ref: 12e7574c2cfaaa85ba947512670fc64cba6a51c3
dir: /src/zbuffer.c/
/*
* Z buffer: 16 bits Z / 16 bits color
*
*/
#include <assert.h>
//#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include "../include/GL/gl.h"
#include "../include/zbuffer.h"
ZBuffer* ZB_open(GLint xsize, GLint ysize, GLint mode, GLint nb_colors, GLubyte* color_indexes, GLint* color_table, void* frame_buffer) {
ZBuffer* zb;
GLint size;
zb = gl_malloc(sizeof(ZBuffer));
if (zb == NULL)
return NULL;
zb->xsize = xsize;
zb->ysize = ysize;
zb->mode = mode;
zb->linesize = (xsize * PSZB + 3) & ~3;
switch (mode) {
#ifdef TGL_FEATURE_8_BITS
case ZB_MODE_INDEX:
ZB_initDither(zb, nb_colors, color_indexes, color_table);
break;
#endif
#ifdef TGL_FEATURE_32_BITS
case ZB_MODE_RGBA:
#endif
#ifdef TGL_FEATURE_24_BITS
case ZB_MODE_RGB24:
#endif
case ZB_MODE_5R6G5B:
zb->nb_colors = 0;
break;
default:
goto error;
}
size = zb->xsize * zb->ysize * sizeof(GLushort);
zb->zbuf = gl_malloc(size);
if (zb->zbuf == NULL)
goto error;
if (frame_buffer == NULL) {
zb->pbuf = gl_malloc(zb->ysize * zb->linesize);
if (zb->pbuf == NULL) {
gl_free(zb->zbuf);
goto error;
}
zb->frame_buffer_allocated = 1;
} else {
zb->frame_buffer_allocated = 0;
zb->pbuf = frame_buffer;
}
zb->current_texture = NULL;
return zb;
error:
gl_free(zb);
return NULL;
}
void ZB_close(ZBuffer* zb) {
#ifdef TGL_FEATURE_8_BITS
if (zb->mode == ZB_MODE_INDEX)
ZB_closeDither(zb);
#endif
if (zb->frame_buffer_allocated)
gl_free(zb->pbuf);
gl_free(zb->zbuf);
gl_free(zb);
}
void ZB_resize(ZBuffer* zb, void* frame_buffer, GLint xsize, GLint ysize) {
GLint size;
/* xsize must be a multiple of 4 */
xsize = xsize & ~3;
zb->xsize = xsize;
zb->ysize = ysize;
zb->linesize = (xsize * PSZB + 3) & ~3;
size = zb->xsize * zb->ysize * sizeof(GLushort);
gl_free(zb->zbuf);
zb->zbuf = gl_malloc(size);
if (zb->frame_buffer_allocated)
gl_free(zb->pbuf);
if (frame_buffer == NULL) {
zb->pbuf = gl_malloc(zb->ysize * zb->linesize);
zb->frame_buffer_allocated = 1;
} else {
zb->pbuf = frame_buffer;
zb->frame_buffer_allocated = 0;
}
}
#if TGL_FEATURE_32_BITS == 1
inline PIXEL pxReverse32(PIXEL x) {
return
// Source is in format: 0xAARRGGBB
((x & 0xFF000000) >> 24) | //______AA
((x & 0x00FF0000) >> 8) | //____RR__
((x & 0x0000FF00) << 8) | //__GG____
((x & 0x000000FF) << 24); // BB______
// Return value is in format: 0xBBGGRRAA
}
#endif
static void ZB_copyBuffer(ZBuffer* zb, void* buf, GLint linesize) {
GLubyte* p1;
PIXEL* q;
GLint y;
q = zb->pbuf;
p1 = buf;
for (y = 0; y < zb->ysize; y++) {
#if TGL_FEATURE_NO_COPY_COLOR == 1
for (GLint i = 0; i < zb->xsize; i++) {
if ((*(q + i) & TGL_COLOR_MASK) != TGL_NO_COPY_COLOR)
*(((PIXEL*)p1) + i) = *(q + i);
}
#else
memcpy(p1, q, linesize);
#endif
p1 += linesize;
q = (PIXEL*)((GLbyte*)q + zb->linesize);
}
}
#if TGL_FEATURE_RENDER_BITS == 16
/* 32 bpp copy */
/*
#ifdef TGL_FEATURE_32_BITS
#define RGB16_TO_RGB32(p0,p1,v)\
{\
GLuint g,b,gb;\
g = (v & 0x07E007E0) << 5;\
b = (v & 0x001F001F) << 3;\
gb = g | b;\
p0 = (gb & 0x0000FFFF) | ((v & 0x0000F800) << 8);\
p1 = (gb >> 16) | ((v & 0xF8000000) >> 8);\
}
//This function is never called.
