From 756c2326d4e5ece3238c1242b4863e4da4f7f46d Mon Sep 17 00:00:00 2001
From: blobt <klm777x7@gmail.com>
Date: Thu, 13 Aug 2020 09:07:20 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A4=9A=E5=B1=8F=E5=AF=B9=E6=AF=94=E9=9B=BE?=
 =?UTF-8?q?=E7=9A=84density?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .vs/shader3/v14/.suo | Bin 50688 -> 50688 bytes
 main.cpp             |  73 ++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 65 insertions(+), 8 deletions(-)

diff --git a/.vs/shader3/v14/.suo b/.vs/shader3/v14/.suo
index 002eae871ed0e9ae4c55ebe95cf3886a93fa2951..a25c18f45700f1f97d2fd1e1697a017ed9abac70 100644
GIT binary patch
delta 1756
zcmc(fZA@EL7{~9qeIK{wtsO0NaL2o>V_m6`724gphAk|E6_IV(g7^}Y#6V$nQ)IEs
ze!@!VeKKUzE$kW%E`S?nZjs=q5~IT<TjH{BCd@CsBq|zWq6y-28fqH$#c!UQU(UVH
z^PJ~A=YP*Rk(eqHQ;jx|>}%d#yn)NjY-kESAi4Bq{!K#4fv5}o+c}P_LXIG1NGVc+
zh=>mPdwqSq9(xUP5OE+|kY^Bdty^G7T_kT&zph7vuwgV~Z$vT>(}s-&XX5(~<S}F?
zQjP3FoXBpZ24Qh->>o#Jkve1#!t5UGvycYFi};Ye$bOE4H`Lp*bMT$TrJ4bYtB7~%
z4M)*&49R2FLR9mEAw-QSF|<H}<>*|)VQjgqF)7leVYbcEFdLIbjijVuHYN>|rDU@#
zmFP&9g-xbKTLtpJ%CeQoLZgO3t?Ud4?DrZFwiXDgN@>^`CA?cl|FUR#c_sq#tztMa
zZ3p+f51Mb5!gn7W&~<Sqafl9jZyv|*TE)aG4g74!A~BKzbfo?a%Ll7ZI;iMbCbIbz
zQU$M?myF3RmzOptge_Abx+e8Z*i<2~>S}>Sem8_`T8yL#J@z!O@GXAyBCNqsg$*vn
zwX~@CAyIO8rJR?or?XUf1OA`x9J%<Q@O&)z>r2D1-BtuARQWVvm53bJr{OGYaB!vs
zoV<aC``;q)%}3d=>=5DTtx@{9!$-hBZlgB)_sJKq*?-Ua(bRV5!zCrY=Z}Kg_`|P{
zVO9$`x2;gowVc5eC7ARPMOAJc2cZRt)=OWiDBt=75!gc6+4*<D;j$P++#(e_CW$^>
zLxJrbj7&DAl2^KT<#}Gt4+!iG@<=KN4d=&*?D|Tdt`#cT1_ufqsN`XR3CWh78lg!F
z34iW8sAlS?sey^wL=X!n^^Ixqu=?U%SS<1??b_MsZ3BtH(xF-`NNz3!$yx{9BTvyQ
zBkcqdEfSUF1fPK`=W;QFiW`Q@y+KIyWI)yh9ju(Y4imj+Gf^+XG-It>+8k4<R&jwx
zjIj8&7uLr#8_Ak1?9xazcJZ*27hvh3Xt0s``xbb)QG#DCw!)3U9(jKRW+qzU)R`WT
z!V>TGf>YUA*`G>)eH39^G%!p89w$DpIbBY-%U@T!vxX+Z2?9esO}GpV42)IjbX~pu
zFI1nBPe=HZW$@cr?nYf2sCdT)6JO|)k%!*(fMx*a;`JaYS_m}?RyHNuEbO9FAxwy$
z`>x)GuyT(a1~Tr2H7N%@BKY6ymd88gaUY!V+tE@Ccj*pTnbO1PxIjD@TLBYu0(HKB
zPpzCaL2$$j<||z!3S{~?j5u<jdCIDsCyJ~kxtQ(gjbm(rzH9Yx|1%#<PKi)D+X${t
zJrJ3W%wC9?|HJY3!J6HK|CrsF?a7M0aVv;()nJ-0B+tRZ)gfJo3!&G574L=4>oXAg
qxCt+mXYumz;c?T;pWFwRV+4!nARHLyZOQ_fy^-K)!Y&bIPWT6e%rr{?

