KX_BlenderRenderTools.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "GL/glew.h"

#include "RAS_IRenderTools.h"
#include "RAS_IRasterizer.h"
#include "RAS_LightObject.h"
#include "RAS_ICanvas.h"
#include "RAS_GLExtensionManager.h"

#include "KX_GameObject.h"
#include "KX_PolygonMaterial.h"
#include "KX_BlenderMaterial.h"
#include "KX_RayCast.h"
#include "KX_IPhysicsController.h"
#include "KX_Light.h"

#include "PHY_IPhysicsEnvironment.h"

#include "STR_String.h"

#include "GPU_draw.h"

#include "KX_BlenderGL.h" // for text printing
#include "KX_BlenderRenderTools.h"

unsigned int KX_BlenderRenderTools::m_numgllights;

KX_BlenderRenderTools::KX_BlenderRenderTools()
{
    glGetIntegerv(GL_MAX_LIGHTS, (GLint*) &m_numgllights);
    if (m_numgllights < 8)
        m_numgllights = 8;
}

KX_BlenderRenderTools::~KX_BlenderRenderTools()
{
}

void KX_BlenderRenderTools::BeginFrame(RAS_IRasterizer* rasty)
{
    m_clientobject = NULL;
    m_lastlightlayer = -1;
    m_lastauxinfo = NULL;
    m_lastlighting = true; /* force disable in DisableOpenGLLights() */
    DisableOpenGLLights();
}

void KX_BlenderRenderTools::EndFrame(RAS_IRasterizer* rasty)
{
}

/* ProcessLighting performs lighting on objects. the layer is a bitfield that
 * contains layer information. There are 20 'official' layers in blender. A
 * light is applied on an object only when they are in the same layer. OpenGL
 * has a maximum of 8 lights (simultaneous), so 20 * 8 lights are possible in
 * a scene. */

void KX_BlenderRenderTools::ProcessLighting(RAS_IRasterizer *rasty, bool uselights, const MT_Transform& viewmat)
{
    bool enable = false;
    int layer= -1;

    /* find the layer */
    if(uselights) {
        if(m_clientobject)
            layer = static_cast<KX_GameObject*>(m_clientobject)->GetLayer();
    }

    /* avoid state switching */
    if(m_lastlightlayer == layer && m_lastauxinfo == m_auxilaryClientInfo)
        return;

    m_lastlightlayer = layer;
    m_lastauxinfo = m_auxilaryClientInfo;

    /* enable/disable lights as needed */
    if(layer >= 0)
        enable = applyLights(layer, viewmat);

    if(enable)
        EnableOpenGLLights(rasty);
    else
        DisableOpenGLLights();
}

void KX_BlenderRenderTools::EnableOpenGLLights(RAS_IRasterizer *rasty)
{
    if(m_lastlighting == true)
        return;

    glEnable(GL_LIGHTING);
    glEnable(GL_COLOR_MATERIAL);

    glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
    glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE);
    glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, (rasty->GetCameraOrtho())? GL_FALSE: GL_TRUE);
    if (GLEW_EXT_separate_specular_color || GLEW_VERSION_1_2)
        glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
    
    m_lastlighting = true;
}

void KX_BlenderRenderTools::DisableOpenGLLights()
{
    if(m_lastlighting == false)
        return;

    glDisable(GL_LIGHTING);
    glDisable(GL_COLOR_MATERIAL);

    m_lastlighting = false;
}


void KX_BlenderRenderTools::SetClientObject(RAS_IRasterizer *rasty, void* obj)
{
    if (m_clientobject != obj)
    {
        bool ccw = (obj == NULL || !((KX_GameObject*)obj)->IsNegativeScaling());
        rasty->SetFrontFace(ccw);

        m_clientobject = obj;
    }
}

bool KX_BlenderRenderTools::RayHit(KX_ClientObjectInfo* client, KX_RayCast* result, void * const data)
{
    double* const oglmatrix = (double* const) data;
    MT_Point3 resultpoint(result->m_hitPoint);
    MT_Vector3 resultnormal(result->m_hitNormal);
    MT_Vector3 left(oglmatrix[0],oglmatrix[1],oglmatrix[2]);
    MT_Vector3 dir = -(left.cross(resultnormal)).safe_normalized();
    left = (dir.cross(resultnormal)).safe_normalized();
    // for the up vector, we take the 'resultnormal' returned by the physics
    
