BL_BlenderShader.cpp

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#include "DNA_customdata_types.h"
#include "DNA_material_types.h"
#include "DNA_scene_types.h"

#include "BKE_global.h"
#include "BKE_main.h"
#include "BKE_DerivedMesh.h"

#include "BL_BlenderShader.h"
#include "BL_Material.h"

#include "GPU_extensions.h"
#include "GPU_material.h"

#include "RAS_BucketManager.h"
#include "RAS_MeshObject.h"
#include "RAS_IRasterizer.h"
 
BL_BlenderShader::BL_BlenderShader(KX_Scene *scene, struct Material *ma, int lightlayer)
:
    mScene(scene),
    mMat(ma),
    mLightLayer(lightlayer),
    mGPUMat(NULL)
{
    mBlenderScene = scene->GetBlenderScene();
    mAlphaBlend = GPU_BLEND_SOLID;

    ReloadMaterial();
}

BL_BlenderShader::~BL_BlenderShader()
{
    if(mGPUMat)
        GPU_material_unbind(mGPUMat);
}

void BL_BlenderShader::ReloadMaterial()
{
    mGPUMat = (mMat) ? GPU_material_from_blender(mBlenderScene, mMat) : NULL;
}

void BL_BlenderShader::SetProg(bool enable, double time)
{
    if(VerifyShader()) {
        if(enable)
            GPU_material_bind(mGPUMat, mLightLayer, mBlenderScene->lay, time, 1);
        else
            GPU_material_unbind(mGPUMat);
    }
}

int BL_BlenderShader::GetAttribNum()
{
    GPUVertexAttribs attribs;
    int i, enabled = 0;

    if(!VerifyShader())
        return enabled;

    GPU_material_vertex_attributes(mGPUMat, &attribs);

    for(i = 0; i < attribs.totlayer; i++)
        if(attribs.layer[i].glindex+1 > enabled)
            enabled= attribs.layer[i].glindex+1;
    
    if(enabled > BL_MAX_ATTRIB)
        enabled = BL_MAX_ATTRIB;

    return enabled;
}

void BL_BlenderShader::SetAttribs(RAS_IRasterizer* ras, const BL_Material *mat)
{
    GPUVertexAttribs attribs;
    GPUMaterial *gpumat;
    int i, attrib_num;

    ras->SetAttribNum(0);

    if(!VerifyShader())
        return;
    
    gpumat = mGPUMat;

    if(ras->GetDrawingMode() == RAS_IRasterizer::KX_TEXTURED) {
        GPU_material_vertex_attributes(gpumat, &attribs);
        attrib_num = GetAttribNum();

        ras->SetTexCoordNum(0);
        ras->SetAttribNum(attrib_num);
        for(i=0; i<attrib_num; i++)
            ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_DISABLE, i);

        for(i = 0; i < attribs.totlayer; i++) {
            if(attribs.layer[i].glindex > attrib_num)
                continue;

            if(attribs.layer[i].type == CD_MTFACE) {
                if(!mat->uvName.IsEmpty() && strcmp(mat->uvName.ReadPtr(), attribs.layer[i].name) == 0)
                    ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_UV1, attribs.layer[i].glindex);
                else if(!mat->uv2Name.IsEmpty() && strcmp(mat->uv2Name.ReadPtr(), attribs.layer[i].name) == 0)
                    ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_UV2, attribs.layer[i].glindex);
                else
                    ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_UV1, attribs.layer[i].glindex);
            }
            else if(attribs.layer[i].type == CD_TANGENT)
                ras->SetAttrib(RAS_IRasterizer::RAS_TEXTANGENT, attribs.layer[i].glindex);
            else if(attribs.layer[i].type == CD_ORCO)
                ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_ORCO, attribs.layer[i].glindex);
            else if(attribs.layer[i].type == CD_NORMAL)
                ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_NORM, attribs.layer[i].glindex);
            else if(attribs.layer[i].type == CD_MCOL)
                ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_VCOL, attribs.layer[i].glindex);
            else
                ras->SetAttrib(RAS_IRasterizer::RAS_TEXCO_DISABLE, attribs.layer[i].glindex);
        }
    }
}

void BL_BlenderShader::Update(const RAS_MeshSlot & ms, RAS_IRasterizer* rasty )
{
    float obmat[4][4], viewmat[4][4], viewinvmat[4][4], obcol[4];
    GPUMaterial *gpumat;

    gpumat = mGPUMat;

    if(!gpumat || !GPU_material_bound(gpumat))
        return;

    MT_Matrix4x4 model;
    model.setValue(ms.m_OpenGLMatrix);
    const MT_Matrix4x4& view = rasty->GetViewMatrix();
    const MT_Matrix4x4& viewinv = rasty->GetViewInvMatrix();

    // note: getValue gives back column major as needed by OpenGL
    model.getValue((float*)obmat);
    view.getValue((float*)viewmat);
    viewinv.getValue((float*)viewinvmat);

    if(ms.m_bObjectColor)
        ms.m_RGBAcolor.getValue((float*)obcol);
    else
        obcol[0]= obcol[1]= obcol[2]= obcol[3]= 1.0f;

    float auto_bump_scale = ms.m_pDerivedMesh!=0 ? ms.m_pDerivedMesh->auto_bump_scale : 1.0f;
    GPU_material_bind_uniforms(gpumat, obmat, viewmat, viewinvmat, obcol, auto_bump_scale);

    mAlphaBlend = GPU_material_alpha_blend(gpumat, obcol);
}

int BL_BlenderShader::GetAlphaBlend()
{
    return mAlphaBlend;
}

bool BL_BlenderShader::Equals(BL_BlenderShader *blshader)
{
    /* to avoid unneeded state switches */
    return (blshader && mMat == blshader->mMat && mLightLayer == blshader->mLightLayer);
}

// eof