Vertex Shader Input

Parameters

The input values for the Vertex Shader are all in the SurfacesStandardVertexIntermediate structure and are passed in as function parameters.

Vertex Shader Input Values	Type	Needed Macros	Meaning
position	vec4	N/A	Local position
normal	vec3	N/A	Local normal
tangent	vec4	CC_SURFACES_USE_TANGENT_SPACE	Local tangent and mirror normal flag
color	vec4	CC_SURFACES_USE_VERTEX_COLOR	Vertex color
texCoord	vec2	N/A	UV0
texCoord1	vec2	CC_SURFACES_USE_SECOND_UV	UV1
clipPos	vec4	N/A	Projected coordinates
worldPos	vec3	N/A	World position
worldNormal	vec4	N/A	World normal and double-sided material flag
worldTangent	vec3	CC_SURFACES_USE_TANGENT_SPACE	World tangent
worldBinormal	vec3	CC_SURFACES_USE_TANGENT_SPACE	World binormal

Macro Switch

When you need to use input parameters with a macro switch, you need to enable the corresponding macro in the macro-remapping code segment. The example code is as follows.

CCProgram macro-remapping %{
    ...
    //Use the second set of UVs
    #define CC_SURFACES_USE_SECOND_UV 1
    //Use the world's binormal
    #define CC_SURFACES_USE_TANGENT_SPACE 1
    ...
}

Usage Example

In any function with SurfacesStandardVertexIntermediate parameters, you can directly access the relevant parameters, taking the SurfacesVertexModifyWorldPos function as an example.

#define CC_SURFACES_VERTEX_MODIFY_WORLD_POS
vec3 SurfacesVertexModifyWorldPos(in SurfacesStandardVertexIntermediate In)
{
    vec3 worldPos = In.worldPos;
    worldPos.x += sin(cc_time.x * worldPos.z);
    worldPos.y += cos(cc_time.x * worldPos.z);
    return worldPos;
}