terrain multitexturing shader

• 1. tiled - tiling can be specified with entity skill41(u) and skill42(v)
• 2. tiled - tiling can be specified with entity skill43(u) and skill44(v)
• 3. not tiled - this texture's alpha channel specifies how the first two textures get blended. (the pixelshader additionally adds (signed) this texture's color channels but you could comment out this line if you don't need this.)

material mat_terrain_multitexture

{

	effect=

	"	

		texture texSkin1;

		texture texSkin2;

		texture texSkin3;



		matrix matWorldViewProj;

		matrix matWorld;

		matrix matWorldView;



		vector vecSunDir;

		vector vecDiffuse;

		vector vecAmbient;

		vector vecLight;

		vector vecFog;

		vector vecSkill41;

            

		technique multitexture

		{

			pass p0

			{

				Texture[0]=<texSkin1>;

				Texture[1]=<texSkin2>;

				Texture[2]=<texSkin3>;



				MagFilter[2]=linear;

				MinFilter[2]=linear;

				MipFilter[2]=linear;



				ZWriteEnable=true;



				VertexShaderConstant[0]=<matWorldViewProj>;

				VertexShaderConstant[4]=<matWorld>;

				VertexShaderConstant[8]=<matWorldView>;

    

				VertexShaderConstant[16]=<vecSunDir>;

				VertexShaderConstant[17]=<vecDiffuse>;

				VertexShaderConstant[18]=<vecAmbient>;

				VertexShaderConstant[19]=<vecLight>;

				VertexShaderConstant[20]=<vecFog>;

				VertexShaderConstant[64]=<vecSkill41>; //(u_scale1, v_scale1, u_scale2, v_scale2)

				VertexShaderConstant[95]=(0.0f,0.0f,0.0f,0.0f);

				

				VertexShader=

				decl

				{

					stream 0;

					float v0[3]; //position

					float v3[3]; //normal

					float v7[2]; //uv

				}

				asm

				{

					vs.1.1

					m4x4 oPos,v0,c0           // transform position to clip space



					m3x3 r0,v3,c4             // transform normal to world space

					dp3 r0.w,r0,r0            // renormalize it

					rsq r0.w,r0.w

					mul r0,r0,r0.w



					dp3 r0,r0,-c16            // normal.light -> lighting constant

					mul r0.xyz,r0,c17         // modulate against material diffuse color

					add oD0.xyz,r0,c19        // add environment light



					mov r1.w,c20.w            // r1.w=1

					dp4 r0,v0,c10             // distance to camera position

					add r0,r0,-c20.x          // distance-fog_start

					mad r0.x,-r0.x,c20.z,r1.w // 1-(distance-fog_start)*(1/(fog_end-fog_start))

					max oFog.x,r0.x,c95.w     // clamp with custom max value



					mul oT0.xy,v7.xy,c64.xy   // output scaled uvs - stage 0

					mul oT1.xy,v7.xy,c64.zw   // output scaled uvs - stage 1

					mov oT2.xy,v7.xy          // output uvs - stage 2

				};

				

				PixelShader= 

				asm

				{

					ps.1.3

					def c0,0,0,0,1

					tex t0                  // sample t0

					tex t1                  // sample t1

					tex t2                  // sample t2		

					lrp r0.rgb,t2.a,t0,t1   // blend t0 with t1 using the alpha channel of t2

					+mov r0.a,c0

					//add r0.rgb,r0,t2_bias // add(signed) rgb of t2

					mul r0.rgb,r0,v0        // modulate with diffuse vertex lighting

				};

			}

		}

	";

}



starter mat_terrain_multitexture_init

{

	vec_set(mat_terrain_multitexture.ambient_blue,mat_terrain.ambient_blue);

	vec_set(mat_terrain_multitexture.diffuse_blue,mat_terrain.diffuse_blue);

	vec_set(mat_terrain_multitexture.specular_blue,mat_terrain.specular_blue);

	mat_terrain_multitexture.power=mat_terrain.power;

}

In Antwort auf:

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i think because of the + it runs parallel to

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now that sounds interesting. does this work for all commands?

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(what exactly is a detail map, is it overlayed on your tiled mipmap?}

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Is it possible to have a map as a lightmap to do shadows (not tiled)??

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yes, a third texture would be possible! the limit is how many texture stages the hardware supports in one pass and most current cards support 4. for more textures you would have to do multipass rendering which is slow because it's like rendering the terrain several times...

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Its me bothering Ventilator again . So, care to enlighten me about adding a third texture? I don't even know eher to start. I wanted to test it out to see how it worked.

Hey. I was wanting to add a third tiled texture to the mix. About the topic clutter, I guess I should have stared a new thread for all of ramblings... sorry about that .

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but i would have to check wolfgang engels shader fundamentals again to see how that works.

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Is that a push? Are you trying to get me to learn? How dare you!

yes, the problem gets caused by invalid swizzling!

try to replace

lrp r0.rgb,t3.b,r0,t2 // blend the result with t2 depending on t3 blue
+mov r0.a,c0

with:

mov r1.a,t3.b
lrp r0.rgb,r1.a,r0,t2 // blend the result with t2 depending on t3 blue
+mov r0.a,c0

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The .b replicate functionality is available in ps.1.1 - ps.1.3 since the release of DirectX 8.1, but this swizzle is only valid together with an alpha write mask in the destination register of an instruction [...]

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should you add mimaps for the tileable skins??

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thanks for your reply, i tried it like you explained it in the linked thread, but it still doesn't work. i have to paint in the red,blue,green,alpha channels of my last tga skin, to set the blending thing, right ?
do you have a terrain file with your skins and alpha ? this would really help, you'll get 5 stars!

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Quote:

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Okay... here is a link to download a small test level I made.
termultitex.cd.zip (approx. 2.26 MB)
You'll find the shader_terrain.wdl file that is for ps1.1 and copied from ventilators shader.

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Hi Eric,

I'm trying to get this to function. Your Demo exe works beautifully. But when I try to add the shader_terrain.wdl to my own project I get a bunch of syntax errors on the script. (I'm going to try and insert an image here)



Any idea what might be going on? The script looks perfect to me, and the syntax checker in SED reports no errors.

Im running A6 Commercial.