llhudicon.cpp

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#include "llviewerprecompiledheaders.h"

#include "llhudicon.h"

#include "llgl.h"

#include "llviewerobject.h"
#include "lldrawable.h"
#include "llviewercamera.h"
#include "llviewerimage.h"
#include "llviewerwindow.h"

//-----------------------------------------------------------------------------
// Local consts
//-----------------------------------------------------------------------------
const F32 ANIM_TIME = 0.4f;
const F32 DIST_START_FADE = 15.f;
const F32 DIST_END_FADE = 30.f;
const F32 MAX_VISIBLE_TIME = 15.f;
const F32 FADE_OUT_TIME = 1.f;

//-----------------------------------------------------------------------------
// Utility functions
//-----------------------------------------------------------------------------
static F32 calc_bouncy_animation(F32 x)
{
        return -(cosf(x * F_PI * 2.5f - F_PI_BY_TWO))*(0.4f + x * -0.1f) + x * 1.3f;
}


//-----------------------------------------------------------------------------
// static declarations
//-----------------------------------------------------------------------------
LLHUDIcon::icon_instance_t LLHUDIcon::sIconInstances;

LLHUDIcon::LLHUDIcon(const U8 type) :
                        LLHUDObject(type),
                        mImagep(NULL),
                        mPickID(0),
                        mScale(0.1f),
                        mHidden(FALSE)
{
        sIconInstances.push_back(this);
}

LLHUDIcon::~LLHUDIcon()
{
        mImagep = NULL;
}

void LLHUDIcon::renderIcon(BOOL for_select)
{
        LLGLSUIDefault texture_state;
        LLGLDepthTest gls_depth(GL_TRUE);
        LLGLState no_texture(GL_TEXTURE_2D, for_select ? FALSE : TRUE);

        if (mHidden)
                return;

        if (mSourceObject.isNull() || mImagep.isNull())
        {
                markDead();
                return;
        }

        LLVector3 obj_position = mSourceObject->getRenderPosition();

        // put icon above object, and in front
        // RN: don't use drawable radius, it's fricking HUGE
        LLVector3 icon_relative_pos = (gCamera->getUpAxis() * ~mSourceObject->getRenderRotation());
        icon_relative_pos.abs();

        F32 distance_scale = llmin(mSourceObject->getScale().mV[VX] / icon_relative_pos.mV[VX], 
                mSourceObject->getScale().mV[VY] / icon_relative_pos.mV[VY], 
                mSourceObject->getScale().mV[VZ] / icon_relative_pos.mV[VZ]);
        F32 up_distance = 0.5f * distance_scale;
        LLVector3 icon_position = obj_position + (up_distance * gCamera->getUpAxis()) * 1.2f;

        LLVector3 icon_to_cam = gCamera->getOrigin() - icon_position;
        icon_to_cam.normVec();

        icon_position += icon_to_cam * mSourceObject->mDrawable->getRadius() * 1.1f;

        mDistance = dist_vec(icon_position, gCamera->getOrigin());

        F32 alpha_factor = for_select ? 1.f : clamp_rescale(mDistance, DIST_START_FADE, DIST_END_FADE, 1.f, 0.f);

        LLVector3 x_pixel_vec;
        LLVector3 y_pixel_vec;
        
        gCamera->getPixelVectors(icon_position, y_pixel_vec, x_pixel_vec);

        F32 scale_factor = 1.f;
        if (mAnimTimer.getElapsedTimeF32() < ANIM_TIME)
        {
                scale_factor = llmax(0.f, calc_bouncy_animation(mAnimTimer.getElapsedTimeF32() / ANIM_TIME));
        }

        F32 time_elapsed = mLifeTimer.getElapsedTimeF32();
        if (time_elapsed > MAX_VISIBLE_TIME)
        {
                markDead();
                return;
        }
        
        if (time_elapsed > MAX_VISIBLE_TIME - FADE_OUT_TIME)
        {
                alpha_factor *= clamp_rescale(time_elapsed, MAX_VISIBLE_TIME - FADE_OUT_TIME, MAX_VISIBLE_TIME, 1.f, 0.f);
        }