    double maat[16]={
            left[0],        left[1],        left[2], 0,
                dir[0],         dir[1],         dir[2], 0,
        resultnormal[0],resultnormal[1],resultnormal[2], 0,
                0,              0,              0, 1};
    glTranslated(resultpoint[0],resultpoint[1],resultpoint[2]);
    //glMultMatrixd(oglmatrix);
    glMultMatrixd(maat);
    return true;
}

void KX_BlenderRenderTools::applyTransform(RAS_IRasterizer* rasty,double* oglmatrix,int objectdrawmode )
{
    /* FIXME:
    blender: intern/moto/include/MT_Vector3.inl:42: MT_Vector3 operator/(const
    MT_Vector3&, double): Assertion `!MT_fuzzyZero(s)' failed. 
    
    Program received signal SIGABRT, Aborted. 
    [Switching to Thread 16384 (LWP 1519)] 
    0x40477571 in kill () from /lib/libc.so.6 
    (gdb) bt 
    #7  0x08334368 in MT_Vector3::normalized() const () 
    #8  0x0833e6ec in KX_BlenderRenderTools::applyTransform(RAS_IRasterizer*, double*, int) () 
    */

    if (objectdrawmode & RAS_IPolyMaterial::BILLBOARD_SCREENALIGNED ||
        objectdrawmode & RAS_IPolyMaterial::BILLBOARD_AXISALIGNED)
    {
        // rotate the billboard/halo
        //page 360/361 3D Game Engine Design, David Eberly for a discussion
        // on screen aligned and axis aligned billboards
        // assumed is that the preprocessor transformed all billboard polygons
        // so that their normal points into the positive x direction (1.0 , 0.0 , 0.0)
        // when new parenting for objects is done, this rotation
        // will be moved into the object
        
        MT_Point3 objpos (oglmatrix[12],oglmatrix[13],oglmatrix[14]);
        MT_Point3 campos = rasty->GetCameraPosition();
        MT_Vector3 dir = (campos - objpos).safe_normalized();
        MT_Vector3 up(0,0,1.0);

        KX_GameObject* gameobj = (KX_GameObject*)m_clientobject;
        // get scaling of halo object
        MT_Vector3  size = gameobj->GetSGNode()->GetLocalScale();
        
        bool screenaligned = (objectdrawmode & RAS_IPolyMaterial::BILLBOARD_SCREENALIGNED)!=0;//false; //either screen or axisaligned
        if (screenaligned)
        {
            up = (up - up.dot(dir) * dir).safe_normalized();
        } else
        {
            dir = (dir - up.dot(dir)*up).safe_normalized();
        }

        MT_Vector3 left = dir.normalized();
        dir = (left.cross(up)).normalized();

        // we have calculated the row vectors, now we keep
        // local scaling into account:

        left *= size[0];
        dir  *= size[1];
        up   *= size[2];
        double maat[16]={
            left[0], left[1],left[2], 0,
                dir[0], dir[1],dir[2],0,
                up[0],up[1],up[2],0,
                0,0,0,1};
            glTranslated(objpos[0],objpos[1],objpos[2]);
            glMultMatrixd(maat);
            
    } else
    {
        if (objectdrawmode & RAS_IPolyMaterial::SHADOW)
        {
            // shadow must be cast to the ground, physics system needed here!
            MT_Point3 frompoint(oglmatrix[12],oglmatrix[13],oglmatrix[14]);
            KX_GameObject *gameobj = (KX_GameObject*)m_clientobject;
            MT_Vector3 direction = MT_Vector3(0,0,-1);

            direction.normalize();
            direction *= 100000;

            MT_Point3 topoint = frompoint + direction;

            KX_Scene* kxscene = (KX_Scene*) m_auxilaryClientInfo;
            PHY_IPhysicsEnvironment* physics_environment = kxscene->GetPhysicsEnvironment();
            KX_IPhysicsController* physics_controller = gameobj->GetPhysicsController();
            
            KX_GameObject *parent = gameobj->GetParent();
            if (!physics_controller && parent)
                physics_controller = parent->GetPhysicsController();
            if (parent)
                parent->Release();
                
