Render to texture
Author
I want to render to 3 textures using the same geometry each loop, is this possible? I think MRT's is the way to go, but I only want to draw the geometry once not 3 times like I am currently doing. thanks.
You should be able to to bind 3 render targets (as long as the video hardware supports this), and use a pixel shader to output to all 3 at once.
What API are you using?
In Direct3D 9, you can use IDirect3DDevice9::SetRenderTarget().
Then, in your pixel shader, you'd use the output semantics COLOR0, COLOR1, etc to output to different RTs. See here.
What API are you using?
In Direct3D 9, you can use IDirect3DDevice9::SetRenderTarget().
Then, in your pixel shader, you'd use the output semantics COLOR0, COLOR1, etc to output to different RTs. See here.
Author
Thanks for the fast reply I am using DX 9.0. I can make and set the render targets fine. They work on my machine. I have read what you are talking about and the shader I have is from DBP and the way DBP works is not like how you would do it in C++, so I'm trying to convert this, perhaps there is some way you can look at the shader and then help me figure out what I need to do. Thank you.
Author
ok thank you here is the shader...
I have this shader working but I have to draw the geometry 4 times, also, I'm sure I should be able to draw it once, but the shader needs to be modified, to output to 3 render targets. Thanks.
//====================================================// Deferred Shading// By EVOLVED//====================================================//--------------// un-tweaks//-------------- matrix WorldVP:WorldViewProjection; matrix World:World; matrix Worldit:WorldInverseTranspose; matrix ViewInv:ViewInverse; //--------------// tweaks//-------------- float WorldSize=1000; float3 Ambient = {0.1f, 0.1f, 0.1f}; float Heightvec = 0.025; float BiasHeight = 0.25;//--------------// Textures//-------------- texture BaseTX < string Name=""; >; sampler2D Base = sampler_state { texture = <BaseTX>; }; texture NormalTX < string Name=""; >; sampler2D Normal = sampler_state { texture = <NormalTX>; }; texture HeightTX < string Name=""; >; sampler2D Height = sampler_state { texture = <HeightTX>; }; texture WorldPosTX < string Name = " "; >; sampler2D WorldPos=sampler_state { Texture=<WorldPosTX>; ADDRESSU = CLAMP; ADDRESSV = CLAMP; ADDRESSW = CLAMP; MagFilter = None; MinFilter = None; MipFilter = None; }; texture LightingTX < string Name=""; >; sampler2D Lighting = sampler_state { texture = <LightingTX>; ADDRESSU = CLAMP; ADDRESSV = CLAMP; ADDRESSW = CLAMP; MagFilter = None; MinFilter = None; MipFilter = None; };//--------------// structs //-------------- struct input { float4 Pos:POSITION; float2 UV:TEXCOORD; float3 Normal:NORMAL; float3 Tangent:TANGENT; float3 Binormal:BINORMAL; }; struct output { float4 OPos:POSITION; float2 Tex:TEXCOORD0; float4 Proj:TEXCOORD1; float3 ViewVec:TEXCOORD2; }; struct In_WorldPos { float4 Pos:POSITION; }; struct Out_WorldPos { float4 OPos:POSITION; float3 Wpos:TEXCOORD1; }; struct In_WorldDepth { float4 Pos:POSITION; }; struct Out_WorldDepth { float4 OPos:POSITION; float3 Wpos:TEXCOORD1; float4 Proj:TEXCOORD2; }; struct In_WorldNormals { float4 Pos:POSITION; float2 UV:TEXCOORD; float3 Normal:NORMAL; float3 Tangent:TANGENT; float3 Binormal:BINORMAL; }; struct Out_WorldNormals { float4 OPos:POSITION; float2 Tex:TEXCOORD0; float3 ViewVec:TEXCOORD1; float3 tbnRow1:TEXCOORD2; float3 tbnRow2:TEXCOORD3; float3 tbnRow3:TEXCOORD4; };//--------------// vertex shader//-------------- output VS(input IN) { output OUT; OUT.OPos=mul(IN.Pos,WorldVP); OUT.Tex=IN.UV; float4 Vp=float4(OUT.OPos.x*0.5+0.5*OUT.OPos.w,0.5*OUT.OPos.w- OUT.OPos.y*0.5,OUT.OPos.w,OUT.OPos.w); OUT.Proj=Vp+float4(0.01,0.01,0,0); float3x3 TBN={IN.Tangent,IN.Binormal,IN.Normal}; float3 