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#include "cube.h"
extern int glversion;
extern int intel_mapbufferrange_bug;
namespace gle
{
struct attribinfo
{
int type, size, formatsize, offset;
GLenum format;
attribinfo() : type(0), size(0), formatsize(0), offset(0), format(GL_FALSE) {}
bool operator==(const attribinfo &a) const
{
return type == a.type && size == a.size && format == a.format && offset == a.offset;
}
bool operator!=(const attribinfo &a) const
{
return type != a.type || size != a.size || format != a.format || offset != a.offset;
}
};
extern const char * const attribnames[MAXATTRIBS] = { "vvertex", "vcolor", "vtexcoord0", "vtexcoord1", "vnormal", "vtangent", "vboneweight", "vboneindex" };
ucharbuf attribbuf;
static uchar *attribdata;
static attribinfo attribdefs[MAXATTRIBS], lastattribs[MAXATTRIBS];
int enabled = 0;
static int numattribs = 0, attribmask = 0, numlastattribs = 0, lastattribmask = 0, vertexsize = 0, lastvertexsize = 0;
static GLenum primtype = GL_TRIANGLES;
static uchar *lastbuf = NULL;
static bool changedattribs = false;
static vector<GLint> multidrawstart;
static vector<GLsizei> multidrawcount;
#define MAXQUADS (0x10000/4)
static GLuint quadindexes = 0;
static bool quadsenabled = false;
#define MAXVBOSIZE (4*1024*1024)
static GLuint vbo = 0;
static int vbooffset = MAXVBOSIZE;
static GLuint defaultvao = 0;
void enablequads()
{
quadsenabled = true;
if(glversion < 300) return;
if(quadindexes)
{
glBindBuffer_(GL_ELEMENT_ARRAY_BUFFER, quadindexes);
return;
}
glGenBuffers_(1, &quadindexes);
ushort *data = new ushort[MAXQUADS*6], *dst = data;
for(int idx = 0; idx < MAXQUADS*4; idx += 4, dst += 6)
{
dst[0] = idx;
dst[1] = idx + 1;
dst[2] = idx + 2;
dst[3] = idx + 0;
dst[4] = idx + 2;
dst[5] = idx + 3;
}
glBindBuffer_(GL_ELEMENT_ARRAY_BUFFER, quadindexes);
glBufferData_(GL_ELEMENT_ARRAY_BUFFER, MAXQUADS*6*sizeof(ushort), data, GL_STATIC_DRAW);
delete[] data;
}
void disablequads()
{
quadsenabled = false;
if(glversion < 300) return;
glBindBuffer_(GL_ELEMENT_ARRAY_BUFFER, 0);
}
void drawquads(int offset, int count)
{
if(count <= 0) return;
if(glversion < 300)
{
glDrawArrays(GL_QUADS, offset*4, count*4);
return;
}
if(offset + count > MAXQUADS)
{
if(offset >= MAXQUADS) return;
count = MAXQUADS - offset;
}
glDrawRangeElements_(GL_TRIANGLES, offset*4, (offset + count)*4-1, count*6, GL_UNSIGNED_SHORT, (ushort *)0 + offset*6);
}
void defattrib(int type, int size, int format)
{
if(type == ATTRIB_VERTEX)
{
numattribs = attribmask = 0;
vertexsize = 0;
}
changedattribs = true;
attribmask |= 1<<type;
attribinfo &a = attribdefs[numattribs++];
a.type = type;
a.size = size;
a.format = format;
switch(format)
{
case 'B': case GL_UNSIGNED_BYTE: a.formatsize = 1; a.format = GL_UNSIGNED_BYTE; break;
case 'b': case GL_BYTE: a.formatsize = 1; a.format = GL_BYTE; break;
case 'S': case GL_UNSIGNED_SHORT: a.formatsize = 2; a.format = GL_UNSIGNED_SHORT; break;
