llviewercamera.h

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#ifndef LL_LLVIEWERCAMERA_H
#define LL_LLVIEWERCAMERA_H

#include "llcamera.h"
#include "lltimer.h"
#include "llstat.h"
#include "m4math.h"

class LLCoordGL;
class LLViewerObject;

// This rotation matrix moves the default OpenGL reference frame 
// (-Z at, Y up) to Cory's favorite reference frame (X at, Z up)
const F32 OGL_TO_CFR_ROTATION[16] = {  0.f,  0.f, -1.f,  0.f,   // -Z becomes X
                                                                          -1.f,  0.f,  0.f,  0.f,       // -X becomes Y
                                                                           0.f,  1.f,  0.f,  0.f,       //  Y becomes Z
                                                                           0.f,  0.f,  0.f,  1.f };

const BOOL FOR_SELECTION = TRUE;
const BOOL NOT_FOR_SELECTION = FALSE;

class LLViewerCamera : public LLCamera, public LLSingleton<LLViewerCamera>
{
public:
        LLViewerCamera();

//      const LLVector3 &getPositionAgent() const;
//      const LLVector3d &getPositionGlobal() const;

        void updateCameraLocation(const LLVector3 &center,
                                                                const LLVector3 &up_direction,
                                                                const LLVector3 &point_of_interest);

        static void updateFrustumPlanes(LLCamera& camera, BOOL ortho = FALSE, BOOL zflip = FALSE);
        void setPerspective(BOOL for_selection, S32 x, S32 y_from_bot, S32 width, S32 height, BOOL limit_select_distance, F32 z_near = 0, F32 z_far = 0);

        const LLMatrix4 &getProjection() const;
        const LLMatrix4 &getModelview() const;

        // Warning!  These assume the current global matrices are correct
        void projectScreenToPosAgent(const S32 screen_x, const S32 screen_y, LLVector3* pos_agent ) const;
        BOOL projectPosAgentToScreen(const LLVector3 &pos_agent, LLCoordGL &out_point, const BOOL clamp = TRUE) const;
        BOOL projectPosAgentToScreenEdge(const LLVector3 &pos_agent, LLCoordGL &out_point) const;


        LLStat *getVelocityStat() { return &mVelocityStat; }
        LLStat *getAngularVelocityStat() { return &mAngularVelocityStat; }

        void getPixelVectors(const LLVector3 &pos_agent, LLVector3 &up, LLVector3 &right);
        LLVector3 roundToPixel(const LLVector3 &pos_agent);

        void setDefaultFOV(F32 fov) { mCameraFOVDefault = fov; }
        F32 getDefaultFOV() { return mCameraFOVDefault; }

        BOOL cameraUnderWater() const;

        const LLVector3 &getPointOfInterest() { return mLastPointOfInterest; }
        BOOL areVertsVisible(LLViewerObject* volumep, BOOL all_verts);
        F32 getPixelMeterRatio() const                          { return mPixelMeterRatio; }
        S32 getScreenPixelArea() const                          { return mScreenPixelArea; }

        void setZoomParameters(F32 factor, S16 subregion) { mZoomFactor = factor; mZoomSubregion = subregion; }
        F32 getZoomFactor() { return mZoomFactor; }                             
        S16 getZoomSubRegion() { return mZoomSubregion; } 

protected:
        void calcProjection(const F32 far_distance) const;

        LLStat mVelocityStat;
        LLStat mAngularVelocityStat;
        mutable LLMatrix4       mProjectionMatrix;      // Cache of perspective matrix
        mutable LLMatrix4       mModelviewMatrix;
        F32                                     mCameraFOVDefault;
        LLVector3                       mLastPointOfInterest;
        F32                                     mPixelMeterRatio; // Divide by distance from camera to get pixels per meter at that distance.
        S32                                     mScreenPixelArea; // Pixel area of entire window
        F32                                     mZoomFactor;
        S16                                     mZoomSubregion;

public:
};

extern F64 gGLModelView[16];
extern F64 gGLLastModelView[16];
extern F64 gGLProjection[16];
extern S32 gGLViewport[4];
extern F32 gGLZNear;
extern F32 gGLZFar;

#endif // LL_LLVIEWERCAMERA_H

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