85 lines
2.5 KiB
HLSL
85 lines
2.5 KiB
HLSL
// Part of the Irrlicht Engine Shader example.
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// These simple Direct3D9 pixel and vertex shaders will be loaded by the shaders
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// example. Please note that these example shaders don't do anything really useful.
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// They only demonstrate that shaders can be used in Irrlicht.
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//-----------------------------------------------------------------------------
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// Global variables
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//-----------------------------------------------------------------------------
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float4x4 mWorldViewProj; // World * View * Projection transformation
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float4x4 mInvWorld; // Inverted world matrix
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float4x4 mTransWorld; // Transposed world matrix
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float3 mLightPos; // Light position (actually just camera-pos in this case)
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float4 mLightColor; // Light color
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// Vertex shader output structure
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struct VS_OUTPUT
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{
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float4 Position : POSITION; // vertex position
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float4 Diffuse : COLOR0; // vertex diffuse color
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float2 TexCoord : TEXCOORD0; // tex coords
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};
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VS_OUTPUT vertexMain(in float4 vPosition : POSITION,
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in float3 vNormal : NORMAL,
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float2 texCoord : TEXCOORD0 )
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{
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VS_OUTPUT Output;
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// transform position to clip space
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Output.Position = mul(vPosition, mWorldViewProj);
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// transform normal somehow (NOTE: for the real vertex normal you would use an inverse-transpose world matrix instead of mInvWorld)
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float3 normal = mul(float4(vNormal,0.0), mInvWorld);
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// renormalize normal
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normal = normalize(normal);
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// position in world coordinates (NOTE: not sure why transposed world is used instead of world?)
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float3 worldpos = mul(mTransWorld, vPosition);
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// calculate light vector, vtxpos - lightpos
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float3 lightVector = worldpos - mLightPos;
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// normalize light vector
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lightVector = normalize(lightVector);
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// calculate light color
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float3 tmp = dot(-lightVector, normal);
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tmp = lit(tmp.x, tmp.y, 1.0);
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tmp = mLightColor * tmp.y;
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Output.Diffuse = float4(tmp.x, tmp.y, tmp.z, 0);
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Output.TexCoord = texCoord;
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return Output;
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}
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// Pixel shader output structure
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struct PS_OUTPUT
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{
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float4 RGBColor : COLOR0; // Pixel color
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};
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sampler2D myTexture;
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PS_OUTPUT pixelMain(float2 TexCoord : TEXCOORD0,
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float4 Position : POSITION,
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float4 Diffuse : COLOR0 )
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{
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PS_OUTPUT Output;
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float4 col = tex2D( myTexture, TexCoord ); // sample color map
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// multiply with diffuse and do other senseless operations
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Output.RGBColor = Diffuse * col;
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Output.RGBColor *= 4.0;
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return Output;
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}
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