[2024] | 1 | /////////
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| 2 | ///This example shader demonstrates how to use the sprite particle type added by the GTP to OGRE's particle types.
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| 3 | ///These sprites are quads with zero size, they should be scaled and rotated towards the camera by the vertex shader.
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| 4 | ///All four vertices of the quad are placed in the center of the particle, the z and w components of their texture coordinates
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| 5 | ///gives us the offset they should be moved in camera space (these components store the corner direction multiplied by the particle size).
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| 6 | ///The x and y components of the texture coordinates store the defult uv for texturing.
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| 7 | ////////
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| 8 | struct VS_OUT
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| 9 | {
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| 10 | float4 hPosition : POSITION;
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| 11 | float4 texCoord : TEXCOORD0;
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| 12 | float4 color : COLOR0;
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| 13 | };
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| 14 |
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| 15 | VS_OUT Sprite_VS(float4 position : POSITION,
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| 16 | float4 texCoord : TEXCOORD0,
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| 17 | float4 color : COLOR0,
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| 18 | uniform float4x4 worldView,
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| 19 | uniform float4x4 Proj)
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| 20 | {
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| 21 | VS_OUT OUT;
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| 22 | ///transform to camera space and create a sprite with vertex offset
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| 23 | //texCoord.y = 1.0 - texCoord.y;
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| 24 | float2 offset = texCoord.zw;
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| 25 | float4 cPosition = mul(worldView, position);
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| 26 | cPosition.xy += offset;
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| 27 |
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[2310] | 28 | // cPosition = float4(100*texCoord.xy,0,1);
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[2024] | 29 | ///projection
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| 30 | OUT.hPosition = mul( Proj, cPosition );
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| 31 | OUT.texCoord = texCoord;
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| 32 | // OUT.color = float4(offset,1,1.0);
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| 33 | OUT.color = color;
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| 34 |
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| 35 | return OUT;
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| 36 | }
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| 37 |
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| 38 | ///Simple texture mapping
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| 39 | float4 Sprite_PS(VS_OUT IN ,
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| 40 | uniform sampler2D colorTexture : register(s0)):COLOR
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| 41 | {
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| 42 | return 1;
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| 43 | return tex2D( colorTexture, IN.texCoord.xy) * IN.color;
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| 44 | }
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| 45 |
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| 46 | //////////
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| 47 | ///These shaders uses the sprite particle type. They demonstrate the "spherical billboards" (SBB) particle rendering method.
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| 48 | ///SBB alter the opacity of a particle according to the objects of the scene it intersects. To find out the correct opacity
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| 49 | ///we store scene depth values in a previous step, we assume that the particle is sphere shaped and find the length of the viewray
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| 50 | ///that travells inside a particle before reaching an object.
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| 51 | //////////
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| 52 | struct SBB_VS_OUT
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| 53 | {
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| 54 | float4 hPosition : POSITION;
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| 55 | float4 texCoord : TEXCOORD0;
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| 56 | float3 P : TEXCOORD1;
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| 57 | float3 Q : TEXCOORD2;
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| 58 | float r : TEXCOORD3;
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| 59 | float2 screenCoord : TEXCOORD4;
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| 60 | float4 color : COLOR0;
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| 61 | };
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| 62 |
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| 63 | SBB_VS_OUT SBB_Sprite_VS (float4 position : POSITION,
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| 64 | float4 texCoord : TEXCOORD0,
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| 65 | float4 color : COLOR,
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| 66 | uniform float width,
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| 67 | uniform float height,
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| 68 | uniform float4x4 worldView,
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| 69 | uniform float4x4 Proj)
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| 70 | {
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| 71 | SBB_VS_OUT OUT;
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| 72 | ///transform to camera space and create a sprite with vertex offset
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| 73 | float2 offset = texCoord.zw;
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| 74 | float4 cPosition;
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| 75 | float4 wPosition = position;
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| 76 | cPosition = mul(worldView, wPosition);
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| 77 | /// P is the particle sphere center
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| 78 | OUT.P = cPosition.xyz;
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| 79 | OUT.P.z = - 1 * OUT.P.z;
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| 80 | cPosition.xy += offset;
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| 81 | /// Q is the shaded point (it is moved backwards to avoid unwanted frontplane clipping)
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| 82 | OUT.Q = cPosition.xyz;
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| 83 | OUT.Q.z = OUT.P.z;
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| 84 | OUT.r = abs(texCoord.z);
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| 85 | /// calculate screen space position
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| 86 | OUT.hPosition = mul( Proj, cPosition );
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| 87 | OUT.screenCoord = (OUT.hPosition.xy / OUT.hPosition.w + 1.0) / 2.0;
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| 88 | OUT.screenCoord.y = 1.0 - OUT.screenCoord.y;
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| 89 | OUT.screenCoord += float2(0.5/width, 0.5/height);
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| 90 |
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| 91 | OUT.texCoord = texCoord;
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| 92 | OUT.color = color;
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| 93 |
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| 94 | return OUT;
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| 95 | }
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| 96 |
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| 97 |
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| 98 | float4 SBB_Sprite_PS(SBB_VS_OUT IN ,
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| 99 | // in screenCoord : VPOS,
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| 100 | uniform float nearplane,
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| 101 | uniform float farplane,
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[2054] | 102 | uniform float4 color,
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| 103 | uniform sampler2D colorTexture : register(s0),
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| 104 | uniform sampler2D DepthMap : register(s1),
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| 105 | uniform sampler2D PlanckMap : register(s2)
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[2024] | 106 | ) : COLOR
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| 107 | {
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| 108 | float4 Color = IN.color;
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| 109 | float alpha = 0;
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| 110 |
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| 111 | /// get the depth values from the depthMap and calculate ray length in sphere
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| 112 | float d = length( IN.Q - IN.P );
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| 113 | float Zs;
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| 114 | if( d < IN.r )
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| 115 | {
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| 116 |
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| 117 | float w = sqrt( IN.r * IN.r - d * d );
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| 118 | alpha = w / IN.r;
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| 119 | alpha *= pow( (IN.r-d) / IN.r , 2);
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| 120 |
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| 121 | float F = IN.Q.z - w;
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| 122 | float B = IN.Q.z + w;
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| 123 |
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| 124 |
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| 125 | Zs = tex2D( DepthMap, IN.screenCoord ).r;
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| 126 | if(Zs == 0) Zs = farplane;
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| 127 | float ds = min( Zs, B ) - max( nearplane, F );
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| 128 | // float ds = min( Zs, B ) - F;
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| 129 | alpha *= ds / w * 0.5;
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| 130 |
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| 131 |
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| 132 | }
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| 133 | /// fetch opacity from a texture
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| 134 | Color.a *= tex2D( colorTexture, IN.texCoord.xy).r ;
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| 135 | //Color.a *= IN.color.a;
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| 136 | Color.a *= alpha;
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| 137 | /// address a color map (colors of fire eg.) with the alpha
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| 138 | Color.rgb = tex2D( PlanckMap, Color.aa).rgb;
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| 139 |
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[2054] | 140 | return Color * color;
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[2024] | 141 | }
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| 142 |
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| 143 |
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