delta 2082
zcmcgtZ%k8H6o2=%v=rJ}v5Xc9JOr^Q3gW`Zru7Y;j5!BX(YU4ZXS5ETW0e+$$h33#
ziMr5t+#)7h@JSZ4nFabXqi%6^y2Ke1VN3k5B?hM7mbfkB!?I;_=aiN~W3q3%&F`Ii
z&pr3vbI<wR(@<Cw3Ts9-v1OB+D|o|{`2834{=4i6wU-}e%m_@I*Okk0+@nNWljvI$
z(uOh((S)!gb|GpIIfxE~h**yJ8`rNunUBau2#6{KZA)_**pIkN($}Ii$NM&|BQC94
zeOx-^RW@$}c4^7;D7PWDC&n+LY(!WP%?LMQ2Vy6p1(Ah#89{3oH%~&h7iB9V4*`Q|
zzZitGk^AFs++~?+uMXHTBkKRch2$!=WJt8Ar>jy}M1%oB*Q2nIU20fJM`0nE8Wz$C
zIF}k0R7YBh9vc}Qnn&FKOJq!Vlsae_(kW(MDdFXUe&&M11-DGB7-uL3<UhDIB@isU
zpbA+t3~X&yusF*>bUtO#pU90p7<g&tTkhKj>}B8GhoZ7V@Mv<?m{VkOqhzEM@r$-m
zgN<PZ&kovEdySq4q2+u!5n|z#xt1mq_Z(`73k%xdt}uEBZ?Cq)hv#%^;mTPSmFk#@
zBZ5&D|Fzs2R!VuL;XkethUjD#%#;hT=jw?1Rk@4F&NnTm@*3S^k<y)A_dIpChd&xv
zdK-&mr1wE&NFJvKEkjISN>s);KH9*H=w?*pwZQMF)viJ%xUI!d$r~WJrWtP7D`9R;
zlZnxLDMTdqf#BL^BMmARDdiF^{2pk4nZv7~=}b-r(SjkQ2>8!<;QZHS%i!RVn%a#u
zRrp(1T~%2n_l97$-)1rUys!G&yuP5XGq`?Vpd5bfE}#W0*)z$OIurNU>+q#|_#^L@
zwhWI-dauqoj4bN?hOu$Db+QFwVpA5?1ahaLl1u#H%dU5T-|vFZ{uuOhmB84$1yC!w
zEGwlKF6&*B?XNAf-1}rW?*|x>E~TfY4MNKuszY)zBkh_xD?0=bZ0FOHPmn07&e@Di
z*{xGr`Dp!3mUI^5HlGkmNgLBD+j(UhFSp!GW!fFM&Tq*44NnUou&G-Ps65uY&73Aa
zeg^sF$mBRGacNu#!|n#pdzEY<0WjU~WG5*dhCo+GkKfn5ejiNrm$7g>MS^IETb#nt
zUMMRyv-m8Gzdxc)<D?Yzisk!y4;~D3_V|3=hk84_n79f|Tp=ygEb2p{KU)<K#qjm`
zMG*VMTt+W!QKLGx2_cbdrE07%#$dzi)k}S}Wh}THa7s^myuLn9r{C`h$cIDuT^(Lu
z&qhy=FW^Bd?30+kU%*Lh(kI4H;CIQwbrVN5oN8o}(rFKH&<599>yZBGFg;oUQ>{;8
z;mD8o+cjB`Hn15)MF-6T#tbUaL`P{!<lv`)Y%q%Xz(gk$`Rn4Q$>d5434uTT_3-lt
zZjgiB@afnN__ntj9-hs@-7}zQ?+x{aXA`3`6K|LCOMhlWvH3hB(WlSa6DxG~(YV?C
zXNfUXC^<qu$L+a8bq5>$StZ%JuvOk@v3$e{a<+{X13SG1#A7k#xH%dMF*t55zzX(?
zBI}fKrbJluOvnnMi&_{u>VO}Qw!+cu+RVN<A1SB1VK%xIPOP&)@Z&JFul9oXLM6l|
zLNGCDg_+X=+`MoJ(nnqD)r++ZW>hn@PuN&B6lJf5u`2>R#BIkW1a<K91MFPvGmU&z
KRIV}Qit!(o!LBj@

diff --git a/main.cpp b/main.cpp
index 68e1e20..9780955 100644
--- a/main.cpp
+++ b/main.cpp
@@ -72,7 +72,16 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 
 	glewInit();
 
