Method _render

RenderSystems/GL/src/OgreGLRenderSystem.cpp:2121–2267

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    }
    //---------------------------------------------------------------------
    void GLRenderSystem::_render(const RenderOperation& op)
    {
        // Call super class
        RenderSystem::_render(op);

        mMaxBuiltInTextureAttribIndex = 0;

        const VertexDeclaration::VertexElementList& decl =
            op.vertexData->vertexDeclaration->getElements();
        VertexDeclaration::VertexElementList::const_iterator elemIter, elemEnd;
        elemEnd = decl.end();

        for (elemIter = decl.begin(); elemIter != elemEnd; ++elemIter)
        {
            const VertexElement & elem = *elemIter;
            size_t source = elem.getSource();

            if (!op.vertexData->vertexBufferBinding->isBufferBound(source))
                continue; // skip unbound elements

            HardwareVertexBufferSharedPtr vertexBuffer =
                op.vertexData->vertexBufferBinding->getBuffer(source);

            bindVertexElementToGpu(elem, vertexBuffer, op.vertexData->vertexStart);
        }

        auto numberOfInstances = op.numberOfInstances;

        bool multitexturing = (getCapabilities()->getNumTextureUnits() > 1);
        if (multitexturing)
            glClientActiveTextureARB(GL_TEXTURE0);

        // Find the correct type to render
        GLint primType;
        switch (op.operationType)
        {
        case RenderOperation::OT_POINT_LIST:
            primType = GL_POINTS;
            break;
        case RenderOperation::OT_LINE_LIST:
            primType = GL_LINES;
            break;
        case RenderOperation::OT_LINE_LIST_ADJ:
            primType = GL_LINES_ADJACENCY_EXT;
            break;
        case RenderOperation::OT_LINE_STRIP:
            primType = GL_LINE_STRIP;
            break;
        case RenderOperation::OT_LINE_STRIP_ADJ:
            primType = GL_LINE_STRIP_ADJACENCY_EXT;
            break;
        default:
        case RenderOperation::OT_TRIANGLE_LIST:
            primType = GL_TRIANGLES;
            break;
        case RenderOperation::OT_TRIANGLE_LIST_ADJ:
            primType = GL_TRIANGLES_ADJACENCY_EXT;
            break;