实现specular

main.cpp

@@ -79,6 +79,10 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	gpuProgram.DetectUniform("U_DiffuseLightColor");
 	gpuProgram.DetectUniform("U_DiffuseMaterial");
 	gpuProgram.DetectUniform("U_LightPos");
+	gpuProgram.DetectUniform("U_SpecularLightColor");
+	gpuProgram.DetectUniform("U_SpecularMaterial");
+	gpuProgram.DetectUniform("U_EyePos");
+
 	//init 3d model
 	ObjModel model;
 	model.Init("res/model/Sphere.obj");
@@ -94,6 +98,9 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	float diffuseLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
 	float diffuseMaterial[] = { 0.8f,0.8f,0.8f,1.0f };
 	float lightPos[] = {1.0f,1.0f,0.0f};
+	float specularLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
+	float specularMaterial[] = { 1.0f,1.0f,1.0f,1.0f };
+	float eyePos[] = { 0.0f,0.0f,0.0f };
 
 	glm::mat4 modelMatrix = glm::translate<float>(0.0f,0.0f,-3.0f);
 	glm::mat4 projectionMatrix = glm::perspective(50.0f, 800.0f / 600.0f, 0.1f, 1000.0f);
@@ -131,6 +138,10 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		glUniform4fv(gpuProgram.GetLocation("U_DiffuseLightColor"), 1, diffuseLightColor);
 		glUniform4fv(gpuProgram.GetLocation("U_DiffuseMaterial"), 1, diffuseMaterial);
 		glUniform3fv(gpuProgram.GetLocation("U_LightPos"), 1, lightPos);
+		glUniform4fv(gpuProgram.GetLocation("U_SpecularLightColor"), 1, specularLightColor);
+		glUniform4fv(gpuProgram.GetLocation("U_SpecularMaterial"), 1, specularMaterial);
+		glUniform3fv(gpuProgram.GetLocation("U_EyePos"), 1, eyePos);
+
 		model.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
 		model.Draw();
 		glUseProgram(0);

res/shader/test.fs

@@ -3,9 +3,13 @@ uniform vec4 U_AmbientMaterial;
 uniform vec3 U_LightPos;
 uniform vec4 U_DiffuseLightColor;
 uniform vec4 U_DiffuseMaterial;
+uniform vec3 U_EyePos;
+uniform vec4 U_SpecularLightColor;
+uniform vec4 U_SpecularMaterial;
 
 
 varying vec3 V_Normal;
+varying vec3 V_WorldPos;
 
 void main()
 {
@@ -18,5 +22,11 @@ void main()
 	float diffuseIntensity = max(0.0, dot(L,N));
 	vec4 diffuseColor = U_DiffuseLightColor * U_DiffuseMaterial * diffuseIntensity;
 
-	gl_FragColor = ambientColor + diffuseColor;
+	//specular
+	vec3 reflectDir = normalize(reflect(-L,N));//-L是入射光向量，通过reflect函数求到反射光方向
+	vec3 viewDir = normalize(U_EyePos - V_WorldPos);
+	vec4 specularColor = U_SpecularLightColor * U_SpecularMaterial * pow(max(0.0, dot(viewDir,reflectDir)), 64.0);
+
+
+	gl_FragColor = ambientColor + diffuseColor + specularColor;
 }

res/shader/test.vs

@@ -8,8 +8,11 @@ uniform mat4 V;
 uniform mat4 NM;//Normal Matrix 使用来修正法线的
 
 varying vec3 V_Normal;
+varying vec3 V_WorldPos;
 void main()
 {
 	V_Normal = mat3(NM)*normal;
+	V_WorldPos = M * vec4(pos, 1.0);
+
 	gl_Position=P*V*M*vec4(pos,1.0);
 }