1v13d/src/FxEngine/zbuffer.c

#include "zbuffer.h"

#include <stdint.h>
#include <stdbool.h>
#include <gint/display.h>
#include <gint/std/stdio.h>
#include <gint/std/stdlib.h>
#include <gint/keyboard.h>
#include <gint/dma.h>
#include <gint/hardware.h>
/** size_uint32
 * taille du zbuffer exprimée en uint32_t
 * utile pour l'effacement du zbuffer sur sh3
**/
static const uint32_t size_uint32 = FE_ZB_SIZE_X*FE_ZB_SIZE_Y;

/** size_char
 * taille du zbuffer exprimée en octets
 * sera utile pour le DMA Controller
**/
static const uint32_t size_char = size_uint32*sizeof(int32_t);

/** address
 * addresse du zbuffer
**/
static int32_t* address=0;

const int32_t clearval=3000;

void FE_zbuffer_clear()
{
    if (address==0)
    {
        address = malloc(size_char);
        if (address==0) // cas de figure où il n'y a plus assez de RAM
        {
            dclear(C_WHITE);
            dtext(1, 1, "Not enough RAM...", C_BLACK, C_NONE);
            dupdate();
            while (1==1)
                getkey();
        }
    }
    // TODO déterminer le type d'effacement
    if (isSH3())
    { // effacement fait par le CPU
        uint32_t indice;
        for (indice = 0; indice < size_uint32; indice ++)
            address[indice] = clearval;
    }
    else
    { // effacement fait par le DMA
        dma_transfer(0, DMA_32B, size_uint32, &clearval, DMA_FIXED,
        address, DMA_INC);
    }
    

}

bool FE_zbuffer_set_dist(int32_t x, int32_t y, int32_t dist)
{
    x %= FE_ZB_SIZE_X;
    y %= FE_ZB_SIZE_Y;
    const uint32_t indice = x * 64 + y;
    if (address[indice]>dist && dist>0)
    {
        address[indice] = dist;
        return true;
    }
    else
        return false;
}