added specular, ambient light,...

need to fix the texutre gamma correction,
look at the todos

QtMeshViewer/Header/FileInterface.h

@@ -44,6 +44,8 @@ struct Material {
 	QString name;
 	QOpenGLTexture* texture = Q_NULLPTR;
 	bool transparent = false;
+	float shininess = 80;						//TODO: read from file
+	QVector3D specularColor = {1.0,1.0,1.0};	//TODO: read from file
 };
 
 class FileInterface : public QObject

QtMeshViewer/Header/OglViewerWidget.h

@@ -39,7 +39,9 @@ private:
 
 	struct {
 		QVector3D position = { 1,1,1 };
-		QVector3D intensities = { 1,0.25,0.25 };
+		QVector3D intensities = { 1,1,1 };
+		float attenuationFactor = 0.2f;
+		float ambientCoefficient = 0.005f;
 	} m_light;
 
 	QOpenGLShaderProgram m_program;

QtMeshViewer/Resources/fshader.glsl

@@ -5,51 +5,68 @@ precision mediump float;
 #endif
 
 uniform mat3 n_matrix;
+uniform vec3 cameraPosition;
+
 uniform sampler2D texture;
+uniform float materialShininess;
+uniform vec3 materialSpecularColor;
+
+uniform bool b_transparent;
+uniform bool b_light;
 
 uniform struct Light {
 	vec3 position;
 	vec3 intensities;
+	float attenuationFactor;
+	float ambientCoefficient;
 } light;
 
-uniform bool b_transparent;
-uniform bool b_light;
-
 varying vec2 v_surfaceUV;
 varying vec3 v_surfacePosition;
 varying vec3 v_surfaceNormal;
 
 void main()
 {
-	// variables
-	vec3 diffuse;
-
-	// get fragment color from texture
-	vec4 surfaceColor = vec4(texture2D(texture, v_surfaceUV));
-
-	// if not transparent, ignore alpha value and set it to 1
-	if(!b_transparent)
-		surfaceColor.a = 1.0f;
-
 	if(b_light)
 	{
-		// calculate normals in worldspace
+		// some values
 		vec3 normalWorld = normalize(n_matrix * v_surfaceNormal);
-
-		//get the surface - light vector (cause this is a point light)
+		vec4 surfaceColor = vec4(texture2D(texture, v_surfaceUV));
+		if(!b_transparent)
+			surfaceColor.a = 1.0f;
 		vec3 surfaceToLight = normalize(light.position - v_surfacePosition);
+		vec3 surfaceToCamera = normalize(cameraPosition - v_surfacePosition);
 
-		// calculate the brightness depending on the angle
+		// ambient
+		vec3 ambient = light.ambientCoefficient * surfaceColor.rgb * light.intensities;
+
+		// diffuse
 		float diffuseCoefficient = max(0.0, dot(normalWorld, surfaceToLight));
+		vec3 diffuse = diffuseCoefficient * surfaceColor.rgb * light.intensities;
 
-		// result diffuse color
-		diffuse = diffuseCoefficient * surfaceColor.rgb * light.intensities;
+		// specular
+		float specularCoefficient = 0.0;
+		if(diffuseCoefficient > 0.0)
+			specularCoefficient = pow(max(0.0, dot(surfaceToCamera, reflect(-surfaceToLight, normalWorld))), materialShininess);
+		vec3 specular = specularCoefficient * materialSpecularColor * light.intensities;
+
+		// attenuation
+		float distanceToLight = length(light.position - v_surfacePosition);
+		float attenuation = 1.0 / (1.0 + light.attenuationFactor * pow(distanceToLight, 2));
+
+		// linear color before gamma correction)
+		vec3 linearColor = ambient + attenuation * (diffuse + specular);
+
+		// final color after gama correction
+		vec3 gamma = vec3(1.0/2.2);
+		gl_FragColor = vec4(pow(linearColor, gamma), surfaceColor.a);
 	}
 	else
 	{
-		diffuse = surfaceColor.rgb;
-	}
+		vec4 surfaceColor = vec4(texture2D(texture, v_surfaceUV));
+		if(!b_transparent)
+			surfaceColor.a = 1.0f;
 
-	// put all together
-	gl_FragColor = vec4(diffuse, surfaceColor.a);
+		gl_FragColor = surfaceColor;
+	}
 }

QtMeshViewer/Source/GeometryEngine.cpp

@@ -176,12 +176,16 @@ void GeometryEngine::drawGeometry(QOpenGLShaderProgram *program, bool wireframe)
 	for (auto& it : m_drawList)
 	{
 		bool tmp_transparent(false);
+		float shininess;
+		QVector3D specularColor;
 
 		// bind the correct texture
 		if (it.textureIndex < m_materials->size() && m_materials->at(it.textureIndex).texture != Q_NULLPTR)
 		{
 			m_materials->at(it.textureIndex).texture->bind();
 			tmp_transparent = m_materials->at(it.textureIndex).transparent;
+			shininess = m_materials->at(it.textureIndex).shininess;
+			specularColor = m_materials->at(it.textureIndex).specularColor;
 		}
 		else
 		{
@@ -197,6 +201,10 @@ void GeometryEngine::drawGeometry(QOpenGLShaderProgram *program, bool wireframe)
 		// decide if this is transparent
 		program->setUniformValue("b_transparent", tmp_transparent);
 
+		// set some material attributes
+		program->setUniformValue("materialShininess", shininess);
+		program->setUniformValue("materialSpecularColor", specularColor);
+
 		// Draw cube geometry using indices from VBO 1
 		if(wireframe)
 			glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

QtMeshViewer/Source/MshFile.cpp

@@ -217,6 +217,7 @@ void MshFile::analyseMatdChunks(std::list<ChunkHeader*>& chunkList)
 {
 	for (auto& it : chunkList)
 	{
+		// TODO: don't load default texture, make it NULL
 		//TODO: get information from flags
 		// attributes
 		if (!strcmp("ATRB", it->name))

QtMeshViewer/Source/OglViewerWidget.cpp

@@ -234,6 +234,13 @@ void OglViewerWidget::paintGL()
 	m_program.setUniformValue("b_light", m_lightOn);
 	m_program.setUniformValue("light.position", m_light.position);
 	m_program.setUniformValue("light.intensities", m_light.intensities);
+	m_program.setUniformValue("light.attenuationFactor", m_light.attenuationFactor);
+	m_program.setUniformValue("light.ambientCoefficient", m_light.ambientCoefficient);
+
+	// Set camera position
+	QMatrix4x4 rotateBack;
+	rotateBack.rotate(m_rotation.inverted());
+	m_program.setUniformValue("cameraPosition", rotateBack * (-m_translation));
 
 	// Draw cube geometry
 	m_dataEngine->drawGeometry(&m_program, m_wireframe);