            KX_RayCast::Callback<KX_BlenderRenderTools> callback(this, physics_controller, oglmatrix);
            if (!KX_RayCast::RayTest(physics_environment, frompoint, topoint, callback))
            {
                // couldn't find something to cast the shadow on...
                glMultMatrixd(oglmatrix);
            }
            else
            { // we found the "ground", but the cast matrix doesn't take
              // scaling in consideration, so we must apply the object scale
                MT_Vector3  size = gameobj->GetSGNode()->GetLocalScale();
                glScalef(size[0], size[1], size[2]);
            }
        } else
        {

            // 'normal' object
            glMultMatrixd(oglmatrix);
        }
    }
}
void KX_BlenderRenderTools::RenderText3D(int fontid,
                                         const char* text,
                                         int size,
                                         int dpi,
                                         float* color,
                                         double* mat,
                                         float aspect)
{
    BL_print_game_line(fontid, text, size, dpi, color, mat, aspect);
}

void KX_BlenderRenderTools::RenderText2D(RAS_TEXT_RENDER_MODE mode,
                                         const char* text,
                                         int xco,
                                         int yco,                                    
                                         int width,
                                         int height)
{
    if(mode == RAS_IRenderTools::RAS_TEXT_PADDED)
        BL_print_gamedebug_line_padded(text, xco, yco, width, height);
    else
        BL_print_gamedebug_line(text, xco, yco, width, height);
}

/* Render Text renders text into a (series of) polygon, using a texture font,
 * Each character consists of one polygon (one quad or two triangles) */

void KX_BlenderRenderTools::RenderText(
    int mode,
    RAS_IPolyMaterial* polymat,
    float v1[3], float v2[3], float v3[3], float v4[3], int glattrib)
{
    const STR_String& mytext = ((CValue*)m_clientobject)->GetPropertyText("Text");
    
    const unsigned int flag = polymat->GetFlag();
    struct MTFace* tface = 0;
    unsigned int *col = 0;

    if(flag & RAS_BLENDERMAT) {
        KX_BlenderMaterial *bl_mat = static_cast<KX_BlenderMaterial*>(polymat);
        tface = bl_mat->GetMTFace();
        col = bl_mat->GetMCol();
    } else {
        KX_PolygonMaterial* blenderpoly = static_cast<KX_PolygonMaterial*>(polymat);
        tface = blenderpoly->GetMTFace();
        col = blenderpoly->GetMCol();
    }
    
    GPU_render_text(tface, mode, mytext, mytext.Length(), col, v1, v2, v3, v4, glattrib);
}


void KX_BlenderRenderTools::PushMatrix()
{
    glPushMatrix();
}

void KX_BlenderRenderTools::PopMatrix()
{
    glPopMatrix();
}


int KX_BlenderRenderTools::applyLights(int objectlayer, const MT_Transform& viewmat)
{
    // taken from blender source, incompatibility between Blender Object / GameObject   
    KX_Scene* kxscene = (KX_Scene*)m_auxilaryClientInfo;
    float glviewmat[16];
    unsigned int count;
    std::vector<struct  RAS_LightObject*>::iterator lit = m_lights.begin();

    for(count=0; count<m_numgllights; count++)
        glDisable((GLenum)(GL_LIGHT0+count));

    viewmat.getValue(glviewmat);
    
    glPushMatrix();
    glLoadMatrixf(glviewmat);
    for (lit = m_lights.begin(), count = 0; !(lit==m_lights.end()) && count < m_numgllights; ++lit)
    {
        RAS_LightObject* lightdata = (*lit);
        KX_LightObject *kxlight = (KX_LightObject*)lightdata->m_light;

        if(kxlight->ApplyLight(kxscene, objectlayer, count))
            count++;
    }
    glPopMatrix();

    return count;
}

void KX_BlenderRenderTools::MotionBlur(RAS_IRasterizer* rasterizer)
{
    int state = rasterizer->GetMotionBlurState();
    float motionblurvalue;
    if(state)
    {
        motionblurvalue = rasterizer->GetMotionBlurValue();
        if(state==1)
        {
            //bugfix:load color buffer into accum buffer for the first time(state=1)
            glAccum(GL_LOAD, 1.0);
            rasterizer->SetMotionBlurState(2);
        }
        else if(motionblurvalue>=0.0 && motionblurvalue<=1.0)
        {
            glAccum(GL_MULT, motionblurvalue);
            glAccum(GL_ACCUM, 1-motionblurvalue);
            glAccum(GL_RETURN, 1.0);
            glFlush();
        }
    }
}