static void ZB_copyFrameBufferRGB32(ZBuffer * zb,
void *buf,
GLint linesize)
{
GLushort *q;
GLuint *p, *p1, v, w0, w1;
GLint y, n;
q = zb->pbuf;
p1 = (GLuint *) buf;
//puts("\nBEING CALLED\n");
for (y = 0; y < zb->ysize; y++) {
p = p1;
n = zb->xsize >> 2;
do {
v = *(GLuint *) q;
RGB16_TO_RGB32(w1, w0, v);
p[0] = w0;
p[1] = w1;
v = *(GLuint *) (q + 2);
RGB16_TO_RGB32(w1, w0, v);
p[2] = w0;
p[3] = 0;
q += 4;
p += 4;
} while (--n > 0);
p1 += linesize;
}
}
*/
#endif
/* 24 bit packed pixel handling */
#ifdef TGL_FEATURE_24_BITS
/* order: RGBR GBRG BRGB */
/* XXX: packed pixel 24 bit support not tested */
/* XXX: big endian case not optimised */
/*
#if BYTE_ORDER == BIG_ENDIAN
#define RGB16_TO_RGB24(p0,p1,p2,v1,v2)\
{\
GLuint r1,g1,b1,gb1,g2,b2,gb2;\
v1 = (v1 << 16) | (v1 >> 16);\
v2 = (v2 << 16) | (v2 >> 16);\
r1 = (v1 & 0xF800F800);\
g1 = (v1 & 0x07E007E0) << 5;\
b1 = (v1 & 0x001F001F) << 3;\
gb1 = g1 | b1;\
p0 = ((gb1 & 0x0000FFFF) << 8) | (r1 << 16) | (r1 >> 24);\
g2 = (v2 & 0x07E007E0) << 5;\
b2 = (v2 & 0x001F001F) << 3;\
gb2 = g2 | b2;\
p1 = (gb1 & 0xFFFF0000) | (v2 & 0xF800) | ((gb2 >> 8) & 0xff);\
p2 = (gb2 << 24) | ((v2 & 0xF8000000) >> 8) | (gb2 >> 16);\
}
#else
#define RGB16_TO_RGB24(p0,p1,p2,v1,v2)\
{\
GLuint r1,g1,b1,gb1,g2,b2,gb2;\
r1 = (v1 & 0xF800F800);\
g1 = (v1 & 0x07E007E0) << 5;\
b1 = (v1 & 0x001F001F) << 3;\
gb1 = g1 | b1;\
p0 = ((gb1 & 0x0000FFFF) << 8) | (r1 << 16) | (r1 >> 24);\
g2 = (v2 & 0x07E007E0) << 5;\
b2 = (v2 & 0x001F001F) << 3;\
gb2 = g2 | b2;\
p1 = (gb1 & 0xFFFF0000) | (v2 & 0xF800) | ((gb2 >> 8) & 0xff);\
p2 = (gb2 << 24) | ((v2 & 0xF8000000) >> 8) | (gb2 >> 16);\
}
#endif
*/
/*
static void ZB_copyFrameBufferRGB24(ZBuffer * zb,
void *buf,
GLint linesize)
{
GLushort *q;
GLuint *p, *p1, w0, w1, w2, v0, v1;
GLint y, n;
q = zb->pbuf;
p1 = (GLuint *) buf;
linesize = linesize * 3;
for (y = 0; y < zb->ysize; y++) {
p = p1;
n = zb->xsize >> 2;
do {
v0 = *(GLuint *) q;
v1 = *(GLuint *) (q + 2);
RGB16_TO_RGB24(w0, w1, w2, v0, v1);
p[0] = w0;
p[1] = w1;
p[2] = w2;
q += 4;
p += 3;
} while (--n > 0);
*((GLbyte *) p1) += linesize;
}
}
*/
#endif
#if TGL_FEATURE_RENDER_BITS == 16
