139 lines
3.3 KiB
C++
139 lines
3.3 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/*
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* This file is based on, or a modified version of code from TinyGL (C) 1997-1998 Fabrice Bellard,
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* which is licensed under the zlib-license (see LICENSE).
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* It also has modifications by the ResidualVM-team, which are covered under the GPLv2 (or later).
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*/
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#include "graphics/tinygl/zgl.h"
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namespace TinyGL {
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int tglRenderMode(int mode) {
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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 TGL_RENDER:
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break;
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case TGL_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 TGL_RENDER:
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c->render_mode = TGL_RENDER;
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break;
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case TGL_SELECT:
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c->render_mode = TGL_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 tglSelectBuffer(int size, uint *buf) {
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GLContext *c = gl_get_context();
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assert(c->render_mode != TGL_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 GLContext::glopInitNames(GLParam *) {
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if (render_mode == TGL_SELECT) {
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name_stack_size = 0;
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select_hit = NULL;
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}
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}
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void GLContext::glopPushName(GLParam *p) {
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if (render_mode == TGL_SELECT) {
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assert(name_stack_size < MAX_NAME_STACK_DEPTH);
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name_stack[name_stack_size++] = p[1].i;
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select_hit = NULL;
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}
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}
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void GLContext::glopPopName(GLParam *) {
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if (render_mode == TGL_SELECT) {
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assert(name_stack_size > 0);
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name_stack_size--;
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select_hit = NULL;
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}
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}
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void GLContext::glopLoadName(GLParam *p) {
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if (render_mode == TGL_SELECT) {
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assert(name_stack_size > 0);
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name_stack[name_stack_size - 1] = p[1].i;
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select_hit = NULL;
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}
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}
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void GLContext::gl_add_select(uint zmin, uint zmax) {
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uint *ptr;
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int n;
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if (!select_overflow) {
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if (!select_hit) {
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n = name_stack_size;
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if ((select_ptr - select_buffer + 3 + n) > select_size) {
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select_overflow = 1;
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} else {
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ptr = select_ptr;
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select_hit = ptr;
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*ptr++ = name_stack_size;
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*ptr++ = zmin;
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*ptr++ = zmax;
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for (int i = 0; i < n; i++)
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*ptr++ = name_stack[i];
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select_ptr = ptr;
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select_hits++;
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}
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} else {
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if (zmin < select_hit[1])
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select_hit[1] = zmin;
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if (zmax > select_hit[2])
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select_hit[2] = zmax;
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}
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}
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}
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} // end of namespace TinyGL
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