case 's': case GL_SHORT: a.formatsize = 2; a.format = GL_SHORT; break;
case 'I': case GL_UNSIGNED_INT: a.formatsize = 4; a.format = GL_UNSIGNED_INT; break;
case 'i': case GL_INT: a.formatsize = 4; a.format = GL_INT; break;
case 'f': case GL_FLOAT: a.formatsize = 4; a.format = GL_FLOAT; break;
case 'd': case GL_DOUBLE: a.formatsize = 8; a.format = GL_DOUBLE; break;
default: a.formatsize = 0; a.format = GL_FALSE; break;
}
a.formatsize *= size;
a.offset = vertexsize;
vertexsize += a.formatsize;
}
void defattribs(const char *fmt)
{
for(;; fmt += 3)
{
GLenum format;
switch(fmt[0])
{
case 'v': format = ATTRIB_VERTEX; break;
case 'c': format = ATTRIB_COLOR; break;
case 't': format = ATTRIB_TEXCOORD0; break;
case 'T': format = ATTRIB_TEXCOORD1; break;
case 'n': format = ATTRIB_NORMAL; break;
case 'x': format = ATTRIB_TANGENT; break;
case 'w': format = ATTRIB_BONEWEIGHT; break;
case 'i': format = ATTRIB_BONEINDEX; break;
default: return;
}
defattrib(format, fmt[1]-'0', fmt[2]);
}
}
static inline void setattrib(const attribinfo &a, uchar *buf)
{
switch(a.type)
{
case ATTRIB_VERTEX:
case ATTRIB_TEXCOORD0:
case ATTRIB_TEXCOORD1:
case ATTRIB_BONEINDEX:
glVertexAttribPointer_(a.type, a.size, a.format, GL_FALSE, vertexsize, buf);
break;
case ATTRIB_COLOR:
case ATTRIB_NORMAL:
case ATTRIB_TANGENT:
case ATTRIB_BONEWEIGHT:
glVertexAttribPointer_(a.type, a.size, a.format, GL_TRUE, vertexsize, buf);
break;
}
if(!(enabled&(1<<a.type)))
{
glEnableVertexAttribArray_(a.type);
enabled |= 1<<a.type;
}
}
static inline void unsetattrib(const attribinfo &a)
{
glDisableVertexAttribArray_(a.type);
enabled &= ~(1<<a.type);
}
static inline void setattribs(uchar *buf)
{
bool forceattribs = numattribs != numlastattribs || vertexsize != lastvertexsize || buf != lastbuf;
if(forceattribs || changedattribs)
{
int diffmask = enabled & lastattribmask & ~attribmask;
if(diffmask) loopi(numlastattribs)
{
const attribinfo &a = lastattribs[i];
if(diffmask & (1<<a.type)) unsetattrib(a);
}
uchar *src = buf;
loopi(numattribs)
{
const attribinfo &a = attribdefs[i];
if(forceattribs || a != lastattribs[i])
{
setattrib(a, src);
lastattribs[i] = a;
}
src += a.formatsize;
}
lastbuf = buf;
numlastattribs = numattribs;
lastattribmask = attribmask;
lastvertexsize = vertexsize;
changedattribs = false;
}
}
void begin(GLenum mode)
{
primtype = mode;
}
void begin(GLenum mode, int numverts)
{
primtype = mode;
if(glversion >= 300 && !intel_mapbufferrange_bug)
{
int len = numverts * vertexsize;
if(vbooffset + len >= MAXVBOSIZE)
{
len = min(len, MAXVBOSIZE);
if(!vbo) glGenBuffers_(1, &vbo);
glBindBuffer_(GL_ARRAY_BUFFER, vbo);
glBufferData_(GL_ARRAY_BUFFER, MAXVBOSIZE, NULL, GL_STREAM_DRAW);
vbooffset = 0;
}
else if(!lastvertexsize) glBindBuffer_(GL_ARRAY_BUFFER, vbo);
void *buf = glMapBufferRange_(GL_ARRAY_BUFFER, vbooffset, len, GL_MAP_WRITE_BIT|GL_MAP_INVALIDATE_RANGE_BIT|GL_MAP_UNSYNCHRONIZED_BIT);
if(buf) attribbuf.reset((uchar *)buf, len);
}
}
