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ALerpParticle.cpp

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/*
CS Senior Project 2003
Team : Leftfield
Project : ModernWarfare
Members :
- Russ Christensen              <rchriste@cs.utah.edu>
- Todd Smith                    <tcsmith@cs.utah.edu>
- Usit Duongsaa                 <duongsaa@cs.utah.edu>
Copyright 2003 Russ Christensen, Usit Duongsaa, and Todd Smith. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 
THIS SOFTWARE IS PROVIDED BY RUSS CHRISTENSEN, USIT DUONGSAA, AND TODD SMITH ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RUSS, USIT, TODD OR OTHER CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "AEngine.h"
#include "AState.h"
#include "AUtil.h"

const int MAX_LERP_COUNT = 4096;

//------------------------------------------------------------------------------------
void flare_init()
{
        int vbByteSize = MAX_LERP_COUNT * sizeof(LerpParticleVertex);
        if( FAILED( AS.pDevice->CreateVertexBuffer( vbByteSize, D3DUSAGE_WRITEONLY|D3DUSAGE_DYNAMIC|D3DUSAGE_POINTS,
                                                                        0, D3DPOOL_DEFAULT, &AS.flare_vb ) ))
                throw Error("Can't create flareVB");

        AS.flare_startRenderingIndex = 0;
        AS.flare_renderCount = 0;

        AS.vshader_lerpParticle = util_loadVertexShader( "shaders\\lerpParticle.vso", dwLerpParticleVertexDecl );
        AS.pshader_lerpParticle = util_loadPixelShader(  "shaders\\lerpParticle.pso" );
}
//------------------------------------------------------------------------------------
void flare_process()
{
        if( AS.flare_renderCount==0 ) return;   
        device_setVertexShader( AS.vshader_lerpParticle );
        device_setPixelShader(  AS.pshader_lerpParticle );      
        device_setTexture( 3, AS.res_textures[ AS.flare_texture ] );
        device_setStreamSource( 0, AS.flare_vb, sizeof(LerpParticleVertex) );

        Matx matx;
        FLOAT sizeCalcConst[4] = { 3.0f, 640.0f, 0.0f, 0.0f };
        D3DXMatrixTranspose( &matx, &AS.camera_world2projMatrix);
        AS.pDevice->SetVertexShaderConstant( 0, &matx, 4 );                     // world->proj matrix
        AS.pDevice->SetVertexShaderConstant( 4, &AS.camera_pos[0], 1 );         // camera pos
        AS.pDevice->SetVertexShaderConstant( 5, &sizeCalcConst, 1 );            // constants

        device_setRenderStateBlendMode( BlendModes::ADD );      

        device_setRenderState( D3DRS_ZWRITEENABLE, FALSE );
        device_setRenderState( D3DRS_ZENABLE, FALSE );
        device_setRenderState( D3DRS_POINTSPRITEENABLE, TRUE );
        device_setTextureStageState( 3, D3DTSS_MAGFILTER, D3DTEXF_LINEAR );
        device_setTextureStageState( 3, D3DTSS_MINFILTER, D3DTEXF_LINEAR );
        device_setTextureStageState( 3, D3DTSS_MIPFILTER, D3DTEXF_POINT );
                
        AS.pDevice->DrawPrimitive( D3DPT_POINTLIST, AS.flare_startRenderingIndex, AS.flare_renderCount );       

        device_setRenderState( D3DRS_POINTSPRITEENABLE, FALSE );
        AS.flare_startRenderingIndex += AS.flare_renderCount;
        AS.flare_renderCount = 0;
}
//------------------------------------------------------------------------------------
void flare_begin( ATexture texture, int maxParticles )
{
        assert(maxParticles>=0 && maxParticles<MAX_LERP_COUNT); 

        // check if there's enough space in current VB
        HRESULT res;
        if( AS.flare_startRenderingIndex + maxParticles < MAX_LERP_COUNT )
        {
                res = AS.flare_vb->Lock( AS.flare_startRenderingIndex*sizeof(LerpParticleVertex),
                                                                 maxParticles*sizeof(LerpParticleVertex),
                                                                 (BYTE**)&AS.flare_pVertex, D3DLOCK_NOOVERWRITE );
        if( FAILED(res)) throw Error("Can't Lock flareVB");
        }
        else                    // renew VB
        {
                AS.flare_startRenderingIndex = 0;
                res = AS.flare_vb->Lock( AS.flare_startRenderingIndex*sizeof(LerpParticleVertex),
                                                                 maxParticles*sizeof(LerpParticleVertex),
                                                                 (BYTE**)&AS.flare_pVertex, D3DLOCK_DISCARD );
        if( FAILED(res)) throw Error("Can't Lock/Renew flareVB");
        }

        AS.flare_reservedCount= maxParticles;
        AS.flare_renderCount = 0;
        AS.flare_texture = texture;
}
//------------------------------------------------------------------------------------
void flare_addParticle( const Vec3D &pos1, const Vec3D &pos2, const Vec4D multiplier,
                                                FLOAT dist, FLOAT size )
{
        if(AS.flare_renderCount >= AS.flare_reservedCount ) return;     // no more than you reserved    
        int index = AS.flare_renderCount;
        AS.flare_pVertex[index].pos1 = pos1;
        AS.flare_pVertex[index].pos2 = pos2;
        AS.flare_pVertex[index].colorMultiplier = multiplier;
        AS.flare_pVertex[index].dist = dist;    
        AS.flare_pVertex[index].size = size;
        AS.flare_renderCount++;
}
//------------------------------------------------------------------------------------
void flare_end()
{
        AS.flare_vb->Unlock();
}
//------------------------------------------------------------------------------------

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