0ad/source/renderer/PlayerRenderer.cpp

/**
 * =========================================================================
 * File        : PlayerRenderer.cpp
 * Project     : Pyrogenesis
 * Description : Implementation of player colour RenderModifiers.
 *
 * @author John M. Mena <JohnMMena@hotmail.com>
 * @author Nicolai Hähnle <nicolai@wildfiregames.com>
 * =========================================================================
 */

#include "precompiled.h"

#include "renderer/Renderer.h"
#include "renderer/PlayerRenderer.h"
#include "graphics/Model.h"

#include "ps/CLogger.h"

#define LOG_CATEGORY "graphics"


///////////////////////////////////////////////////////////////////////////////////////////////////
// FastPlayerColorRender

FastPlayerColorRender::FastPlayerColorRender()
{
	debug_assert(ogl_max_tex_units >= 3);
}

FastPlayerColorRender::~FastPlayerColorRender()
{
}

bool FastPlayerColorRender::IsAvailable()
{
	return (ogl_max_tex_units >= 3);
}

u32 FastPlayerColorRender::BeginPass(uint pass)
{
	debug_assert(pass == 0);
	
	// Nice player color uses a single pass with three texture environments
	// Note: This uses ARB_texture_env_crossbar (which is checked in GameSetup)
	//
	// We calculate: Result = Color*Texture*(PlayerColor*(1-Texture.a) + 1.0*Texture.a)
	// Algebra gives us:
	// Result = (1 - ((1 - PlayerColor) * (1 - Texture.a)))*Texture*Color
	
	// TexEnv #0
	pglActiveTextureARB(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_TEXTURE0);
	glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_ONE_MINUS_SRC_ALPHA);
	glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_CONSTANT);
	glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_ONE_MINUS_SRC_COLOR);
	
	// Don't care about alpha; set it to something harmless
	glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE);
	glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE0);
	glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_SRC_ALPHA);

	// TexEnv #1
	pglActiveTextureARB(GL_TEXTURE0+1);
	glEnable(GL_TEXTURE_2D);
	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_ONE_MINUS_SRC_COLOR);
	glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PRIMARY_COLOR);
	glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);

	// Don't care about alpha; set it to something harmless
	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);
	
	// TexEnv #2
	pglActiveTextureARB(GL_TEXTURE0+2);
	glEnable(GL_TEXTURE_2D);
	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_TEXTURE0);
	glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);

	// Don't care about alpha; set it to something harmless
	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);
	
	pglActiveTextureARB(GL_TEXTURE0);

	return STREAM_POS|STREAM_COLOR|STREAM_UV0;
}


bool FastPlayerColorRender::EndPass(uint UNUSED(pass))
{
	// Restore state
	pglActiveTextureARB(GL_TEXTURE1);
	glDisable(GL_TEXTURE_2D);
	pglActiveTextureARB(GL_TEXTURE2);
	glDisable(GL_TEXTURE_2D);
	pglActiveTextureARB(GL_TEXTURE0);
	
	return true;
}

void FastPlayerColorRender::PrepareTexture(uint UNUSED(pass), CTexture* texture)
{
	g_Renderer.SetTexture(2, texture);
	g_Renderer.SetTexture(1, texture);
	g_Renderer.SetTexture(0, texture);
}

void FastPlayerColorRender::PrepareModel(uint UNUSED(pass), CModel* model)
{
	// Get the player color
	SMaterialColor colour = model->GetMaterial().GetPlayerColor();
	float* color = &colour.r; // because it's stored RGBA

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


///////////////////////////////////////////////////////////////////////////////////////////////////
// SlowPlayerColorRender

SlowPlayerColorRender::SlowPlayerColorRender()
{
}

SlowPlayerColorRender::~SlowPlayerColorRender()
{
}

u32 SlowPlayerColorRender::BeginPass(uint pass)
{
	// We calculate: Result = (Color*Texture)*Texture.a + (Color*Texture*PlayerColor)*(1-Texture.a)
	// Modulation is done via texture environments, the final interpolation is done via blending
	
	if (pass == 0)
	{
		// TexEnv #0
		pglActiveTextureARB(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);
		
		// Don't care about alpha; set it to something harmless
		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);
		
		// Render it!
		return STREAM_POS|STREAM_COLOR|STREAM_UV0;
	}
	else
	{
		// TexEnv #0
		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_CONSTANT);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
		
		// Alpha = Opacity of non-player colored layer
		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);
		
		// TexEnv #1
		pglActiveTextureARB(GL_TEXTURE1);
		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_PRIMARY_COLOR);
		glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
	
		// Pass alpha unchanged
		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);
		pglActiveTextureARB(GL_TEXTURE0);
		
		// Setup blending
		glEnable(GL_BLEND);
		glBlendFunc(GL_ONE_MINUS_SRC_ALPHA, GL_SRC_ALPHA);
		glEnable(GL_ALPHA_TEST);
		glAlphaFunc(GL_LESS, 1.0);
		glDepthMask(0);
		
		// Render it!
		return STREAM_POS|STREAM_COLOR|STREAM_UV0;
	}
}

bool SlowPlayerColorRender::EndPass(uint pass)
{
	if (pass == 0)
		return false; // need two passes

	// Restore state
	pglActiveTextureARB(GL_TEXTURE1);
	glDisable(GL_TEXTURE_2D);
	pglActiveTextureARB(GL_TEXTURE0);
	glDisable(GL_BLEND);
	glDisable(GL_ALPHA_TEST);
	glDepthMask(1);
	
	return true;
}

void SlowPlayerColorRender::PrepareTexture(uint pass, CTexture* texture)
{
	if (pass == 1)
		g_Renderer.SetTexture(1, texture);
	g_Renderer.SetTexture(0, texture);
}


void SlowPlayerColorRender::PrepareModel(uint pass, CModel* model)
{
	if (pass == 1)
	{
		// Get the player color
		SMaterialColor colour = model->GetMaterial().GetPlayerColor();
		float* color = &colour.r; // because it's stored RGBA

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