llsprite.cpp

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/* -*- c++ -*-
 *      Notes:
 *              PR - Should add a creator that can take a pointer rather than handle for streaming 
 *              object textures.
 *              PR - Need to add support for lit/non-lit conditions, set normals?
 */

#include "llviewerprecompiledheaders.h"

#include <llglheaders.h>

#include "llsprite.h"

#include "math.h"

#include "lldrawable.h"
#include "llface.h"
#include "llviewercamera.h"
#include "llviewerimagelist.h"

LLVector3 LLSprite::sCameraUp(0.0f,0.0f,1.0f);
LLVector3 LLSprite::sCameraRight(1.0f,0.0f,0.0f);
LLVector3 LLSprite::sCameraPosition(0.f, 0.f, 0.f);
LLVector3 LLSprite::sNormal(0.0f,0.0f,0.0f);

// Construction/Destruction

// A simple initialization
LLSprite::LLSprite(const LLUUID &image_uuid)
{
        mImageID = image_uuid;
        mImagep = NULL;

        setSize(1.0f, 1.0f);
        setPosition(LLVector3(0.0f, 0.0f, 0.0f));
        mTexMode = GL_REPLACE;
        mColor.setVec(0.5f, 0.5f, 0.5f, 1.0f);
        mFollow = TRUE;
        mUseCameraUp = TRUE;
}

LLSprite::LLSprite(const LLUUID &image_uuid, const F32 width, const F32 height, const BOOL b_usemipmap)
{
        mImageID = image_uuid;
        mImagep = NULL;

        setSize(width,height);
        setPosition(LLVector3(0.0f, 0.0f, 0.0f));
        mTexMode = GL_REPLACE;
        mColor.setVec(0.5f, 0.5f, 0.5f, 1.0f);
        mFollow = TRUE;
        mUseCameraUp = TRUE;
}

LLSprite::~LLSprite()
{
}

void LLSprite::updateFace(LLFace &face)
{
        LLViewerCamera &camera = *LLViewerCamera::getInstance();

        // First, figure out how many vertices/indices we need.
        U32 num_vertices, num_indices;
        U32 vertex_count = 0;
        
        // Get the total number of vertices and indices
        if (mFollow)
        {
                num_vertices = 4;
                num_indices = 6;
        }
        else
        {
                num_vertices = 4;
                num_indices = 12;
        }

        face.setSize(num_vertices, num_indices);
        
        if (mFollow) 
        {
                sCameraUp = camera.getUpAxis();
                sCameraRight = -camera.getLeftAxis();
                sCameraPosition = camera.getOrigin();
                sNormal = -camera.getAtAxis();
                if (mUseCameraUp)
                {
                        // these need to live here because the height/width may change between render calls
                        mScaledUp = sCameraUp;
                        mScaledRight = sCameraRight;

                        mScaledUp *= mHeightDiv2;
                        mScaledRight *= mWidthDiv2;

                        mA = mPosition + mScaledRight + mScaledUp;
                        mB = mPosition - mScaledRight + mScaledUp;
                        mC = mPosition - mScaledRight - mScaledUp;
                        mD = mPosition + mScaledRight - mScaledUp;
                }
                else
                {
                        // The up vector is perpendicular to the camera vector...
                        LLVector3 camera_vec = mPosition - sCameraPosition;
                        mScaledRight = camera_vec % LLVector3(0.f, 0.f, 1.f);
                        mScaledUp = -(camera_vec % mScaledRight);
                        mScaledUp.normVec();
                        mScaledRight.normVec();
                        mScaledUp *= mHeightDiv2;
                        mScaledRight *= mWidthDiv2;

                        mA = mPosition + mScaledRight + mScaledUp;
                        mB = mPosition - mScaledRight + mScaledUp;
                        mC = mPosition - mScaledRight - mScaledUp;
                        mD = mPosition + mScaledRight - mScaledUp;
                }
        }
        else
        {
                // this is equivalent to how it was done before. . . 
                // we need to establish a way to 
                // identify the orientation of a particular sprite rather than
                // just banging it in on the x,z plane if it's not following the camera.

