122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
#include "engine_camera.h"
|
|
#include "engine_math.h"
|
|
|
|
mat4f_t GetPerspectiveProjection(PerspectiveProjection* Perspective)
|
|
{
|
|
mat4f_t ProjectionMatrix;
|
|
|
|
float AspectRatio = Perspective->Width / Perspective->Height;
|
|
float TanFactor = tanf((DEG2RAD*Perspective->VerticalFov) / 2.0);
|
|
|
|
ProjectionMatrix.mat[0] = 1.0 / (AspectRatio * TanFactor);
|
|
ProjectionMatrix.mat[1] = 0.0f;
|
|
ProjectionMatrix.mat[2] = 0.0f;
|
|
ProjectionMatrix.mat[3] = 0.0f;
|
|
|
|
ProjectionMatrix.mat[4] = 0.0f;
|
|
ProjectionMatrix.mat[5] = (1.0 / TanFactor);
|
|
ProjectionMatrix.mat[6] = 0.0f;
|
|
ProjectionMatrix.mat[7] = 0.0f;
|
|
|
|
ProjectionMatrix.mat[8] = 0.0f;
|
|
ProjectionMatrix.mat[9] = 0.0f;
|
|
ProjectionMatrix.mat[10] = (Perspective->Near + Perspective->Far) /
|
|
(Perspective->Near - Perspective->Far);
|
|
ProjectionMatrix.mat[11] = -1.0f;
|
|
|
|
ProjectionMatrix.mat[12] = 0.0f;
|
|
ProjectionMatrix.mat[13] = 0.0f;
|
|
ProjectionMatrix.mat[14] = (2*Perspective->Far*Perspective->Near) /
|
|
(Perspective->Near - Perspective->Far);
|
|
ProjectionMatrix.mat[15] = 0.0f;
|
|
|
|
return ProjectionMatrix;
|
|
}
|
|
|
|
mat4f_t GetGeneralView(GeneralCamera* Cam)
|
|
{
|
|
mat4f_t ViewMat;
|
|
|
|
vec3f_t w = NormalizeVec3f(SubtractVec3f(Cam->LookAt, Cam->Origin));
|
|
vec3f_t u = NormalizeVec3f(CrossProductVec3f(Cam->Up, w));
|
|
vec3f_t v = CrossProductVec3f(w, u);
|
|
|
|
ViewMat.mat[0] = u.x;
|
|
ViewMat.mat[1] = v.x;
|
|
ViewMat.mat[2] = w.x;
|
|
ViewMat.mat[3] = 0.0f;
|
|
|
|
ViewMat.mat[4] = u.y;
|
|
ViewMat.mat[5] = v.y;
|
|
ViewMat.mat[6] = w.y;
|
|
ViewMat.mat[7] = 0.0f;
|
|
|
|
ViewMat.mat[8] = u.z;
|
|
ViewMat.mat[9] = v.z;
|
|
ViewMat.mat[10] = w.z;
|
|
ViewMat.mat[11] = 0.0f;
|
|
|
|
ViewMat.mat[12] = -DotProductVec3f(u, Cam->Origin);
|
|
ViewMat.mat[13] = -DotProductVec3f(v, Cam->Origin);
|
|
ViewMat.mat[14] = -DotProductVec3f(w, Cam->Origin);
|
|
ViewMat.mat[15] = 1.0f;
|
|
|
|
return ViewMat;
|
|
|
|
}
|
|
|
|
mat4f_t GetFirstPersonView(FirstPersonCamera* Cam)
|
|
{
|
|
mat4f_t ViewMat;
|
|
|
|
float PitchCos = cos(DEG2RAD * Cam->Pitch);
|
|
float PitchSin = sin(DEG2RAD * Cam->Pitch);
|
|
float YawCos = cos(DEG2RAD * Cam->Yaw);
|
|
float YawSin = sin(DEG2RAD * Cam->Yaw);
|
|
|
|
vec3f_t u = Vec3f(YawCos, 0.0f, YawSin);
|
|
vec3f_t v = Vec3f(PitchSin * YawSin, PitchCos, -(PitchSin * YawCos));
|
|
vec3f_t w = Vec3f(-(PitchCos * YawSin), PitchSin, PitchCos * YawCos);
|
|
|
|
ViewMat.mat[0] = u.x;
|
|
ViewMat.mat[1] = v.x;
|
|
ViewMat.mat[2] = w.x;
|
|
ViewMat.mat[3] = 0.0f;
|
|
|
|
ViewMat.mat[4] = u.y;
|
|
ViewMat.mat[5] = v.y;
|
|
ViewMat.mat[6] = w.y;
|
|
ViewMat.mat[7] = 0.0f;
|
|
|
|
ViewMat.mat[8] = u.z;
|
|
ViewMat.mat[9] = v.z;
|
|
ViewMat.mat[10] = w.z;
|
|
ViewMat.mat[11] = 0.0f;
|
|
|
|
ViewMat.mat[12] = -DotProductVec3f(u, Cam->Position);
|
|
ViewMat.mat[13] = -DotProductVec3f(v, Cam->Position);
|
|
ViewMat.mat[14] = -DotProductVec3f(w, Cam->Position);
|
|
ViewMat.mat[15] = 1.0f;
|
|
|
|
return ViewMat;
|
|
}
|
|
|
|
vec3f_t FPCamFront(FirstPersonCamera* Cam)
|
|
{
|
|
vec3f_t Front;
|
|
|
|
Front.x = (cos(DEG2RAD * Cam->Pitch)*sin(DEG2RAD * Cam->Yaw));
|
|
Front.y = -sin(DEG2RAD * Cam->Pitch);
|
|
Front.z = -(cos(DEG2RAD * Cam->Pitch) * cos(DEG2RAD * Cam->Yaw));
|
|
|
|
return NormalizeVec3f(Front);
|
|
|
|
}
|
|
|
|
vec3f_t FPCamRight(vec3f_t Front)
|
|
{
|
|
vec3f_t Up = Vec3f(0.0f, 1.0f, 0.0f);
|
|
|
|
return CrossProductVec3f(NormalizeVec3f(Front), Up);
|
|
}
|