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#include "zgl.h"
int glRenderMode(int mode)
{
GLContext *c=gl_get_context();
int result=0;
switch(c->render_mode) {
case GL_RENDER:
break;
case GL_SELECT:
if (c->select_overflow) {
result=-c->select_hits;
} else {
result=c->select_hits;
}
c->select_overflow=0;
c->select_ptr=c->select_buffer;
c->name_stack_size=0;
break;
default:
gl_assert(0);
}
switch(mode) {
case GL_RENDER:
c->render_mode=GL_RENDER;
break;
case GL_SELECT:
c->render_mode=GL_SELECT;
gl_assert( c->select_buffer != NULL);
c->select_ptr=c->select_buffer;
c->select_hits=0;
c->select_overflow=0;
c->select_hit=NULL;
break;
default:
gl_assert(0);
}
return result;
}
void glSelectBuffer(int size,unsigned int *buf)
{
GLContext *c=gl_get_context();
gl_assert(c->render_mode != GL_SELECT);
c->select_buffer=buf;
c->select_size=size;
}
void glopInitNames(GLContext *c,GLParam *p)
{
(void)p;
if (c->render_mode == GL_SELECT) {
c->name_stack_size=0;
c->select_hit=NULL;
}
}
void glopPushName(GLContext *c,GLParam *p)
{
if (c->render_mode == GL_SELECT) {
gl_assert(c->name_stack_size<MAX_NAME_STACK_DEPTH);
c->name_stack[c->name_stack_size++]=p[1].i;
c->select_hit=NULL;
}
}
void glopPopName(GLContext *c,GLParam *p)
{
(void)p;
if (c->render_mode == GL_SELECT) {
gl_assert(c->name_stack_size>0);
c->name_stack_size--;
c->select_hit=NULL;
}
}
void glopLoadName(GLContext *c,GLParam *p)
{
if (c->render_mode == GL_SELECT) {
gl_assert(c->name_stack_size>0);
c->name_stack[c->name_stack_size-1]=p[1].i;
c->select_hit=NULL;
}
}
void gl_add_select(GLContext *c,unsigned int zmin,unsigned int zmax)
{
unsigned int *ptr;
int n,i;
if (!c->select_overflow) {
if (c->select_hit==NULL) {
n=c->name_stack_size;
if ((c->select_ptr-c->select_buffer+3+n) >
c->select_size) {
c->select_overflow=1;
} else {
ptr=c->select_ptr;
c->select_hit=ptr;
*ptr++=c->name_stack_size;
*ptr++=zmin;
*ptr++=zmax;
for(i=0;i<n;i++) *ptr++=c->name_stack[i];
c->select_ptr=ptr;
c->select_hits++;
}
} else {
if (zmin<c->select_hit[1]) c->select_hit[1]=zmin;
if (zmax>c->select_hit[2]) c->select_hit[2]=zmax;
}
}
}
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