/** 
 * @file lldrawpool.cpp
 * @brief LLDrawPoolMaterials class implementation
 * @author Jonathan "Geenz" Goodman
 *
 * $LicenseInfo:firstyear=2002&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2013, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "lldrawpoolmaterials.h"
#include "llviewershadermgr.h"
#include "pipeline.h"
#include "llglcommonfunc.h"
#include "llvoavatar.h"
#include "llperfstats.h"

LLDrawPoolMaterials::LLDrawPoolMaterials()
:  LLRenderPass(LLDrawPool::POOL_MATERIALS)
{
	
}

void LLDrawPoolMaterials::prerender()
{
	mShaderLevel = LLViewerShaderMgr::instance()->getShaderLevel(LLViewerShaderMgr::SHADER_OBJECT); 
}

S32 LLDrawPoolMaterials::getNumDeferredPasses()
{
    // 12 render passes times 2 (one for each rigged and non rigged)
	return 12*2;
}

void LLDrawPoolMaterials::beginDeferredPass(S32 pass)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_MATERIAL;

    bool rigged = false;
    if (pass >= 12)
    { 
        rigged = true;
        pass -= 12;
    }
	U32 shader_idx[] = 
	{
		0, //LLRenderPass::PASS_MATERIAL,
		//1, //LLRenderPass::PASS_MATERIAL_ALPHA,
		2, //LLRenderPass::PASS_MATERIAL_ALPHA_MASK,
		3, //LLRenderPass::PASS_MATERIAL_ALPHA_GLOW,
		4, //LLRenderPass::PASS_SPECMAP,
		//5, //LLRenderPass::PASS_SPECMAP_BLEND,
		6, //LLRenderPass::PASS_SPECMAP_MASK,
		7, //LLRenderPass::PASS_SPECMAP_GLOW,
		8, //LLRenderPass::PASS_NORMMAP,
		//9, //LLRenderPass::PASS_NORMMAP_BLEND,
		10, //LLRenderPass::PASS_NORMMAP_MASK,
		11, //LLRenderPass::PASS_NORMMAP_GLOW,
		12, //LLRenderPass::PASS_NORMSPEC,
		//13, //LLRenderPass::PASS_NORMSPEC_BLEND,
		14, //LLRenderPass::PASS_NORMSPEC_MASK,
		15, //LLRenderPass::PASS_NORMSPEC_GLOW,
	};
	
    U32 idx = shader_idx[pass];
    
    if (LLPipeline::sUnderWaterRender)
    {
        mShader = &(gDeferredMaterialWaterProgram[idx]);
    }
    else
    {
        mShader = &(gDeferredMaterialProgram[idx]);
    }
    
    if (rigged)
    {
        llassert(mShader->mRiggedVariant != nullptr);
        mShader = mShader->mRiggedVariant;
    }

    gPipeline.bindDeferredShader(*mShader);
}

void LLDrawPoolMaterials::endDeferredPass(S32 pass)
{
	LL_PROFILE_ZONE_SCOPED_CATEGORY_MATERIAL;

	mShader->unbind();

	LLRenderPass::endRenderPass(pass);
}

void LLDrawPoolMaterials::renderDeferred(S32 pass)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_MATERIAL;
	static const U32 type_list[] = 
	{
		LLRenderPass::PASS_MATERIAL,
		//LLRenderPass::PASS_MATERIAL_ALPHA,
		LLRenderPass::PASS_MATERIAL_ALPHA_MASK,
		LLRenderPass::PASS_MATERIAL_ALPHA_EMISSIVE,
		LLRenderPass::PASS_SPECMAP,
		//LLRenderPass::PASS_SPECMAP_BLEND,
		LLRenderPass::PASS_SPECMAP_MASK,
		LLRenderPass::PASS_SPECMAP_EMISSIVE,
		LLRenderPass::PASS_NORMMAP,
		//LLRenderPass::PASS_NORMMAP_BLEND,
		LLRenderPass::PASS_NORMMAP_MASK,
		LLRenderPass::PASS_NORMMAP_EMISSIVE,
		LLRenderPass::PASS_NORMSPEC,
		//LLRenderPass::PASS_NORMSPEC_BLEND,
		LLRenderPass::PASS_NORMSPEC_MASK,
		LLRenderPass::PASS_NORMSPEC_EMISSIVE,
	};

    bool rigged = false;
    if (pass >= 12)
    {
        rigged = true;
        pass -= 12;
    }

	llassert(pass < sizeof(type_list)/sizeof(U32));

	U32 type = type_list[pass];
    if (rigged)
    {
        type += 1;
    }

	LLCullResult::drawinfo_iterator begin = gPipeline.beginRenderMap(type);
	LLCullResult::drawinfo_iterator end = gPipeline.endRenderMap(type);
	
    std::unique_ptr<LLPerfStats::RecordAttachmentTime> ratPtr{};
    F32 lastIntensity = 0.f;
    F32 lastFullbright = 0.f;
    F32 lastMinimumAlpha = 0.f;
    LLVector4 lastSpecular = LLVector4(0, 0, 0, 0);

    GLint intensity = mShader->getUniformLocation(LLShaderMgr::ENVIRONMENT_INTENSITY);
    GLint brightness = mShader->getUniformLocation(LLShaderMgr::EMISSIVE_BRIGHTNESS);
    GLint minAlpha = mShader->getUniformLocation(LLShaderMgr::MINIMUM_ALPHA);
    GLint specular = mShader->getUniformLocation(LLShaderMgr::SPECULAR_COLOR);

