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EMI: Factor out makeFrustumMatrix

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This commit is contained in:
Dries Harnie 2014-11-23 23:10:51 +01:00
parent f832487ce4
commit e06056e7be
1 changed files with 15 additions and 13 deletions
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28
engines/grim/gfx_opengl_shaders.cpp
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@ -191,6 +191,20 @@ Math::Matrix4 makeRotationMatrix(const Math::Angle& angle, Math::Vector3d axis)
return rotate;
}
Math::Matrix4 makeFrustumMatrix(double left, double right, double bottom, double top, double nclip, double fclip) {
Math::Matrix4 proj;
proj(0, 0) = (2.0f * nclip) / (right - left);
proj(1, 1) = (2.0f * nclip) / (top - bottom);
proj(2, 0) = (right + left) / (right - left);
proj(2, 1) = (top + bottom) / (top - bottom);
proj(2, 2) = -(fclip + nclip) / (fclip - nclip);
proj(2, 3) = -1.0f;
proj(3, 2) = -(2.0f * fclip * nclip) / (fclip - nclip);
proj(3, 3) = 0.0f;
return proj;
}
GfxBase *CreateGfxOpenGL() {
return new GfxOpenGLS();
}
@ -428,21 +442,9 @@ void GfxOpenGLS::setupCameraFrustum(float fov, float nclip, float fclip) {
_fov = fov; _nclip = nclip; _fclip = fclip;
float right = nclip * tan(fov / 2 * (LOCAL_PI / 180));
float left = -right;
float top = right * 0.75;
float bottom = -right * 0.75;
Math::Matrix4 proj;
proj(0, 0) = (2.0f * nclip) / (right - left);
proj(1, 1) = (2.0f * nclip) / (top - bottom);
proj(2, 0) = (right + left) / (right - left);
proj(2, 1) = (top + bottom) / (top - bottom);
proj(2, 2) = -(fclip + nclip) / (fclip - nclip);
proj(2, 3) = -1.0f;
proj(3, 2) = -(2.0f * fclip * nclip) / (fclip - nclip);
proj(3, 3) = 0.0f;
_projMatrix = proj;
_projMatrix = makeFrustumMatrix(-right, right, -top, top, nclip, fclip);
}
void GfxOpenGLS::positionCamera(const Math::Vector3d &pos, const Math::Vector3d &interest, float roll) {