WPos=mul(IN.Pos,World); float3 ViewPos=ViewInv[3].xyz-WPos; OUT.ViewVec=mul(ViewPos,transpose(mul(TBN,World))); return OUT; } Out_WorldPos VS_WorldPos(In_WorldPos IN) { Out_WorldPos OUT; OUT.OPos=mul(IN.Pos,WorldVP); OUT.Wpos=0.5f+mul(IN.Pos,World)/WorldSize; return OUT; } Out_WorldDepth VS_WorldDepth(In_WorldDepth IN) { Out_WorldDepth OUT; OUT.OPos=mul(IN.Pos,WorldVP); OUT.Wpos=mul(IN.Pos,World); float4 Vp=float4(OUT.OPos.x*0.5+0.5*OUT.OPos.w,0.5*OUT.OPos.w- OUT.OPos.y*0.5,OUT.OPos.w,OUT.OPos.w); OUT.Proj=Vp+float4(0.01,0.01,0,0); return OUT; } Out_WorldNormals VS_WorldNormals(In_WorldNormals IN) { Out_WorldNormals OUT; OUT.OPos=mul(IN.Pos,WorldVP); OUT.Tex=IN.UV; float3x3 TBN={IN.Tangent,IN.Binormal,IN.Normal}; float3 WPos=mul(IN.Pos,World); float3 ViewPos=ViewInv[3].xyz-WPos; OUT.ViewVec=mul(ViewPos,transpose(mul(TBN,World))); TBN=mul(TBN,Worldit); OUT.tbnRow1=TBN[0]; OUT.tbnRow2=TBN[1]; OUT.tbnRow3=TBN[2]; return OUT; }//--------------// pixel shader//-------------- float4 PS(output IN) : COLOR { float3 View=normalize(IN.ViewVec); float HeightTex=tex2D(Height,IN.Tex).x+BiasHeight; float2 NewUv=(Heightvec*HeightTex-0.02)*View+IN.Tex; float3 Texture=tex2D(Base,NewUv); float3 Light=tex2Dproj(Lighting,IN.Proj)*1.25; return float4(Texture*(Light+Ambient),1); } float4 PS_WorldPos(Out_WorldPos IN) : COLOR { return float4(IN.Wpos,1); } float4 PS_WorldDepth(Out_WorldDepth IN) : COLOR { float3 WPos=(tex2Dproj(WorldPos,IN.Proj)*2-1)*(WorldSize/2); WPos=0.5f+(IN.Wpos-WPos)/(WorldSize/200); return float4(WPos,1); } float4 PS_WorldNormals(Out_WorldNormals IN) : COLOR { float3 View=normalize(IN.ViewVec); float HeightTex=tex2D(Height,IN.Tex).x+BiasHeight; float2 NewUv=(Heightvec*HeightTex-0.02)*View+IN.Tex; return float4(0.5f+mul(tex2D(Normal,NewUv)*2-1,float3x3(IN.tbnRow1,IN.tbnRow2,IN.tbnRow3))*0.5f,1); }//--------------// techniques //-------------- technique Texture { pass p1 { vertexShader = compile vs_2_0 VS(); pixelShader = compile ps_2_0 PS(); } } technique WorldPos { pass p1 { vertexShader = compile vs_2_0 VS_WorldPos(); pixelShader = compile ps_2_0 PS_WorldPos(); //vertexShader = compile vs_2_0 VS_WorldNormals(); // pixelShader = compile ps_2_0 PS_WorldNormals(); } } technique WorldDepth { pass p1 { vertexShader = compile vs_2_0 VS_WorldDepth(); pixelShader = compile ps_2_0 PS_WorldDepth(); } } technique WorldNormals { pass p1 { vertexShader = compile vs_2_0 VS_WorldNormals(); pixelShader = compile ps_2_0 PS_WorldNormals(); } }I have this shader working but I have to draw the geometry 4 times, also, I'm sure I should be able to draw it once, but the shader needs to be modified, to output to 3 render targets. Thanks.
I think you'll need a new structure to output from the pixel shader (instead of a single colour value), something like this:
Then modify your pixel shader to use it:
Also, I believe you need to set the render target colours in order - you can't set COLOR1 without first setting COLOR0, etc.
struct PSOutput{ float4 RT0 : COLOR0; // 3 render targets float4 RT1 : COLOR1; float4 RT2 : COLOR2;};Then modify your pixel shader to use it:
PSOutput PS(output IN){ // Initialise the structure PSOutput Out = (PSOutput)0; float3 View=normalize(IN.ViewVec); float HeightTex=tex2D(Height,IN.Tex).x+BiasHeight; float2 NewUv=(Heightvec*HeightTex-0.02)*View+IN.Tex; float3 Texture=tex2D(Base,NewUv); float3 Light=tex2Dproj(Lighting,IN.Proj)*1.25; // return float4(Texture*(Light+Ambient),1); // Fill out the structure and return it Out.RT0 = float4(Texture*(Light+Ambient),1); Out.RT1 = float4(1.0, 0, 0, 1.0); // Red Out.RT2 = float4(0, 1.0, 0, 1.0); // Green return Out;}Also, I believe you need to set the render target colours in order - you can't set COLOR1 without first setting COLOR0, etc.
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