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// Z buffer: 16,32 bits Z / 16 bits color
#include "common/scummsys.h"
#include "common/endian.h"
#include "graphics/tinygl/zbuffer.h"
#include "graphics/tinygl/zgl.h"
namespace TinyGL {
uint8 PSZB;
ZBuffer *ZB_open(int xsize, int ysize, const Graphics::PixelBuffer &frame_buffer) {
ZBuffer *zb;
int size;
zb = (ZBuffer *)gl_malloc(sizeof(ZBuffer));
if (!zb)
return NULL;
zb->xsize = xsize;
zb->ysize = ysize;
zb->cmode = frame_buffer.getFormat();
PSZB = zb->pixelbytes = zb->cmode.bytesPerPixel;
zb->pixelbits = zb->cmode.bytesPerPixel * 8;
zb->linesize = (xsize * zb->pixelbytes + 3) & ~3;
size = zb->xsize * zb->ysize * sizeof(unsigned int);
zb->zbuf = (unsigned int *)gl_malloc(size);
if (!zb->zbuf)
goto error;
if (!frame_buffer) {
byte *pbuf = (byte *)gl_malloc(zb->ysize * zb->linesize);
if (!pbuf) {
gl_free(zb->zbuf);
goto error;
}
zb->pbuf.set(zb->cmode, pbuf);
zb->frame_buffer_allocated = 1;
} else {
zb->frame_buffer_allocated = 0;
zb->pbuf = frame_buffer;
}
zb->current_texture = NULL;
zb->shadow_mask_buf = NULL;
zb->buffer.pbuf = zb->pbuf.getRawBuffer();
zb->buffer.zbuf = zb->zbuf;
return zb;
error:
gl_free(zb);
return NULL;
}
void ZB_close(ZBuffer *zb) {
if (zb->frame_buffer_allocated)
zb->pbuf.free();
gl_free(zb->zbuf);
gl_free(zb);
}
void ZB_resize(ZBuffer *zb, void *frame_buffer, int xsize, int ysize) {
int size;
// xsize must be a multiple of 4
xsize = xsize & ~3;
zb->xsize = xsize;
zb->ysize = ysize;
zb->linesize = (xsize * zb->pixelbytes + 3) & ~3;
size = zb->xsize * zb->ysize * sizeof(unsigned int);
gl_free(zb->zbuf);
zb->zbuf = (unsigned int *)gl_malloc(size);
if (zb->frame_buffer_allocated)
zb->pbuf.free();
if (!frame_buffer) {
byte *pbuf = (byte *)gl_malloc(zb->ysize * zb->linesize);
zb->pbuf.set(zb->cmode, pbuf);
zb->frame_buffer_allocated = 1;
} else {
zb->pbuf = (byte *)frame_buffer;
zb->frame_buffer_allocated = 0;
}
}
static void ZB_copyBuffer(ZBuffer *zb, void *buf, int linesize) {
unsigned char *p1;
byte *q;
int y, n;
q = zb->pbuf.getRawBuffer();
p1 = (unsigned char *)buf;
n = zb->xsize * zb->pixelbytes;
for (y = 0; y < zb->ysize; y++) {
memcpy(p1, q, n);
p1 += linesize;
q = q + zb->linesize;
}
}
void ZB_copyFrameBuffer(ZBuffer *zb, void *buf, int linesize) {
ZB_copyBuffer(zb, buf, linesize);
}
// adr must be aligned on an 'int'
void memset_s(void *adr, int val, int count) {
int i, n, v;
unsigned int *p;
unsigned short *q;
p = (unsigned int *)adr;
v = val | (val << 16);
n = count >> 3;
for (i = 0; i < n; i++) {
p[0] = v;
p[1] = v;
p[2] = v;
p[3] = v;
p += 4;
}
q = (unsigned short *) p;
n = count & 7;
for (i = 0; i < n; i++)
*q++ = val;
}
void memset_l(void *adr, int val, int count) {
int i, n, v;
unsigned int *p;
p = (unsigned int *)adr;
v = val;
n = count >> 2;
for (i = 0; i < n; i++) {
p[0] = v;
p[1] = v;
p[2] = v;
p[3] = v;
p += 4;
}
n = count & 3;
for (i = 0; i < n; i++)
*p++ = val;
}
void ZB_clear(ZBuffer *zb, int clear_z, int z, int clear_color, int r, int g, int b) {
uint32 color;
int y;
byte *pp;
if (clear_z) {
memset_l(zb->zbuf, z, zb->xsize * zb->ysize);
}
if (clear_color) {
pp = zb->pbuf.getRawBuffer();
for (y = 0; y < zb->ysize; y++) {
color = zb->cmode.RGBToColor(r, g, b);
memset_s(pp, color, zb->xsize);
pp = pp + zb->linesize;
}
}
}
Buffer *ZB_genOffscreenBuffer(ZBuffer *zb) {
Buffer *buf = (Buffer *)gl_malloc(sizeof(Buffer));
buf->pbuf = (byte *)gl_malloc(zb->ysize * zb->linesize);
int size = zb->xsize * zb->ysize * sizeof(unsigned int);
buf->zbuf = (unsigned int *)gl_malloc(size);
return buf;
}
void ZB_delOffscreenBuffer(ZBuffer *zb, Buffer *buf) {
gl_free(buf->pbuf);
gl_free(buf->zbuf);
gl_free(buf);
}
void ZB_blitOffscreenBuffer(ZBuffer *zb, Buffer *buf) {
// TODO: could be faster, probably.
if (buf->used) {
for (int i = 0; i < zb->xsize * zb->ysize; ++i) {
unsigned int d1 = buf->zbuf[i];
unsigned int d2 = zb->zbuf[i];
if (d1 > d2) {
const int offset = i * PSZB;
memcpy(zb->pbuf.getRawBuffer() + offset, buf->pbuf + offset, PSZB);
memcpy(zb->zbuf + i, buf->zbuf + i, sizeof(int));
}
}
}
}
void ZB_selectOffscreenBuffer(ZBuffer *zb, Buffer *buf) {
if (buf) {
zb->pbuf = buf->pbuf;
zb->zbuf = buf->zbuf;
buf->used = true;
} else {
zb->pbuf = zb->buffer.pbuf;
zb->zbuf = zb->buffer.zbuf;
}
}
void ZB_clearOffscreenBuffer(ZBuffer *zb, Buffer *buf) {
memset(buf->pbuf, 0, zb->ysize * zb->linesize);
memset(buf->zbuf, 0, zb->ysize * zb->xsize * sizeof(unsigned int));
buf->used = false;
}
} // end of namespace TinyGL
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