class RED::RenderShaderLogo

Decal display shader. More...

#include <REDRenderShaderLogo.h>

Inherits: RenderShader.

Public functions:

Public static functions:

Detailed description:

Decal display shader.

This simple shader displays a list of decal textures on a geometry. Each texture's RGB color value is modulated by the texture's own alpha mask value, interpolated with the result of blending all previous logos. Consequently, the shader's lighting equation is:

  // Example for 1 logo:
  output.rgb = logo0.rgb * logo0.a;
  output.a = logo0.a;

  // Example for 2 logos:
  output.rgb = ( logo0.rgb * logo0.a ) * ( 1 - logo1.a ) + logo1.rgb * logo1.a;
  output.a = saturate( logo0.a + logo1.a );

  // Example for 3 logos:
  output.rgb = ( ( logo0.rgb * logo0.a ) * ( 1 - logo1.a ) + logo1.rgb * logo1.a ) * ( 1 - logo2.a ) + logo2.rgb * logo2.a...;
  output.a = saturate( logo0.a + logo1.a + logo2.a );

  // Example for N logos:
  output.rgb = outputN-1.rgb * ( 1 - logoN.a ) + logoN.rgb * logoN.a;
  output.a = saturate( outputN-1.a + logoN.a );

Color and alpha saturation may apply based on the output rendering buffer's format.

This shader uses the following geometrical channels:

• RED::MCL_VERTEX: Vertex array of the rendered meshes.
• RED::MCL_TEX0-7: Texture coordinates of the rendered meshes.

The RenderShaderLogo can be used in a direct or indirect lighting configuration. This is selected at the shader's creation time. A direct shader goes to the RED::MTL_PRELIT pass of the material, whereas an indirect shader goes to its RED::MTL_INDIRECT_PRELIT pass.

This shader creates two platform configurations in direct lighting:

• RED::HW_GENERIC
• RED::HW_SOFT_TRACER

It also creates two platform configurations in indirect lighting:

• RED::HW_NVIDIA_GENERIC
• RED::HW_ATI_GENERIC

See the REDRenderShaderLogo.h file documentation for the list of all define statements used to name all parameters of this shader.

Functions documentation