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ASprite.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_SPRITE_COUNT = 4096;

//------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------
class SpriteRequestEntryComparer                
{
public:
        bool operator()(const SpriteRenderRequestEntry &L, const SpriteRenderRequestEntry &R )
        {
                return L.tex*100+L.blendMode < R.tex*100+R.blendMode;
        }
};
//------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------
void sprite_init()
{
        int vbByteSize = MAX_SPRITE_COUNT * sizeof(SpriteVertex);
        if( FAILED( AS.pDevice->CreateVertexBuffer( vbByteSize, D3DUSAGE_WRITEONLY|D3DUSAGE_DYNAMIC|D3DUSAGE_POINTS,
                                                                        0, D3DPOOL_DEFAULT, &AS.sprite_vb ) ))
                throw Error("Can't create spriteVB");

        AS.sprite_renderList.resize(0);
        AS.sprite_startRenderingIndex = 0;

        AS.vshader_sprite = util_loadVertexShader( "shaders\\sprite.vso", dwSpriteVertexDecl );
        AS.pshader_sprite = util_loadPixelShader(  "shaders\\sprite.pso" );
}
//------------------------------------------------------------------------------------
void sprite_add( ATexture tex, int blendMode, Vec3D pos, Vec4D multiplier, FLOAT size )
{
        AS.sprite_renderList.push_back( SpriteRenderRequestEntry(tex,blendMode,pos,multiplier,size) );
}
//------------------------------------------------------------------------------------
void sprite_flush()
{
        AS.sprite_renderList.resize(0);
}
//------------------------------------------------------------------------------------
void sprite_process()
{
        int renderCount = (int) AS.sprite_renderList.size();
        if(renderCount==0) return;

        sort( AS.sprite_renderList.begin(), AS.sprite_renderList.end(), SpriteRequestEntryComparer() );
        
        SpriteVertex *pVertex;

        // check if there's enough space in current VB
        HRESULT res;
        if( AS.sprite_startRenderingIndex + renderCount < MAX_SPRITE_COUNT )
        {
                res = AS.sprite_vb->Lock( AS.sprite_startRenderingIndex*sizeof(SpriteVertex),
                                                                  renderCount*sizeof(SpriteVertex),
                                                                  (BYTE**)&pVertex, D3DLOCK_NOOVERWRITE );
        if( FAILED(res)) throw Error("Can't Lock spriteVB");
        }
        else                    // renew VB
        {
                AS.sprite_startRenderingIndex = 0;
                res = AS.sprite_vb->Lock( AS.sprite_startRenderingIndex*sizeof(SpriteVertex),
                                                                  renderCount*sizeof(SpriteVertex),
                                                                  (BYTE**)&pVertex, D3DLOCK_DISCARD );
        if( FAILED(res)) throw Error("Can't Lock/Renew spriteVB");
        }

        // copy content to VB
        for( int i=0; i<renderCount; i++ )
        {
                pVertex[i].pos                     = AS.sprite_renderList[i].pos;
                pVertex[i].colorMultiplier = AS.sprite_renderList[i].multiplier;
                pVertex[i].size                    = AS.sprite_renderList[i].size;
        }
        AS.sprite_vb->Unlock();

        // set rendering flags
        device_setVertexShader( AS.vshader_sprite );
        device_setPixelShader(  AS.pshader_sprite );
        device_setStreamSource( 0, AS.sprite_vb, sizeof(SpriteVertex) );

        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_setRenderState( D3DRS_ZENABLE, FALSE );
        device_setRenderState( D3DRS_ZWRITEENABLE, 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 );
        
        // render, one texture type at a time
        ATexture currentTex  = AS.sprite_renderList[0].tex;
        int currentBlend     = AS.sprite_renderList[0].blendMode;

        int start = 0;
        for( int i=0; i<renderCount; i++ )
        {
                ATexture newTex = AS.sprite_renderList[i].tex;
                int newBlend    = AS.sprite_renderList[i].blendMode;
                if( newTex!=currentTex || newBlend!=currentBlend )
                {                       
                        device_setTexture( 3, AS.res_textures[ currentTex ] );
                        device_setRenderStateBlendMode(currentBlend);

                        // render (start)..(i-1)
                        AS.pDevice->DrawPrimitive( D3DPT_POINTLIST, AS.sprite_startRenderingIndex+start, (i-1)-start+1 );
                        
                        start = i;
                        currentTex = newTex;
                        currentBlend = newBlend;
                }
        }

        // render last remaining set
        // render (start)..(renderCount-1)
        device_setTexture( 3, AS.res_textures[ currentTex ] );
        device_setRenderStateBlendMode(currentBlend);
        AS.pDevice->DrawPrimitive( D3DPT_POINTLIST, AS.sprite_startRenderingIndex+start, (renderCount-1)-start+1 );

        AS.sprite_startRenderingIndex += renderCount;
        device_setRenderState( D3DRS_POINTSPRITEENABLE, FALSE );
}
//------------------------------------------------------------------------------------

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