basicshader.cg

3D Game Engine Design Source Code非常棒

void vmain(
    // In order for this shader to work, your Geometry object must
    // have all of the inputs or the Renderer will give you an
    // assertion error.
    in float4 i_f4Position  : POSITION,
    in float3 i_f3Normal : NORMAL,
    in float2 i_f2Tex : TEXCOORD0,

    out float4 o_f4Position : POSITION,
    out float3 o_f3Lighting : COLOR,
    out float2 o_f2Tex : TEXCOORD0,
    // State variables beginning with Wml will be filled in by
    // WildMagic automatically
    // Some, like lights, must be attached to the scene graph.
    uniform float4x4 WmlRendererModViewProj,
    uniform float4x4 WmlRendererMod,
    // Wildmagic will fill out constants to a float4, but you
    // can specify float<n> if you don't need the other information
    uniform float3 WmlLightPosition0,
    uniform float3 WmlLightAmbient0,
    uniform float3 WmlLightDiffuse0)
{
    // Transform the position
    o_f4Position = mul(WmlRendererModViewProj, i_f4Position);

    // Calculate the diffuse lighting
    
    // This is a point light, so we calculate the world position first
    // (Because model->view transform is really a 3x3, we'll save some
    // instructions by changing it to that.
    float3 f3WorldPos = mul((float3x3)WmlRendererMod,(float3)i_f4Position);

    // Transform the normal
    float3 f3WorldNorm = mul((float3x3)WmlRendererMod,i_f3Normal);

    // Calculate the (negative) light direction
    float3 f3LightDir = (WmlLightPosition0 - f3WorldPos);

    float fDiffuse = dot(f3LightDir, f3WorldNorm);

    // We'll pass the lighting value out as a color
    o_f3Lighting = WmlLightDiffuse0 * fDiffuse + WmlLightAmbient0;

    // Pass through the texture coordinte
    o_f2Tex = i_f2Tex;
}

void pmain(
    in float3 i_f3Lighting : COLOR,
    in float2 i_f2Tex : TEXCOORD0,

    out float3 o_f3Color : COLOR,

    uniform sampler2D s2Tex)
{
    // Lookup texture with coordinates
    float3 f3TexColor = tex2D(s2Tex, i_f2Tex ).rgb;

    // Multiply tex color with lighting
    o_f3Color = i_f3Lighting * f3TexColor;
}