignature[0];

    info_p->VBESignature[1] = virtual_addr->VbeSignature[1];

    info_p->VBESignature[2] = virtual_addr->VbeSignature[2];

    info_p->VBESignature[3] = virtual_addr->VbeSignature[3];

    uint8_t lsb, msb;

    util_get_LSB(virtual_addr->VbeVersion, &lsb);

    util_get_MSB(virtual_addr->VbeVersion, &msb);

    info_p->VBEVersion[0] = lsb;

    info_p->VBEVersion[1] = msb;

    info_p->TotalMemory = (virtual_addr->TotalMemory << 6);

    // Convert Far Far Pointer to Virtual Address

    uint32_t phys_ptr = FAR2PHYS(virtual_addr->OemStringPtr);

    uint32_t virtual_ptr = phys_ptr + virtual_base;

    info_p->OEMString = (char*)(virtual_ptr);

    phys_ptr = FAR2PHYS(virtual_addr->VideoModePtr);

    virtual_ptr = phys_ptr + virtual_base;

    info_p->VideoModeList = (uint16_t*)(virtual_ptr);

    phys_ptr = FAR2PHYS(virtual_addr->OemVendorNamePtr);

    virtual_ptr = phys_ptr + virtual_base;

    info_p->OEMVendorNamePtr = (char*)(virtual_ptr);

    phys_ptr = FAR2PHYS(virtual_addr->OemProductNamePtr);

    virtual_ptr = phys_ptr + virtual_base;

    info_p->OEMProductNamePtr = (char*)(virtual_ptr);

    phys_ptr = FAR2PHYS(virtual_addr->OemProductRevPtr);

    virtual_ptr = phys_ptr + virtual_base;

    info_p->OEMProductRevPtr = (char*)(virtual_ptr);

    if (!lm_free(&controller_map)) {

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

        return LCF_ERROR;

    }

    return SUCCESS;

}

*/

/// INIT

static int (graph_set_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) || reg_86.ah != AH_SUCCESS) {

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

        return BIOS_CALL_ERROR;

    }

    return SUCCESS;

}

int (graph_init)(uint16_t mode){

    if (vbe_get_mode_information(mode)) {

        printf("%s: failed to get information for mode %x.\n", __func__, mode);

        return 1;

    }

    graph_map_vram(); // if function fails it aborts program

    if (graph_set_mode(mode)) {

        printf("%s: failed to set graphic mode %x.\n", __func__, mode);

        return 1;

    };

    return SUCCESS;

}

/// CLEANUP

int (graph_cleanup)(void){

    int r = SUCCESS;

    if ((r = vg_exit()))

        printf("%s: vg_exit failed to exit to text mode.\n", __func__);

    if ((r = graph_free_memory()))

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

    return r;

}

/// PIXEL DRAWING

void (graph_set_pixel)(uint16_t x, uint16_t y, uint32_t color) {

    memcpy(video_buf + (x+y*graph_get_XRes())*graph_get_bytes_pixel(), &color, graph_get_bytes_pixel());

}

void (graph_set_pixel_pos)(unsigned pos, uint32_t color){

    memcpy(video_buf + pos, &color, graph_get_bytes_pixel());

}

int (graph_clear_screen)(void){ memset(video_buf, 0, graph_get_vram_size()); return SUCCESS; }

int (graph_draw)(void){ memcpy(video_mem, video_buf, graph_get_vram_size()); return SUCCESS; }

///SPRITE

#include "sprite.h"

#include "utils.h"

#include "fast_math.h"

#include <math.h>

struct basic_sprite{

    uint8_t *map;

    uint16_t w, h;

    int16_t u0, v0;

};

basic_sprite_t* (basic_sprite_ctor)(const char *const *xpm, int16_t u0, int16_t v0){

    basic_sprite_t *ret = malloc(sizeof(basic_sprite_t));

    if(ret == NULL) return NULL;

    enum xpm_image_type type = XPM_8_8_8_8;

    xpm_image_t img;

    ret->map = xpm_load((xpm_map_t)xpm, type, &img);

    if(ret->map == NULL){

        basic_sprite_dtor(ret);

        return NULL;

    }

    ret->w = img.width;

    ret->h = img.height;

    ret->u0 = u0;

    ret->v0 = v0;

    return ret;

}

void (basic_sprite_dtor)(basic_sprite_t *p){

    if(p == NULL) return;

    free(p->map);

    free(p);

}

const uint8_t* (basic_sprite_get_map)(const basic_sprite_t *p){ return p->map; }

uint16_t       (basic_sprite_get_w)  (const basic_sprite_t *p){ return p->w  ; }

uint16_t       (basic_sprite_get_h)  (const basic_sprite_t *p){ return p->h  ; }

int16_t        (basic_sprite_get_u0) (const basic_sprite_t *p){ return p->u0 ; }

int16_t        (basic_sprite_get_v0) (const basic_sprite_t *p){ return p->v0 ; }

struct sprite{

    const basic_sprite_t *bsp;

    int16_t x, y; //position in screen

    int16_t su0, sv0;

    double theta, s, c;

    double scale;

    uint8_t *sbuf;

