渲染阴影

main.cpp

@@ -164,6 +164,9 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	gpuProgram.DetectUniform("U_SpecularLightColor");
 	gpuProgram.DetectUniform("U_SpecularMaterial");
 	gpuProgram.DetectUniform("U_EyePos");
+	gpuProgram.DetectUniform("U_LightProjection");
+	gpuProgram.DetectUniform("U_LightViewMatrix");
+	gpuProgram.DetectUniform("U_ShadowMap");
 
 	//init 3d model
 	ObjModel obj, quad, sphere;
@@ -256,21 +259,6 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	glUseProgram(0);
 	depthfbo.Unbind();
 
-
-	MSG msg;
-	while (true)
-	{
-		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE))
-		{
-			if (msg.message == WM_QUIT)
-			{
-				break;
-			}
-			TranslateMessage(&msg);
-			DispatchMessage(&msg);
-		}
-
-
 	HDRfbo.Bind();
 	glUseProgram(gpuProgram.mProgram);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -289,6 +277,11 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	glUniformMatrix4fv(gpuProgram.GetLocation("V"), 1, GL_FALSE, glm::value_ptr(viewMatrix));
 	glUniformMatrix4fv(gpuProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));
 	glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(normalMatrix));
+	glUniformMatrix4fv(gpuProgram.GetLocation("U_LightProjection"), 1, GL_FALSE, glm::value_ptr(lightprojectionMatrix));
+	glUniformMatrix4fv(gpuProgram.GetLocation("U_LightViewMatrix"), 1, GL_FALSE, glm::value_ptr(lightMatrix));
+	glBindTexture(GL_TEXTURE_2D, depthfbo.GetBuffer("depth"));
+	glUniform1i(gaussianProgram.GetLocation("U_ShadowMap"), 0);
+
 	obj.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
 	obj.Draw();
 
@@ -346,7 +339,20 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	fbo[1].Unbind();
 	/* blur end */
 
-		glFlush();
+
+	MSG msg;
+	while (true)
+	{
+		if (PeekMessage(&msg, NULL, NULL, NULL, PM_REMOVE))
+		{
+			if (msg.message == WM_QUIT)
+			{
+				break;
+			}
+			TranslateMessage(&msg);
+			DispatchMessage(&msg);
+		}
+
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		glActiveTexture(GL_TEXTURE0);
 
@@ -374,6 +380,7 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		glUniform1i(combineProgram.GetLocation("U_HDRTexture"), 1);
 		fsq.DrawToRightBottom(combineProgram.GetLocation("pos"), combineProgram.GetLocation("texcoord"));
 
+		glFlush();
 		SwapBuffers(dc);
 	}
 	return 0;

res/shader/hdr.fs

@@ -10,9 +10,21 @@ uniform vec3 U_EyePos;
 uniform vec4 U_SpecularLightColor;
 uniform vec4 U_SpecularMaterial;
 
+uniform sampler2D U_ShadowMap;
 
 varying vec3 V_Normal;
 varying vec3 V_WorldPos;
+varying vec4 V_LightSpaceFragPos;
+
+float CalculateShadow(){
+	vec3 fragPos = V_LightSpaceFragPos.xyz/V_LightSpaceFragPos.w;
+	fragPos = fragPos * 0.5 + vec3(0.5);
+
+	float depthInShadowMap = texture2D(U_ShadowMap, fragPos.xy).r;
+	float currentDepth = fragPos.z;
+	float shadow = currentDepth > depthInShadowMap ? 1.0 : 0.0;
+	return shadow;
+}
 
 void main()
 {
@@ -68,7 +80,7 @@ void main()
 
 	//gl_FragColor = ambientColor + diffuseColor;
 
-	vec4 color = ambientColor + diffuseColor;
+	vec4 color = ambientColor + diffuseColor * vec4(vec3(1.0 - CalculateShadow()),1.0);
 	
 
 	gl_FragData[0] = color;

res/shader/test.vs

@@ -7,13 +7,20 @@ uniform mat4 P;
 uniform mat4 V;
 uniform mat4 NM;//Normal Matrix 使用来修正法线的
 
+uniform mat4 U_LightProjection;
+uniform mat4 U_LightViewMatrix;
+
 varying vec3 V_Normal;
 varying vec3 V_WorldPos;
+varying vec4 V_LightSpaceFragPos;
+
 void main()
 {
 	V_Normal = mat3(NM)*normal;
 	vec4 worldPos = M * vec4(pos, 1.0);
 	V_WorldPos = worldPos.xyz;
 
+	V_LightSpaceFragPos = U_LightProjection * U_LightViewMatrix * worldPos;
+
 	gl_Position=P*V*M*vec4(pos,1.0);
 }

shader3.vcxproj

@@ -87,6 +87,7 @@
     <None Include="res\shader\hdr.fs" />
     <None Include="res\shader\sample_depth_buffer.fs" />
     <None Include="res\shader\sample_depth_buffer.vs" />
+    <None Include="res\shader\test.vs" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

shader3.vcxproj.filters

@@ -61,5 +61,8 @@
     <None Include="res\shader\fullscreenquad.vs">
       <Filter>src</Filter>
     </None>
+    <None Include="res\shader\test.vs">
+      <Filter>src</Filter>
+    </None>
   </ItemGroup>
 </Project>