    GLint diffuseChannel = mShader->enableTexture(LLShaderMgr::DIFFUSE_MAP);
    GLint specChannel = mShader->enableTexture(LLShaderMgr::SPECULAR_MAP);
    GLint normChannel = mShader->enableTexture(LLShaderMgr::BUMP_MAP);

    LLTexture* lastNormalMap = nullptr;
    LLTexture* lastSpecMap = nullptr;
    LLTexture* lastDiffuse = nullptr;

    gGL.getTexUnit(diffuseChannel)->unbindFast(LLTexUnit::TT_TEXTURE);

    if (intensity > -1)
    {
        glUniform1f(intensity, lastIntensity);
    }

    if (brightness > -1)
    {
        glUniform1f(brightness, lastFullbright);
    }

    if (minAlpha > -1)
    {
        glUniform1f(minAlpha, lastMinimumAlpha);
    }

    if (specular > -1)
    {
        glUniform4fv(specular, 1, lastSpecular.mV);
    }

    LLVOAvatar* lastAvatar = nullptr;

	for (LLCullResult::drawinfo_iterator i = begin; i != end; )
	{
        LL_PROFILE_ZONE_NAMED_CATEGORY_MATERIAL("materials draw loop");
		LLDrawInfo& params = **i;
		
        LLCullResult::increment_iterator(i, end);

#if 0 // TODO SL-19656 figure out how to reenable trackAttachments()
        if(params.mFace)
        {
            LLViewerObject* vobj = (LLViewerObject *)params.mFace->getViewerObject();

            if( vobj && vobj->isAttachment() )
            {
                trackAttachments( vobj, params.mFace->isState(LLFace::RIGGED), &ratPtr );
            }
        }
#endif

        if (specular > -1 && params.mSpecColor != lastSpecular)
        {
            lastSpecular = params.mSpecColor;
            glUniform4fv(specular, 1, lastSpecular.mV);
        }

        if (intensity != -1 && lastIntensity != params.mEnvIntensity)
        {
            lastIntensity = params.mEnvIntensity;
            glUniform1f(intensity, lastIntensity);
        }
 
        if (minAlpha > -1 && lastMinimumAlpha != params.mAlphaMaskCutoff)
        {
            lastMinimumAlpha = params.mAlphaMaskCutoff;
            glUniform1f(minAlpha, lastMinimumAlpha);
        }

        F32 fullbright = params.mFullbright ? 1.f : 0.f;
        if (brightness > -1 && lastFullbright != fullbright)
        {
            lastFullbright = fullbright;
            glUniform1f(brightness, lastFullbright);
        }

        if (normChannel > -1 && params.mNormalMap != lastNormalMap)
        {
            lastNormalMap = params.mNormalMap;
            llassert(lastNormalMap);
            gGL.getTexUnit(normChannel)->bindFast(lastNormalMap);
        }

        if (specChannel > -1 && params.mSpecularMap != lastSpecMap)
        {
            lastSpecMap = params.mSpecularMap;
            llassert(lastSpecMap);
            gGL.getTexUnit(specChannel)->bindFast(lastSpecMap);
        }

        if (params.mTexture != lastDiffuse)
        {
            lastDiffuse = params.mTexture;
            if (lastDiffuse)
            {
                gGL.getTexUnit(diffuseChannel)->bindFast(lastDiffuse);
            }
            else
            {
                gGL.getTexUnit(diffuseChannel)->unbindFast(LLTexUnit::TT_TEXTURE);
            }
        }

        // upload matrix palette to shader
        if (rigged && params.mAvatar.notNull())
        {
            if (params.mAvatar != lastAvatar)
            {
                const LLVOAvatar::MatrixPaletteCache& mpc = params.mAvatar->updateSkinInfoMatrixPalette(params.mSkinInfo);
                U32 count = mpc.mMatrixPalette.size();

                if (count == 0)
                {
                    //skin info not loaded yet, don't render
                    return;
                }

                mShader->uniformMatrix3x4fv(LLViewerShaderMgr::AVATAR_MATRIX,
                    count,
                    FALSE,
                    (GLfloat*)&(mpc.mGLMp[0]));
            }
        }

        applyModelMatrix(params);

        bool tex_setup = false;

        //not batching textures or batch has only 1 texture -- might need a texture matrix
        if (params.mTextureMatrix)
        {
            gGL.getTexUnit(0)->activate();
            gGL.matrixMode(LLRender::MM_TEXTURE);

            gGL.loadMatrix((GLfloat*)params.mTextureMatrix->mMatrix);
            gPipeline.mTextureMatrixOps++;

            tex_setup = true;
        }

        /*if (params.mGroup)  // TOO LATE
        {
            params.mGroup->rebuildMesh();
        }*/

        params.mVertexBuffer->setBuffer();
        params.mVertexBuffer->drawRange(LLRender::TRIANGLES, params.mStart, params.mEnd, params.mCount, params.mOffset);

        if (tex_setup)
        {
            gGL.getTexUnit(0)->activate();
            gGL.loadIdentity();
            gGL.matrixMode(LLRender::MM_MODELVIEW);
        }
	}
}