};

sprite_t* (sprite_ctor)(const basic_sprite_t *bsp){

    sprite_t *ret = malloc(sizeof(sprite_t));

    if(ret == NULL) return NULL;

    ret->bsp = bsp;

    ret->sbuf = NULL;

    ret->x = 0;

    ret->y = 0;

    sprite_set_angle(ret, 0.0);

    sprite_set_scale(ret, 1.0);

    return ret;

}

void (sprite_dtor)(sprite_t *p){

    if(p == NULL) return;

    free(p->sbuf);

    free(p);

}

void (sprite_set_pos)   (sprite_t *p, int16_t x , int16_t y ){ p->x = x; p->y = y; }

void (sprite_set_angle) (sprite_t *p, double angle          ){ p->theta = angle; p->c = fm_cos(p->theta); p->s = fm_sin(p->theta); }

void (sprite_set_scale) (sprite_t *p, double scale          ){

    if(eq_d(p->scale, scale)) return;

    p->scale = scale;

    p->su0 = (int16_t)(p->bsp->u0*p->scale);

    p->sv0 = (int16_t)(p->bsp->u0*p->scale);

    const uint16_t W = basic_sprite_get_w(p->bsp),

                   H = basic_sprite_get_h(p->bsp);

    uint16_t sW = (uint16_t)(W*scale), sH = (uint16_t)(H*scale);

    p->sbuf = realloc(p->sbuf, sW*sH*4);

    const uint8_t *map = basic_sprite_get_map(p->bsp);

    for(uint16_t sx = 0; sx < sW; ++sx){

        for(uint16_t sy = 0; sy < sH; ++sy){

            uint16_t x = (uint16_t)(sx/scale), y = (uint16_t)(sy/scale);

            if(x > W || y > H) continue;

            memcpy(p->sbuf+4*(sx+sy*sW), map+4*(x+y*W), 4);

        }

    }

}

double   (sprite_get_angle)(const sprite_t *p){ return p->theta; }

uint16_t (sprite_get_w)(const sprite_t *p){ return basic_sprite_get_w(p->bsp); }

uint16_t (sprite_get_h)(const sprite_t *p){ return basic_sprite_get_h(p->bsp); }

static void (sprite_src2sbuf)(const sprite_t *p, int16_t x, int16_t y, int16_t *u, int16_t *v){

    if(p->theta == 0.0){

        *u = x - p->x + p->su0;

        *v = y - p->y + p->sv0;

    }else{

        double dx = x - p->x;

        double dy = y - p->y;

        int16_t du = (int16_t)(dx*p->c - dy*p->s - 0.5f);

        int16_t dv = (int16_t)(dx*p->s + dy*p->c - 0.5f);

        *u = du + p->su0;

        *v = dv + p->sv0;

    }

}

static void (sprite_sbuf2src)(const sprite_t *p, int16_t u, int16_t v, int16_t *x, int16_t *y){

    int16_t du = u - p->su0;

    int16_t dv = v - p->sv0;

    double dx =  du*p->c + dv*p->s;

    double dy = -du*p->s + dv*p->c;

    *x = (int16_t)(dx + 0.5 + p->x);

    *y = (int16_t)(dy + 0.5 + p->y);

}

void (sprite_draw)(const sprite_t *p){

    const uint16_t sw = (uint16_t)(p->scale*basic_sprite_get_w(p->bsp));

    const uint16_t sh = (uint16_t)(p->scale*basic_sprite_get_h(p->bsp));

    int16_t xmin, xmax, ymin, ymax; {

        int16_t x, y;

        sprite_sbuf2src(p, 0          , 0          , &x, &y);

        xmin = x; xmax = x; ymin = y; ymax = y;

        sprite_sbuf2src(p, (int16_t)sw, 0          , &x, &y);

        xmin = min_16(x, xmin); xmax = max_16(x, xmax); ymin = min_16(y, ymin); ymax = max_16(y, ymax);

        sprite_sbuf2src(p, 0          , (int16_t)sh, &x, &y);

        xmin = min_16(x, xmin); xmax = max_16(x, xmax); ymin = min_16(y, ymin); ymax = max_16(y, ymax);

        sprite_sbuf2src(p, (int16_t)sw, (int16_t)sh, &x, &y);

        xmin = min_16(x, xmin); xmax = max_16(x, xmax); ymin = min_16(y, ymin); ymax = max_16(y, ymax);

        xmin = max_16(xmin-2, 0); xmax = min_16(xmax+2, (int16_t)graph_get_XRes());

        ymin = max_16(ymin-2, 0); ymax = min_16(ymax+2, (int16_t)graph_get_YRes());

    }

    const uint16_t bytes_pixel = 3/*graph_get_bytes_pixel()*/;

    for(int16_t u, v, y = ymin; y < ymax; ++y){

        uint8_t *place = video_buf + (xmin + y*graph_get_XRes())*bytes_pixel;

        for(int16_t x = xmin; x < xmax; ++x, place += bytes_pixel){

            sprite_src2sbuf(p, x, y, &u, &v);

            //u = x; v = y;

            if(0 <= u && u < sw && 0 <= v && v < sh){

                const uint8_t *c_p = p->sbuf+(v*sw+u)*4;

                if(*(c_p+3) < ALPHA_THRESHOLD){ //alpha

                    memcpy(place, c_p, bytes_pixel);

                }

            }

        }

    }

}