Version vom 31. Oktober 2008, 16:14 Uhr

Shadername

Zurück zur Shadersammlung

Bilder

Die Originaltextur...

...und die Normalmap...

ergeben zusammen mit einer Lichtposition ein plastisches Bild.

Beschreibung

kommt noch...

Besondere Vorraussetzungen

kommt noch...

Code

struct fs_res {
  float4 color : COLOR;
};

float3 expand(float3 v)
{
  return (v - 0.5) * 2; // Expand a range-compressed vector
}

fs_res fragment_shader(
  float2 colortexcoords: TEXCOORD0,
  float3 lightdirection: TEXCOORD1,
  float4 color: COLOR,
  uniform sampler2D colormap,
  uniform sampler2D normalmap,
  uniform float  lightintensity,
  uniform float4 ambientcolor  
)
{
  fs_res OUT;
  
  float3 light = expand(lightdirection);
  
  float3 normaltex = tex2D(normalmap, colortexcoords).xyz;
  float3 normal = expand(normaltex);      
  
  OUT.color = (dot(-normal, light) * lightintensity * color + ambientcolor) * tex2D(colormap, colortexcoords);  
  
  return OUT;
}

struct vs_res {
  float4 position : POSITION;
  float4 color    : COLOR;
  float2 colortexcoords: TEXCOORD0;
  float3 lightdirection: TEXCOORD1;
};

vs_res vertex_shader(
  float3 position : POSITION,
  float3 normal : NORMAL,
  float4 color : COLOR,
  float4 colortexcoords : TEXCOORD0,
  uniform float4x4 modelview,
  uniform float3 lightpos,
  uniform float4 lightcolor  
)
{
  vs_res OUT; 
  
  //Transform the vertex position to the world position
  OUT.position = mul(modelview, float4(position, 1));
  
  //Comment this line if you don't want the shader to transform the light position
  //to the world position
  float4 lp = mul(modelview, float4(lightpos, 1));  
 
  //Set the color texture coordinates
  OUT.colortexcoords = colortexcoords;
  //Set the color of the vertex
  OUT.color = color * lightcolor;
  //Stor the light direction in a second texture coordinate vector
  OUT.lightdirection = normalize(position.xyz - lightpos);
  
  return OUT;
}