#include <revolution/gx.h>#define GXInitLightPosv(lo, vec) \
(GXInitLightPos((lo), *(f32*)(vec), *((f32*)(vec)+1), *((f32*)(vec)+2)))lo |
Pointer to a light object. |
vec |
Position vector. You may use an array of f32 type or structure. |
None.
This macro function sets the position of the light in the light object using a vector structure. The Revolution graphics hardware supports local diffuse lights. The position of the light should be in the same space as a transformed vertex position (i.e., view space).
The memory for the light object must be allocated by the application; this function does not load any hardware registers. To load a light object into a hardware light, use GXLoadLightObjImm or GXLoadLightObjIndx.
You may set an array of f32 values as vec argument.
// Use an array
f32 pos[3] = { 0.0f, 0.0f, 100.0f };
GXLightObj myLightObj;
GXInitLightPosv( &myLightObj, pos );
You can also use a structure which contains three f32 members (like Vec type of matrix-vector library).
// Use a structure
typedef structure
{
f32 x, y, z;
} Point3d;
Point3d pos;
GXLightObj myLightObj;
pos.x = pos.y = pos.z = 0.0f;
GXInitLightPosv( &myLightObj, &pos );
GXLightObj Initialization Flow
2006/03/01 Initial version.
CONFIDENTIAL