聚光灯

Res/point_light.fs

@@ -15,20 +15,9 @@ void main(){
 
 	//diffuse
 	vec3 n = normalize(V_Normal.xyz);
-	vec3 l = normalize(U_LightPos.xyz - V_WorldPos.xyz);
+	vec3 l = normalize(U_LightPos - vec3(0));
 	float duffuseIntensity = max(0.0, dot(l,n));
-	
-	//·½Ïò¹âË¥¼õ¼ÆËã
-	float attenuation = 1.0;
-	float distance = 0;
-	float constantFactor = 0.5;
-	float linearFactor = 0.3;
-	float expFactor = 0.1;
-
-	distance =length(U_LightPos.xyz - V_WorldPos.xyz);
-	attenuation = 1.0 / (constantFactor + linearFactor*distance + expFactor*distance*distance);
-
-	vec4 duffuseColor = U_DiffuseMaterial * U_DiffuseLight * duffuseIntensity * attenuation;
+	vec4 duffuseColor = U_DiffuseMaterial * U_DiffuseLight * duffuseIntensity;
 
 	//specular
 	vec4 specularColor = vec4(0);

Res/spot_light.fs

@@ -0,0 +1,57 @@
+uniform vec4 U_AmbientMaterial;
+uniform vec4 U_AmbientLight;
+uniform vec4 U_DiffuseMaterial;
+uniform vec4 U_DiffuseLight;
+uniform vec4 U_SpecularMaterial;
+uniform vec4 U_SpecularLight;
+uniform vec4 U_LightPos;
+uniform vec4 U_CameraPos;
+uniform vec4 U_LightDirection;
+uniform vec4 U_LightOption;
+varying vec4 V_Normal;
+varying vec4 V_WorldPos;
+
+void main(){
+	//ambient
+	vec4 ambientColor = U_AmbientMaterial * U_AmbientLight;
+
+	//diffuse
+	vec3 n = normalize(V_Normal.xyz);
+	vec3 l = normalize(U_LightPos.xyz - V_WorldPos.xyz);
+	float duffuseIntensity = max(0.0, dot(l,n));
+	
+	//¾Û¹â¼ÆËã
+	float attenuation = 1.0;
+	float distance = 0;
+	float constantFactor = 0.5;
+	float linearFactor = 0.3;
+	float expFactor = 0.1;
+
+	distance =length(U_LightPos.xyz - V_WorldPos.xyz);
+	attenuation = 1.0 / (constantFactor + linearFactor*distance + expFactor*distance*distance);
+
+	if(duffuseIntensity > 0){
+		vec3 spot_direction = normalize(U_LightDirection.xyz);
+		float currentCosThta = max(0.0, dot(-l, spot_direction)); 
+		float radianCutoff = U_LightDirection.w * 3.14 / 180;
+		float cosThta = cos(radianCutoff);
+		if(currentCosThta > cosThta) {
+			duffuseIntensity = pow(currentCosThta, U_LightOption.x)*U_LightOption.y;
+		} else {
+			duffuseIntensity = 0.0;
+		}
+	}
+
+	vec4 duffuseColor = U_DiffuseMaterial * U_DiffuseLight * duffuseIntensity * attenuation;
+
+	//specular
+	vec4 specularColor = vec4(0);
+	if(duffuseIntensity > 0){
+		vec3 rd = normalize(reflect(-l,n));
+		vec3 vd = normalize((U_CameraPos - V_WorldPos).xyz);
+		float specularIntensity = pow(max(0.0,dot(vd,rd)), 128);
+		specularColor = U_SpecularMaterial * U_SpecularLight * specularIntensity;
+	}
+
+	gl_FragColor = ambientColor + duffuseColor + specularColor;
+}

Res/spot_light.vs

@@ -0,0 +1,14 @@
+attribute vec4 position;
+attribute vec4 texcoord;
+attribute vec4 normal;
+uniform mat4 ModelMatrix;
+uniform mat4 ProjectionMatrix;
+uniform mat4 ViewMatrix;
+uniform mat4 IT_ModelMatrix;
+varying vec4 V_Normal;
+varying vec4 V_WorldPos;
+void main(){
+	V_WorldPos = ModelMatrix * position;
+	V_Normal = IT_ModelMatrix * normal;
+	gl_Position = ProjectionMatrix * ViewMatrix * ModelMatrix * position;
+}

scene.cpp

@@ -12,8 +12,8 @@ FullScreenQuad *fsq;
 
 void Init()
 {
-	model.Init("Res/Sphere.obj");
-	model.mShader->Init("Res/point_light.vs", "Res/point_light.fs");
+	model.Init("Res/Cube.obj");
+	model.mShader->Init("Res/spot_light.vs", "Res/spot_light.fs");
 	model.SetPosition(0.0f, 0.0f, 0.0f);
 
 	//设置环境光参数
@@ -21,7 +21,7 @@ void Init()
 	model.mShader->SetVec4("U_AmbientLight", 0.1f, 0.1f, 0.1f, 1.0f);
 	
 	//设置环境光参数
-	model.mShader->SetVec4("U_LightPos", 0.0f, 1.4f, 0.0f, 0.0f);
+	model.mShader->SetVec4("U_LightPos", 0.0f, 1.8f, 0.0f, 0.0f);
 	model.SetDiffuseMaterial(0.4f, 0.4f, 0.4f, 1.0f);
 	model.mShader->SetVec4("U_DiffuseLight", 0.8f, 0.8f, 0.8f, 1.0f);
 
@@ -29,6 +29,10 @@ void Init()
 	model.SetSpecularMaterial(1.0f, 1.0f, 1.0f, 1.0f);
 	model.mShader->SetVec4("U_SpecularLight", 1.0f, 1.0f, 1.0f, 1.0f);
 
+	//设置聚光灯参数
+	model.mShader->SetVec4("U_LightDirection", 0.0f, -1.0f, 0.0f, 15.0f);//15.0是cutoff
+	model.mShader->SetVec4("U_LightOption", 32.0f, 2.0f, 0.0f, 0.0f);
+	
 	viewMatrix = glm::lookAt(cameraPos, glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
 	fsq = new FullScreenQuad();
 	fsq->Init();