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