void ZB_copyFrameBuffer(ZBuffer* zb, void* buf, GLint linesize) {
ZB_copyBuffer(zb, buf, linesize);
// switch (zb->mode) {
/*
#ifdef TGL_FEATURE_8_BITS
case ZB_MODE_INDEX:
ZB_ditherFrameBuffer(zb, buf, linesize >> 1);
break;
#endif
*/
/*#ifdef TGL_FEATURE_16_BITS
case ZB_MODE_5R6G5B:
ZB_copyBuffer(zb, buf, linesize);
break;
#endif*/
/*#ifdef TGL_FEATURE_32_BITS
case ZB_MODE_RGBA:
ZB_copyFrameBufferRGB32(zb, buf, linesize >> 1);
break;
#endif
*/
// default:
// assert(0);
// }
}
#endif /* TGL_FEATURE_RENDER_BITS == 16 */
/*
#if TGL_FEATURE_RENDER_BITS == 24
#define RGB24_TO_RGB16(r, g, b) \
((((r) >> 3) << 11) | (((g) >> 2) << 5) | ((b) >> 3))
// XXX: not optimized
static void ZB_copyFrameBuffer5R6G5B(ZBuffer * zb,
void *buf, GLint linesize)
{
PIXEL *q;
GLushort *p, *p1;
GLint y, n;
q = zb->pbuf;
p1 = (GLushort *) buf;
for (y = 0; y < zb->ysize; y++) {
p = p1;
n = zb->xsize >> 2;
do {
p[0] = RGB24_TO_RGB16(q[0], q[1], q[2]);
p[1] = RGB24_TO_RGB16(q[3], q[4], q[5]);
p[2] = RGB24_TO_RGB16(q[6], q[7], q[8]);
p[3] = RGB24_TO_RGB16(q[9], q[10], q[11]);
q = (PIXEL *)((GLbyte *)q + 4 * PSZB);
p += 4;
} while (--n > 0);
p1 = (GLushort *)((GLbyte *)p1 + linesize);
}
}
void ZB_copyFrameBuffer(ZBuffer * zb, void *buf,
GLint linesize)
{
switch (zb->mode) {
#ifdef TGL_FEATURE_16_BITS
case ZB_MODE_5R6G5B:
ZB_copyFrameBuffer5R6G5B(zb, buf, linesize);
break;
#endif
#ifdef TGL_FEATURE_24_BITS
case ZB_MODE_RGB24:
ZB_copyBuffer(zb, buf, linesize);
break;
#endif
default:
assert(0);
}
}
#endif
*/
/* TGL_FEATURE_RENDER_BITS == 24
*/
#if TGL_FEATURE_RENDER_BITS == 32
#define RGB32_TO_RGB16(v) (((v >> 8) & 0xf800) | (((v) >> 5) & 0x07e0) | (((v)&0xff) >> 3))
/* XXX: not optimized */
/*
static void ZB_copyFrameBuffer5R6G5B(ZBuffer * zb,
void *buf, GLint linesize)
{
PIXEL *q;
GLushort *p, *p1;
GLint y, n;
q = zb->pbuf;
p1 = (GLushort *) buf;
for (y = 0; y < zb->ysize; y++) {
p = p1;
n = zb->xsize >> 2;
do {
p[0] = RGB32_TO_RGB16(q[0]);
p[1] = RGB32_TO_RGB16(q[1]);
p[2] = RGB32_TO_RGB16(q[2]);
p[3] = RGB32_TO_RGB16(q[3]);
q += 4;
p += 4;
} while (--n > 0);
p1 = (GLushort *)((GLbyte *)p1 + linesize);
}
}
*/
void ZB_copyFrameBuffer(ZBuffer* zb, void* buf, GLint linesize) {
