0ad/source/renderer/PlayerRenderer.cpp

/***************************************************************************************
	AUTHOR:			John M. Mena
	EMAIL:			JohnMMena@hotmail.com
	FILE:			CConsole.h
	CREATED:		1/23/05
	COMPLETED:		NULL

	DESCRIPTION:	Handles rendering all of the player objects.
					The structure was inherited from Rich Cross' Transparency Renderer.
****************************************************************************************/

#include "precompiled.h"

#include <algorithm>
#include "Renderer.h"
#include "PlayerRenderer.h"
#include "Model.h"
#include "Game.h"

#include "CConsole.h"

extern CConsole *g_Console;

CPlayerRenderer g_PlayerRenderer;


//TODO: Clean up code!


///////////////////////////////////////////////////////////////////////////////////////////////////
// SortObjectsByDist: sorting class used for back-to-front sort of transparent passes
struct SortObjectsByDist {
	typedef CPlayerRenderer::SObject SortObj;
	
	bool operator()(const SortObj& lhs,const SortObj& rhs) {
		return lhs.m_Dist>rhs.m_Dist? true : false;
	}
};

///////////////////////////////////////////////////////////////////////////////////////////////////
// Render: render all deferred passes; call Sort before using to ensure passes
// are drawn in correct order
void CPlayerRenderer::Render()
{
	if (m_Objects.size()==0) return;

	// switch on wireframe if we need it
	if (g_Renderer.m_ModelRenderMode==WIREFRAME) {
		glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
	} 

	//TODO: Possibly remove render states from the loop that don't need to be
	//      initialized for each model.  Also, possibly combine the loops.

	for (uint i=0;i<m_Objects.size();++i) {
		if (!0 || (m_Objects[i].m_Model->GetFlags() & 0)) {
			CModelRData* modeldata=(CModelRData*) m_Objects[i].m_Model->GetRenderData();

			// Get the models player ID
			PS_uint playerid = m_Objects[i].m_Model->GetPlayerID();

			// Get the player color
			const SPlayerColour& colour = g_Game->GetPlayer( playerid )->GetColour();
			float color[] = { colour.r, colour.g, colour.b, colour.a };

			// set up texture environment for base pass - modulate texture and primary color
			glActiveTexture(GL_TEXTURE0);
			glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
			glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);
			glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
			glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PRIMARY_COLOR);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);

			// Set the proper LOD bias
			glTexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS,  g_Renderer.m_Options.m_LodBias);

			// Render two passes: first, render the unit as normal. Second,
			// render it again but modulated with the player-colour, using
			// the alpha channel as a mask.
			//
			// Assume the alpha channel is 1-bit, so there's no need for blending.
			//
			// This probably ought to be done in a single pass on hardware that
			// supports register combiners / fragment programs / etc.

			glEnableClientState(GL_VERTEX_ARRAY);
			glEnableClientState(GL_TEXTURE_COORD_ARRAY);
			glEnableClientState(GL_COLOR_ARRAY);

			// Set the texture environment color the player color
			glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, color);

			glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE);
			glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_CONSTANT);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);

			glDisable(GL_ALPHA_TEST);

			// Render the model
			modeldata->RenderStreams(STREAM_POS|STREAM_COLOR|STREAM_UV0, true);
		}
	}


	// Render first pass
	//RenderObjectsStreams(STREAM_POS|STREAM_COLOR|STREAM_UV0);

	for (uint i=0;i<m_Objects.size();++i) {
		if (!0 || (m_Objects[i].m_Model->GetFlags() & 0)) {
			CModelRData* modeldata=(CModelRData*) m_Objects[i].m_Model->GetRenderData();

			// Get the models player ID
			PS_uint playerid = m_Objects[i].m_Model->GetPlayerID();

			// Get the player color
			const SPlayerColour& colour = g_Game->GetPlayer( playerid )->GetColour();
			float color[] = { colour.r, colour.g, colour.b, colour.a };

			// Set up second pass: first texture unit carries on doing texture*lighting,
			// but passes alpha through inverted; the second texture unit modulates
			// with the player colour.

			glActiveTexture(GL_TEXTURE0);

			glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE);
			glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_ONE_MINUS_SRC_ALPHA);

			glActiveTexture(GL_TEXTURE1);

			glEnable(GL_TEXTURE_2D);

			// t1 = t0 * playercolor
			glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
			glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);
			glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_PREVIOUS);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
			glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_CONSTANT);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);

			// Set the texture environment color the player color
			glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, color);

			// Continue passing through alpha from texture
			glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE);
			glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_PREVIOUS);
			glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);


