1 files changed, 116 insertions, 0 deletions
diff --git a/3rdparty/tinygl-0.4-ugfx/src/select.c b/3rdparty/tinygl-0.4-ugfx/src/select.c
new file mode 100644
index 00000000..46134dbc
--- /dev/null
+++ b/3rdparty/tinygl-0.4-ugfx/src/select.c
@@ -0,0 +1,116 @@
+#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;
+    }
+  }
+}