diff --git a/.vs/shader3/v14/.suo b/.vs/shader3/v14/.suo
index eed7516..e4bb53a 100644
Binary files a/.vs/shader3/v14/.suo and b/.vs/shader3/v14/.suo differ
diff --git a/FBO.cpp b/FBO.cpp
index 79625f0..84df702 100644
--- a/FBO.cpp
+++ b/FBO.cpp
@@ -23,7 +23,7 @@ void FBO::AttachColorBuffer(const char*bufferName, GLenum attachment, GLenum dat
 	glBindTexture(GL_TEXTURE_2D, 0);
 	glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, colorBuffer, 0);
 	
-	mDrawBuffers.push(attachment);
+	mDrawBuffers.push_back(attachment);
 	mBuffers.insert(std::pair<std::string,GLuint>(bufferName,colorBuffer));
 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }
@@ -52,10 +52,9 @@ void FBO::Finish()
 	{
 		GLenum *buffers = new GLenum[nCount];
 		int i = 0;
-		while (!mDrawBuffers.empty())
+		while (i < nCount)
 		{
-			buffers[i++] = mDrawBuffers.top();
-			mDrawBuffers.pop();
+			buffers[i++] = mDrawBuffers[i];
 		}
 		glBindFramebuffer(GL_FRAMEBUFFER, mFBO);
 		glDrawBuffers(nCount, buffers);
diff --git a/FBO.h b/FBO.h
index ee822ba..bbc73d8 100644
--- a/FBO.h
+++ b/FBO.h
@@ -1,14 +1,14 @@
 #pragma once
 #include "glew.h"
 #include <map>
-#include <stack>
+#include <vector>
 
 class FBO
 {
 public:
 	GLuint mFBO;
 	std::map<std::string, GLuint> mBuffers;
-	std::stack<GLenum> mDrawBuffers;
+	std::vector<GLenum> mDrawBuffers;
 public:
 	FBO();
 	//hdr/normal color
diff --git a/main.cpp b/main.cpp
index 7e7abe0..eaa4a4a 100644
--- a/main.cpp
+++ b/main.cpp
@@ -90,14 +90,15 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	hdrProgram.DetectAttribute("texcoord");
 	hdrProgram.DetectUniform("U_MainTexture");
 
-	//init dilation program
-	GPUProgram gaussianProgram;
-	gaussianProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
-	gaussianProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad_gaussian.fs");
-	gaussianProgram.Link();
-	gaussianProgram.DetectAttribute("pos");
-	gaussianProgram.DetectAttribute("texcoord");
-	gaussianProgram.DetectUniform("U_MainTexture");
+	//combine program
+	GPUProgram combineProgram;
+	combineProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	combineProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/combine.fs");
+	combineProgram.Link();
+	combineProgram.DetectAttribute("pos");
+	combineProgram.DetectAttribute("texcoord");
+	combineProgram.DetectUniform("U_MainTexture");
+	combineProgram.DetectUniform("U_HDRTexture");
 
 	//init gpu program
 	GPUProgram gpuProgram;
@@ -167,7 +168,8 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	fbo.Finish();
 
 	FBO HDRfbo;
-	HDRfbo.AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA16F, viewportWidth, viewportHeight);
+	HDRfbo.AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
+	HDRfbo.AttachColorBuffer("hdrcolor", GL_COLOR_ATTACHMENT1, GL_RGBA16F, viewportWidth, viewportHeight);
 	HDRfbo.AttachDepthBuffer("depth", viewportWidth, viewportHeight);
 	HDRfbo.Finish();
 
@@ -225,14 +227,18 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		fsq.DrawToLeftTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));
 		
 		glUseProgram(hdrProgram.mProgram);
-		glBindTexture(GL_TEXTURE_2D, HDRfbo.GetBuffer("color"));
+		glBindTexture(GL_TEXTURE_2D, HDRfbo.GetBuffer("hdrcolor"));
 		glUniform1i(hdrProgram.GetLocation("U_MainTexture"), 0);
 		fsq.DrawToRightTop(hdrProgram.GetLocation("pos"), hdrProgram.GetLocation("texcoord"));
 
-		glUseProgram(gaussianProgram.mProgram);
+		glUseProgram(combineProgram.mProgram);
 		glBindTexture(GL_TEXTURE_2D, HDRfbo.GetBuffer("color"));
-		glUniform1i(gaussianProgram.GetLocation("U_MainTexture"), 0);
-		fsq.DrawToRightBottom(gaussianProgram.GetLocation("pos"), gaussianProgram.GetLocation("texcoord"));
+		glUniform1i(combineProgram.GetLocation("U_MainTexture"), 0);
+
+		glActiveTexture(GL_TEXTURE1);
+		glBindTexture(GL_TEXTURE_2D, HDRfbo.GetBuffer("hdrcolor"));
+		glUniform1i(combineProgram.GetLocation("U_HDRTexture"), 1);
+		fsq.DrawToRightBottom(combineProgram.GetLocation("pos"), combineProgram.GetLocation("texcoord"));
 
 		SwapBuffers(dc);
 	}
diff --git a/res/shader/combine.fs b/res/shader/combine.fs
new file mode 100644
index 0000000..4824ae5
--- /dev/null
+++ b/res/shader/combine.fs
@@ -0,0 +1,9 @@
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_MainTexture;
+uniform sampler2D U_HDRTexture;
+
+void main()
+{
+	gl_FragColor = texture2D(U_MainTexture, V_Texcoord) + texture2D(U_HDRTexture, V_Texcoord);
+}
\ No newline at end of file
diff --git a/res/shader/hdr.fs b/res/shader/hdr.fs
index 4b12c09..0c26809 100644
--- a/res/shader/hdr.fs
+++ b/res/shader/hdr.fs
@@ -66,5 +66,14 @@ void main()
 	vec3 VD = normalize(U_EyePos - V_WorldPos);
 	vec4 specularColor =  U_SpecularLightColor * U_SpecularMaterial * pow(max(0.0, dot(RD,VD)) ,128);
 
-	gl_FragColor = (ambientColor + diffuseColor) * 10.0;
+	//gl_FragColor = ambientColor + diffuseColor;
+
+	vec4 color = ambientColor + diffuseColor;
+	
+
+	if(color.r > 1.0){
+		gl_FragData[1] = color;
+	} else {
+		gl_FragData[0] = color;
+	}
 }
\ No newline at end of file
diff --git a/shader3.vcxproj b/shader3.vcxproj
index 4b9fadf..f834c86 100644
--- a/shader3.vcxproj
+++ b/shader3.vcxproj
@@ -82,6 +82,7 @@
     <ClInclude Include="utils.h" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="res\shader\combine.fs" />
     <None Include="res\shader\fullscreenquad.vs" />
     <None Include="res\shader\fullscreenquad_gaussian.fs" />
     <None Include="res\shader\fullscreenquad_gaussian_horizontal.fs" />
diff --git a/shader3.vcxproj.filters b/shader3.vcxproj.filters
index be527bb..ce15ea6 100644
--- a/shader3.vcxproj.filters
+++ b/shader3.vcxproj.filters
@@ -70,5 +70,8 @@
     <None Include="res\shader\fullscreenquad.vs">
       <Filter>src</Filter>
     </None>
+    <None Include="res\shader\combine.fs">
+      <Filter>src</Filter>
+    </None>
   </ItemGroup>
 </Project>
\ No newline at end of file