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engines/tetraedge/te/te_light_tinygl.cpp

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+/* 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/>.
+ *
+ */
+
+#include "graphics/tinygl/tinygl.h"
+
+#include "tetraedge/te/te_light_tinygl.h"
+#include "tetraedge/tetraedge.h"
+#include "tetraedge/te/te_color.h"
+#include "tetraedge/te/te_quaternion.h"
+#include "tetraedge/te/te_vector3f32.h"
+
+namespace Tetraedge {
+
+static inline uint _toGlLight(uint lightno) {
+	return TGL_LIGHT0 + lightno;
+}
+
+TeLightTinyGL::TeLightTinyGL() {
+}
+
+void TeLightTinyGL::disable(uint lightno) {
+	tglDisable(_toGlLight(lightno));
+}
+
+void TeLightTinyGL::enable(uint lightno) {
+	if (_colDiffuse.r() == 0 && _colDiffuse.g() == 0 && _colDiffuse.b() == 0)
+		tglDisable(_toGlLight(lightno));
+	else
+		tglEnable(_toGlLight(lightno));
+}
+
+/*static*/
+void TeLightTinyGL::disableAll() {
+	tglDisable(TGL_LIGHTING);
+}
+
+/*static*/
+void TeLightTinyGL::enableAll() {
+	tglEnable(TGL_LIGHTING);
+}
+
+void TeLightTinyGL::draw(TeCamera &camera) {
+	error("TODO: Finish TeLight::draw");
+}
+
+void TeLightTinyGL::update(uint lightno) {
+	if (lightno > TGL_MAX_LIGHTS)
+		error("Invalid light no %d", lightno);
+	const uint glLight = _toGlLight(lightno);
+
+	const float ambient[4] = {_colAmbient.r() / 255.0f, _colAmbient.g() / 255.0f,
+			_colAmbient.b() / 255.0f, 1.0f};
+	tglLightfv(glLight, TGL_AMBIENT, ambient);
+
+	const float diff[4] = {_colDiffuse.r() / 255.0f, _colDiffuse.g() / 255.0f,
+			_colDiffuse.b() / 255.0f, 1.0f};
+	tglLightfv(glLight, TGL_DIFFUSE, diff);
+
+	// WORKAROUND: Original game sets 0.01 as threshold here to avoid enabling
+	// the "shadow" light.  However, Syberia CitStation/31130 has shadowlight with
+	// values (4, 0, 0) which means it gets enabled and everything is dark.
+
+	if (diff[0] < 0.02f && diff[1] < 0.02f && diff[2] < 0.02f)
+		tglDisable(glLight);
+
+	const float spec[4] = {_colSpecular.r() / 255.0f, _colSpecular.g() / 255.0f,
+			_colSpecular.b() / 255.0f, 1.0f};
+	tglLightfv(glLight, TGL_SPECULAR, spec);
+
+	if (_type == LightTypeSpot || _type == LightTypePoint) {
+		const float pos[4] = {_position3d.x(), _position3d.y(), _position3d.z(), 1.0f};
+		tglLightfv(glLight, TGL_POSITION, pos);
+		tglLightf(glLight, TGL_CONSTANT_ATTENUATION, _constAtten);
+		tglLightf(glLight, TGL_LINEAR_ATTENUATION, _linearAtten);
+		tglLightf(glLight, TGL_QUADRATIC_ATTENUATION, _quadraticAtten);
+	}
+
+	if (_type == LightTypeDirectional) {
+		const TeVector3f32 dirv = directionVector();
+		const float dir[4] = {dirv.x(), dirv.y(), dirv.z(), 0.0f};
+		tglLightfv(glLight, TGL_POSITION, dir);
+	}
+
+	if (_type == LightTypeSpot) {
+		const TeVector3f32 dirv = directionVector();
+		const float dir[4] = {dirv.x(), dirv.y(), dirv.z(), 0.0f};
+		tglLightfv(glLight, TGL_SPOT_DIRECTION, dir);
+		tglLightf(glLight, TGL_SPOT_CUTOFF, (_cutoff * 180.0f) / M_PI);
+		// Exponent doesn't get set in Syberia 2
+		if (g_engine->gameType() == TetraedgeEngine::kSyberia)
+			tglLightf(glLight, TGL_SPOT_EXPONENT, _exponent);
+	} else {
+		tglLightf(glLight, TGL_SPOT_CUTOFF, 180.0f);
+	}
+}
+
+/*static*/
+void TeLightTinyGL::updateGlobal() {
+	const TeColor globalAmbient(_globalAmbientColor);
+	const float col[4] = {globalAmbient.r() / 255.0f,
+			globalAmbient.g() / 255.0f, globalAmbient.b() / 255.0f, 1.0f};
+	tglLightModelfv(TGL_LIGHT_MODEL_AMBIENT, col);
+}
+
+} // end namespace Tetraedge