ZB_copyBuffer(zb, buf, linesize);
// switch (zb->mode) {
/*
#ifdef TGL_FEATURE_16_BITS
case ZB_MODE_5R6G5B:
ZB_copyFrameBuffer5R6G5B(zb, buf, linesize);
break;
#endif
*/
/*
#ifdef TGL_FEATURE_32_BITS
case ZB_MODE_RGBA:
ZB_copyBuffer(zb, buf, linesize);
break;
#endif
default:
assert(0);
}
*/
}
#endif /* TGL_FEATURE_RENDER_BITS == 32 */
/*
* adr must be aligned on an 'int'
*/
// Used in 16 bit mode
void memset_s(void* adr, GLint val, GLint count) {
GLint i, n, v;
GLuint* p;
GLushort* q;
p = 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 = (GLushort*)p;
n = count & 7;
for (i = 0; i < n; i++)
*q++ = val;
}
// Used in 32 bit mode
void memset_l(void* adr, GLint val, GLint count) {
GLint i, n, v;
GLuint* p;
p = 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;
}
/* count must be a multiple of 4 and >= 4 */
// Gek's note: Should never be used.
void memset_RGB24(void* adr, GLint r, GLint v, GLint b, long count) {
long i, n;
register long v1, v2, v3, *pt = (long*)(adr);
GLubyte *p, R = (GLubyte)r, V = (GLubyte)v, B = (GLubyte)b;
p = (GLubyte*)adr;
*p++ = R;
*p++ = V;
*p++ = B;
*p++ = R;
*p++ = V;
*p++ = B;
*p++ = R;
*p++ = V;
*p++ = B;
*p++ = R;
*p++ = V;
*p++ = B;
v1 = *pt++;
v2 = *pt++;
v3 = *pt++;
n = count >> 2;
for (i = 1; i < n; i++) {
*pt++ = v1;
*pt++ = v2;
*pt++ = v3;
}
}
void ZB_clear(ZBuffer* zb, GLint clear_z, GLint z, GLint clear_color, GLint r, GLint g, GLint b) {
//#if TGL_FEATURE_RENDER_BITS != 24
GLuint color;
//#endif
GLint y;
PIXEL* pp;
if (clear_z) {
memset_s(zb->zbuf, z, zb->xsize * zb->ysize);
}
if (clear_color) {
pp = zb->pbuf;
for (y = 0; y < zb->ysize; y++) {
#if TGL_FEATURE_RENDER_BITS == 15 || TGL_FEATURE_RENDER_BITS == 16
// color = RGB_TO_PIXEL(r, g, b);
#if TGL_FEATURE_FORCE_CLEAR_NO_COPY_COLOR
color = TGL_NO_COPY_COLOR;
#else
color = RGB_TO_PIXEL(r, g, b);
#endif
memset_s(pp, color, zb->xsize);
#elif TGL_FEATURE_RENDER_BITS == 32
#if TGL_FEATURE_FORCE_CLEAR_NO_COPY_COLOR
color = TGL_NO_COPY_COLOR;
#else
color = RGB_TO_PIXEL(r, g, b);
#endif
memset_l(pp, color, zb->xsize);
#else
#error BADJUJU
#endif
pp = (PIXEL*)((GLbyte*)pp + zb->linesize);
}
}
}