scummvm/graphics/tinygl/clear.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * This file is based on, or a modified version of code from TinyGL (C) 1997-2022 Fabrice Bellard,
 * which is licensed under the MIT license (see LICENSE).
 * It also has modifications by the ResidualVM-team, which are covered under the GPLv2 (or later).
 */

#include "graphics/tinygl/zgl.h"
#include "graphics/tinygl/zdirtyrect.h"

namespace TinyGL {

void GLContext::glopClearColor(GLParam *p) {
	clear_color = Vector4(p[1].f, p[2].f, p[3].f, p[4].f);
}

void GLContext::glopClearDepth(GLParam *p) {
	clear_depth = p[1].f;
}

void GLContext::glopClearStencil(GLParam *p) {
	clear_stencil = p[1].i & 0xFF;
}

void GLContext::glopClear(GLParam *p) {
	int mask = p[1].i;
	int z = (int)(clear_depth * ((1 << ZB_Z_BITS) - 1));
	int r = (int)(clear_color.X * 255);
	int g = (int)(clear_color.Y * 255);
	int b = (int)(clear_color.Z * 255);
	int s = (int)(clear_stencil);

	issueDrawCall(new ClearBufferDrawCall(mask & TGL_DEPTH_BUFFER_BIT, z,
	                                      mask & TGL_COLOR_BUFFER_BIT, r, g, b,
	                                      mask & TGL_STENCIL_BUFFER_BIT, s));
}

} // end of namespace TinyGL