			// Only render high-alpha parts
			glEnable(GL_ALPHA_TEST);
			glAlphaFunc(GL_GREATER,0.5f);

			// Render the model
			modeldata->RenderStreams(STREAM_POS|STREAM_COLOR|STREAM_UV0, true);
		}
	}

	// Render second pass
	//RenderObjectsStreams(STREAM_POS|STREAM_COLOR|STREAM_UV0);

	// Restore states
	glActiveTexture(GL_TEXTURE1);
	glDisable(GL_TEXTURE_2D);
	glDisable(GL_ALPHA_TEST);

	glActiveTexture(GL_TEXTURE0);

	// switch off client states
	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	glDisableClientState(GL_VERTEX_ARRAY);
	glDisableClientState(GL_COLOR_ARRAY);


	//TODO: Wireframe correctly for players
	//if (g_Renderer.m_ModelRenderMode==WIREFRAME) {
	//	// switch wireframe off again
	//	glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
	//} else if (g_Renderer.m_ModelRenderMode==EDGED_FACES) {
	//	// edged faces: need to make a second pass over the data:
	//	// first switch on wireframe
	//	glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);
	//	
	//	// setup some renderstate ..
	//	glDepthMask(0);
	//	g_Renderer.SetTexture(0,0);
	//	glColor4f(1,1,1,0.75f);
	//	glLineWidth(1.0f);

	//	glEnable(GL_BLEND);
	//	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);

	//	// .. and some client states
	//	glEnableClientState(GL_VERTEX_ARRAY);

	//	// render each model
	//	RenderObjectsStreams(STREAM_POS);

	//	// .. and switch off the client states
	//	glDisableClientState(GL_VERTEX_ARRAY);

	//	// .. and restore the renderstates
	//	glDisable(GL_BLEND);
	//	glDepthMask(1);

	//	// restore fill mode, and we're done
	//	glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
	//}
}

void CPlayerRenderer::Clear()
{
	// all transparent objects rendered; release them
	m_Objects.clear();
}

void CPlayerRenderer::Add(CModel* model)
{	
	// resize array, get last object in list
	m_Objects.resize(m_Objects.size()+1);
	
	SObject& obj=m_Objects.back();
	obj.m_Model=model;

	// build transform from object to camera space 
	CMatrix3D objToCam,invcam;
	g_Renderer.m_Camera.m_Orientation.GetInverse(objToCam);
	objToCam*=model->GetTransform();

	// resort model indices from back to front, according to camera position - and store
	// the returned sqrd distance to the centre of the nearest triangle
	CModelRData* modeldata=(CModelRData*) model->GetRenderData();
	obj.m_Dist=modeldata->BackToFrontIndexSort(objToCam);
}

//TODO: Correctly implement shadows for the players
//void CPlayerRenderer::RenderShadows()
//{
//	if (m_Objects.size()==0) return;
//
//	// switch on client states
//	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
//
//	glDepthMask(0);
//
//	glEnable(GL_BLEND);
//	glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
//
//	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
//	glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_REPLACE);
//	glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_PREVIOUS);
//	glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
//	glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE);
//	glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);
//	glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);
//
//	// Set the proper LOD bias
//	glTexEnvf(GL_TEXTURE_FILTER_CONTROL, GL_TEXTURE_LOD_BIAS, g_Renderer.m_Options.m_LodBias);
//
//	RenderObjectsStreams(STREAM_POS|STREAM_UV0,MODELFLAG_CASTSHADOWS);
//
//	glDepthMask(1);
//	glDisable(GL_BLEND);
//
//	// switch off client states
//	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
//}

///////////////////////////////////////////////////////////////////////////////////////////////
// RenderObjectsStreams: render given streams on all objects
//void CPlayerRenderer::RenderObjectsStreams(u32 streamflags,u32 mflags)
//{
//	for (uint i=0;i<m_Objects.size();++i) {
//		if (!mflags || (m_Objects[i].m_Model->GetFlags() & mflags)) {
//			CModelRData* modeldata=(CModelRData*) m_Objects[i].m_Model->GetRenderData();
//
//			// Get the models player ID
//			PS_uint playerid = m_Objects[i].m_Model->GetPlayerID();
//
//			// Get the player color
//			const SPlayerColour& colour = g_Game->GetPlayer( playerid )->GetColour();
//			float color[] = { colour.r, colour.g, colour.b, colour.a };
//
//			// Set the texture environment color the player color
//			glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, color);
//
//			// Render the model
//			modeldata->RenderStreams(streamflags, true);
//		}
//	}
//}