void multidraw()
{
int start = multidrawstart.length() ? multidrawstart.last() + multidrawcount.last() : 0,
count = attribbuf.length()/vertexsize - start;
if(count > 0)
{
multidrawstart.add(start);
multidrawcount.add(count);
}
}
int end()
{
uchar *buf = attribbuf.getbuf();
if(attribbuf.empty())
{
if(buf != attribdata)
{
glUnmapBuffer_(GL_ARRAY_BUFFER);
attribbuf.reset(attribdata, MAXVBOSIZE);
}
return 0;
}
int start = 0;
if(glversion >= 300)
{
if(buf == attribdata)
{
if(vbooffset + attribbuf.length() >= MAXVBOSIZE)
{
if(!vbo) glGenBuffers_(1, &vbo);
glBindBuffer_(GL_ARRAY_BUFFER, vbo);
glBufferData_(GL_ARRAY_BUFFER, MAXVBOSIZE, NULL, GL_STREAM_DRAW);
vbooffset = 0;
}
else if(!lastvertexsize) glBindBuffer_(GL_ARRAY_BUFFER, vbo);
void *dst = intel_mapbufferrange_bug ? NULL :
glMapBufferRange_(GL_ARRAY_BUFFER, vbooffset, attribbuf.length(), GL_MAP_WRITE_BIT|GL_MAP_INVALIDATE_RANGE_BIT|GL_MAP_UNSYNCHRONIZED_BIT);
if(dst)
{
memcpy(dst, attribbuf.getbuf(), attribbuf.length());
glUnmapBuffer_(GL_ARRAY_BUFFER);
}
else glBufferSubData_(GL_ARRAY_BUFFER, vbooffset, attribbuf.length(), attribbuf.getbuf());
}
else glUnmapBuffer_(GL_ARRAY_BUFFER);
buf = (uchar *)0 + vbooffset;
if(vertexsize == lastvertexsize && buf >= lastbuf)
{
start = int(buf - lastbuf)/vertexsize;
if(primtype == GL_QUADS && (start%4 || start + attribbuf.length()/vertexsize >= 4*MAXQUADS))
start = 0;
else buf = lastbuf;
}
vbooffset += attribbuf.length();
}
setattribs(buf);
int numvertexes = attribbuf.length()/vertexsize;
if(primtype == GL_QUADS)
{
if(!quadsenabled) enablequads();
for(int quads = numvertexes/4;;)
{
int count = min(quads, MAXQUADS);
drawquads(start/4, count);
quads -= count;
if(quads <= 0) break;
setattribs(buf + 4*count*vertexsize);
start = 0;
}
}
else
{
if(multidrawstart.length())
{
multidraw();
if(start) loopv(multidrawstart) multidrawstart[i] += start;
glMultiDrawArrays_(primtype, multidrawstart.getbuf(), multidrawcount.getbuf(), multidrawstart.length());
multidrawstart.setsize(0);
multidrawcount.setsize(0);
}
else glDrawArrays(primtype, start, numvertexes);
}
attribbuf.reset(attribdata, MAXVBOSIZE);
return numvertexes;
}
void forcedisable()
{
for(int i = 0; enabled; i++) if(enabled&(1<<i)) { glDisableVertexAttribArray_(i); enabled &= ~(1<<i); }
numlastattribs = lastattribmask = lastvertexsize = 0;
lastbuf = NULL;
if(quadsenabled) disablequads();
if(glversion >= 300) glBindBuffer_(GL_ARRAY_BUFFER, 0);
}
void setup()
{
if(glversion >= 300)
{
if(!defaultvao) glGenVertexArrays_(1, &defaultvao);
glBindVertexArray_(defaultvao);
}
attribdata = new uchar[MAXVBOSIZE];
attribbuf.reset(attribdata, MAXVBOSIZE);
}
void cleanup()
{
disable();
if(quadindexes) { glDeleteBuffers_(1, &quadindexes); quadindexes = 0; }
if(vbo) { glDeleteBuffers_(1, &vbo); vbo = 0; }
vbooffset = MAXVBOSIZE;
if(defaultvao) { glDeleteVertexArrays_(1, &defaultvao); defaultvao = 0; }
}
}
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