-	//combine program
+	//init fsqgpu program
+	GPUProgram fsqProgram;
+	fsqProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	fsqProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad.fs");
+	fsqProgram.Link();
+	fsqProgram.DetectAttribute("pos");
+	fsqProgram.DetectAttribute("texcoord");
+	fsqProgram.DetectUniform("U_MainTexture");
+
+	//gpu program
 	GPUProgram gpuProgram;
 	gpuProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/forg.vs");
 	gpuProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/forg.fs");
@@ -140,16 +149,26 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 
 	glm::mat4 cubeModelMatrix3 = glm::translate<float>(-0.4f, 0.0f, -20.0f) * glm::rotate(-30.0f, 1.0f, 1.0f, 1.0f);
 	glm::mat4 cubeNormalMatrix3 = glm::inverseTranspose(cubeModelMatrix);
-
-
 	//glm::mat4 viewMatrix = glm::lookAt(glm::vec3(1.0f, 0.5f, -10.0f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(0.0f, 1.0f, 0.0f));
 	glm::mat4 projectionMatrix = glm::perspective(50.0f, (float)viewportWidth / (float)viewportHeight, 0.1f, 1000.0f);
 	
+	//初始化fsq
+	FullScreenQuad fsq;
+	fsq.Init();
+
+	//初始化2个fbo
+	FBO fbo[2];
+	fbo[0].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
+	fbo[0].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
+	fbo[0].Finish();
+	fbo[1].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
+	fbo[1].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
+	fbo[1].Finish();
 
 	ShowWindow(hwnd, SW_SHOW);
 	UpdateWindow(hwnd);
 
-	glClearColor(0.6f, 0.6f, 0.6f, 1.0f);
+	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 	MSG msg;
 	while (true)
 	{
@@ -163,7 +182,6 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 			DispatchMessage(&msg);
 		}
 		glEnable(GL_DEPTH_TEST);
-		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		glUseProgram(gpuProgram.mProgram);
 
 		
@@ -184,25 +202,64 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		glUniform1f(gpuProgram.GetLocation("U_FogStart"), fogStart);
 		glUniform1f(gpuProgram.GetLocation("U_FogEnd"), fogEnd);
 		glUniform4fv(gpuProgram.GetLocation("U_FogColor"), 1, fogColor);
-		glUniform1f(gpuProgram.GetLocation("U_FogDensity"), fogDensity);
 
+
+		fbo[0].Bind();
+		fogDensity = 0.11;
+		glUniform1f(gpuProgram.GetLocation("U_FogDensity"), fogDensity);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix));
 		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix));
 		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
 		cube.Draw();
-
 		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix2));
 		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix2));
 		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
 		cube.Draw();
+		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix3));
+		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix3));
+		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
+		cube.Draw();
+		fbo[0].Unbind();
 
-
+		fbo[1].Bind();
+		fogDensity = 0.31;
+		glUniform1f(gpuProgram.GetLocation("U_FogDensity"), fogDensity);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix));
+		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix));
+		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
+		cube.Draw();
+		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix2));
+		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix2));
+		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
+		cube.Draw();
 		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix3));
 		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix3));
 		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
 		cube.Draw();
+		fbo[1].Unbind();
 		glUseProgram(0);
 		glFlush();
+
+
+		
+		glClearColor(0.6f, 0.6f, 0.6f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		glActiveTexture(GL_TEXTURE0);
+		
+		glUseProgram(fsqProgram.mProgram);
+		glBindTexture(GL_TEXTURE_2D, fbo[0].GetBuffer("color"));
+		glUniform1i(fsqProgram.GetLocation("U_MainTexture"), 0);
+		fsq.DrawToLeftTop(fsqProgram.GetLocation("pos"), fsqProgram.GetLocation("texcoord"));
+
+		glBindTexture(GL_TEXTURE_2D, fbo[1].GetBuffer("color"));
+		glUniform1i(fsqProgram.GetLocation("U_MainTexture"), 0);
+		fsq.DrawToRightTop(fsqProgram.GetLocation("pos"), fsqProgram.GetLocation("texcoord"));
+
+		glUseProgram(0);
+
+		
 		SwapBuffers(dc);
 	}
 	return 0;