                LLVector3 x_axis;
                LLVector3 y_axis;

                F32 dot = sNormal * LLVector3(0.f, 1.f, 0.f);
                if (dot == 1.f || dot == -1.f)
                {
                        x_axis.setVec(1.f, 0.f, 0.f);
                        y_axis.setVec(0.f, 1.f, 0.f);
                }
                else
                {
                        x_axis = sNormal % LLVector3(0.f, -1.f, 0.f);
                        x_axis.normVec();

                        y_axis = sNormal % x_axis;
                }

                LLQuaternion yaw_rot(mYaw, sNormal);

                // rotate axes by specified yaw
                x_axis = x_axis * yaw_rot;
                y_axis = y_axis * yaw_rot;

                // rescale axes by width and height of sprite
                x_axis = x_axis * mWidthDiv2;
                y_axis = y_axis *  mHeightDiv2;

                mA = -x_axis + y_axis;
                mB = x_axis + y_axis;
                mC = x_axis - y_axis;
                mD = -x_axis - y_axis;

                mA += mPosition;
                mB += mPosition;
                mC += mPosition;
                mD += mPosition;
        }

        face.setFaceColor(mColor);

        LLStrider<LLVector3> verticesp;
        LLStrider<LLVector3> normalsp;
        LLStrider<LLVector2> tex_coordsp;
        LLStrider<U16> indicesp;
        U16 index_offset;

        // Setup face
        if (face.mVertexBuffer.isNull())
        {       
                face.mVertexBuffer = new LLVertexBuffer(LLVertexBuffer::MAP_VERTEX | 
                                                                                                LLVertexBuffer::MAP_TEXCOORD,
                                                                                                GL_STREAM_DRAW_ARB);
                face.mVertexBuffer->allocateBuffer(4, 12, TRUE);
                face.setGeomIndex(0);
                face.setIndicesIndex(0);
        }
                
        index_offset = face.getGeometry(verticesp,normalsp,tex_coordsp, indicesp);

        *tex_coordsp = LLVector2(0.f, 0.f);
        *verticesp = mC;
        tex_coordsp++;
        verticesp++;
        vertex_count++;

        *tex_coordsp = LLVector2(0.f, 1.f);
        *verticesp = mB;
        tex_coordsp++;
        verticesp++;
        vertex_count++;

        *tex_coordsp = LLVector2(1.f, 1.f);
        *verticesp = mA;
        tex_coordsp++;
        verticesp++;
        vertex_count++;

        *tex_coordsp = LLVector2(1.f, 0.0f);
        *verticesp = mD;
        tex_coordsp++;
        verticesp++;
        vertex_count++;

        // Generate indices, since they're easy.
        // Just a series of quads.
        *indicesp++ = index_offset;
        *indicesp++ = 2 + index_offset;
        *indicesp++ = 1 + index_offset;

        *indicesp++ = index_offset;
        *indicesp++ = 3 + index_offset;
        *indicesp++ = 2 + index_offset;

        if (!mFollow)
        {
                *indicesp++ = 0 + index_offset;
                *indicesp++ = 1 + index_offset;
                *indicesp++ = 2 + index_offset;
                *indicesp++ = 0 + index_offset;
                *indicesp++ = 2 + index_offset;
                *indicesp++ = 3 + index_offset;
        }

        face.mVertexBuffer->setBuffer(0);
        face.mCenterAgent = mPosition;
}

void LLSprite::setPosition(const LLVector3 &position) 
{
        mPosition = position; 
}


void LLSprite::setPitch(const F32 pitch) 
{
        mPitch = pitch; 
}


void LLSprite::setSize(const F32 width, const F32 height) 
{
        mWidth = width; 
        mHeight = height;
        mWidthDiv2 = width/2.0f;
        mHeightDiv2 = height/2.0f;
}

void LLSprite::setYaw(F32 yaw) 
{
        mYaw = yaw; 
}

void LLSprite::setFollow(const BOOL follow)
{
        mFollow = follow; 
}

void LLSprite::setUseCameraUp(const BOOL use_up)
{
        mUseCameraUp = use_up; 
}

void LLSprite::setTexMode(const LLGLenum mode) 
{
        mTexMode = mode; 
}

void LLSprite::setColor(const LLColor4 &color)
{
        mColor = color; 
}

void LLSprite::setColor(const F32 r, const F32 g, const F32 b, const F32 a)
{
        mColor.setVec(r, g, b, a);
}

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