#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_int32 = FE_ZB_SIZE_X*FE_ZB_SIZE_Y;

/* size_char
   taille du zbuffer exprimée en octets
   utile pour malloc */
static const uint32_t size_char = size_int32*sizeof(int32_t);

/*  size_char
   taille du zbuffer exprimée en octets
   utile pour le DMA */
static const uint32_t size_blocks = size_char/32;

// buffer situe a la fin de la RAM
static const int32_t *address = (void *)0x88080000 - size_char;

#include <gint/defs/attributes.h>
GALIGNED(32) GSECTION(".rodata") static const int32_t clearval[8]={3000,3000,3000,3000,3000,3000,3000,3000};

void FE_zbuffer_clear()
{
    if (isSH3())
    { // effacement CPU
        uint_fast16_t indice;
        for (indice = 0; indice < size_int32; indice ++)
            address[indice] = clearval[0];
    }
    else
    { // effacement DMA
        dma_transfer(0, DMA_32B, size_blocks, &clearval, DMA_FIXED, address, DMA_INC);
    }
}

void FE_start_rendering()
{
    if (!isSH3())
        dma_transfer_wait(0);

}

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;
}