        F32 image_aspect = (F32)mImagep->mFullWidth / (F32)mImagep->mFullHeight;
        LLVector3 x_scale = image_aspect * (F32)gViewerWindow->getWindowHeight() * mScale * scale_factor * x_pixel_vec;
        LLVector3 y_scale = (F32)gViewerWindow->getWindowHeight() * mScale * scale_factor * y_pixel_vec;

        LLVector3 lower_left = icon_position - (x_scale * 0.5f);
        LLVector3 lower_right = icon_position + (x_scale * 0.5f);
        LLVector3 upper_left = icon_position - (x_scale * 0.5f) + y_scale;
        LLVector3 upper_right = icon_position + (x_scale * 0.5f) + y_scale;

        if (for_select)
        {
                // set color to unique color id for picking
                LLColor4U coloru((U8)(mPickID >> 16), (U8)(mPickID >> 8), (U8)mPickID);
                glColor4ubv(coloru.mV);
        }
        else
        {
                LLColor4 icon_color = LLColor4::white;
                icon_color.mV[VALPHA] = alpha_factor;
                glColor4fv(icon_color.mV);
                LLViewerImage::bindTexture(mImagep);
        }

        glBegin(GL_QUADS);
        {
                glTexCoord2f(0.f, 1.f);
                glVertex3fv(upper_left.mV);
                glTexCoord2f(0.f, 0.f);
                glVertex3fv(lower_left.mV);
                glTexCoord2f(1.f, 0.f);
                glVertex3fv(lower_right.mV);
                glTexCoord2f(1.f, 1.f);
                glVertex3fv(upper_right.mV);
        }
        glEnd();
}

void LLHUDIcon::setImage(LLViewerImage* imagep)
{
        mImagep = imagep;
        mImagep->setClamp(TRUE, TRUE);
}

void LLHUDIcon::setScale(F32 fraction_of_fov)
{
        mScale = fraction_of_fov;
}

void LLHUDIcon::markDead()
{
        if (mSourceObject)
        {
                mSourceObject->clearIcon();
        }
        LLHUDObject::markDead();
}

void LLHUDIcon::render()
{
        renderIcon(FALSE);
}

void LLHUDIcon::renderForSelect()
{
        renderIcon(TRUE);
}


//static
S32 LLHUDIcon::generatePickIDs(S32 start_id, S32 step_size)
{
        S32 cur_id = start_id;
        icon_instance_t::iterator icon_it;

        for(icon_it = sIconInstances.begin(); icon_it != sIconInstances.end(); ++icon_it)
        {
                (*icon_it)->mPickID = cur_id;
                cur_id += step_size;
        }

        return cur_id;
}

//static
LLHUDIcon* LLHUDIcon::handlePick(S32 pick_id)
{
        icon_instance_t::iterator icon_it;

        for(icon_it = sIconInstances.begin(); icon_it != sIconInstances.end(); ++icon_it)
        {
                if (pick_id == (*icon_it)->mPickID)
                {
                        return *icon_it;
                }
        }

        return NULL;
}

 //static
void LLHUDIcon::updateAll()
{
        cleanupDeadIcons();
}

//static
BOOL LLHUDIcon::iconsNearby()
{
        return !sIconInstances.empty();
}

//static
void LLHUDIcon::cleanupDeadIcons()
{
        icon_instance_t::iterator icon_it;

        icon_instance_t icons_to_erase;
        for(icon_it = sIconInstances.begin(); icon_it != sIconInstances.end(); ++icon_it)
        {
                if ((*icon_it)->mDead)
                {
                        icons_to_erase.push_back(*icon_it);
                }
        }

        for(icon_it = icons_to_erase.begin(); icon_it != icons_to_erase.end(); ++icon_it)
        {
                icon_instance_t::iterator found_it = std::find(sIconInstances.begin(), sIconInstances.end(), *icon_it);
                if (found_it != sIconInstances.end())
                {
                        sIconInstances.erase(found_it);
                }
        }
}

//static
S32 LLHUDIcon::getNumInstances()
{
        return (S32)sIconInstances.size();
}

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