source: trunk/src/gl/gl_device.cc @ 331

// Copyright (C) 2012-2014 ChaosForge Ltd
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#include "nv/gl/gl_device.hh"

#include "nv/gl/gl_window.hh"
#include "nv/core/logging.hh"
#include "nv/lib/sdl_image.hh"
#include "nv/gl/gl_enum.hh"
#include "nv/lib/gl.hh"

using namespace nv;

gl_device::gl_device()
{
        m_shader_header  = "#version 120\n";
        for ( auto& i : get_uniform_factory() ) 
                m_shader_header += "uniform "+datatype_to_glsl_type( i.second->get_datatype() )+" "+i.first+";\n";
        for ( auto& i : get_link_uniform_factory() ) 
                m_shader_header += "uniform sampler2D "+i.first+";\n";
}

program gl_device::create_program( const string& vs_source, const string& fs_source )
{
        program result = m_programs.create();
        gl_program_info* info = m_programs.get( result );

        info->glid = glCreateProgram();
        compile( info, vs_source, fs_source );
        prepare_program( result );
        return result;
}

// this is a temporary function that will be removed once we find a way to 
// pass binary file data around
image_data* gl_device::create_image_data( const std::string& filename )
{
        load_sdl_image_library();
        SDL_Surface* image = IMG_Load( filename.c_str() );
        if (!image)
        {
                NV_LOG( LOG_ERROR, "Image file " << filename.c_str() << " not found!" );
                return nullptr;
        }
        // TODO: BGR vs RGB, single channel
        assert( image->format->BytesPerPixel > 2 );
        image_format format(image->format->BytesPerPixel == 3 ? RGB : RGBA, UBYTE );
        image_data* data = new image_data( format, glm::ivec2( image->w, image->h ), (nv::uint8*)image->pixels );
        return data;
}


gl_device::~gl_device()
{
        while ( m_textures.size() > 0 )
                release( m_textures.get_handle(0) );
        while ( m_buffers.size() > 0 )
                release( m_buffers.get_handle(0) );
        while ( m_programs.size() > 0 )
                release( m_programs.get_handle(0) );
}

nv::texture nv::gl_device::create_texture( texture_type type, ivec2 size, image_format aformat, sampler asampler, void* data /*= nullptr */ )
{
        unsigned glid = 0;
        unsigned gl_type = texture_type_to_enum( type );
        glGenTextures( 1, &glid );

        glBindTexture( gl_type, glid );

        // Detect if mipmapping was requested
        if ( gl_type == GL_TEXTURE_2D && asampler.filter_min != sampler::LINEAR && asampler.filter_min != sampler::NEAREST )
        {
                // TODO: This should not be done if we use framebuffers!
                glTexParameteri( gl_type, GL_GENERATE_MIPMAP, GL_TRUE);
        }

        if ( asampler.filter_max != sampler::NEAREST )
        {
                asampler.filter_max = sampler::LINEAR;
        }

        glTexParameteri( gl_type, GL_TEXTURE_MIN_FILTER, (int)nv::sampler_filter_to_enum( asampler.filter_min ) );
        glTexParameteri( gl_type, GL_TEXTURE_MAG_FILTER, (int)nv::sampler_filter_to_enum( asampler.filter_max ) );
        glTexParameteri( gl_type, GL_TEXTURE_WRAP_S, (int)nv::sampler_wrap_to_enum( asampler.wrap_s) );
        glTexParameteri( gl_type, GL_TEXTURE_WRAP_T, (int)nv::sampler_wrap_to_enum( asampler.wrap_t) );

        glTexImage2D( gl_type, 0, (GLint)nv::image_format_to_internal_enum(aformat.format), size.x, size.y, 0, nv::image_format_to_enum(aformat.format), nv::datatype_to_gl_enum(aformat.type), data );

        glBindTexture( gl_type, 0 );

        texture result = m_textures.create();
        gl_texture_info* info = m_textures.get( result );
        info->type     = type;
        info->format   = aformat;
        info->tsampler = asampler;
        info->size     = size;
        info->glid     = glid;
        return result;
}

void nv::gl_device::release( texture t )
{
        gl_texture_info* info = m_textures.get( t );
        if ( info )
        {
                if ( info->glid != 0 )
                {
                        glDeleteTextures( 1, &(info->glid) );
                }
                m_textures.destroy( t );
        }
}

void nv::gl_device::release( buffer b )
{
        gl_buffer_info* info = m_buffers.get( b );
        if ( info )
        {
                if ( info->glid != 0 )
                {
                        glDeleteBuffers( 1, &(info->glid) );
                }
                m_buffers.destroy( b );
        }
}

const texture_info* nv::gl_device::get_texture_info( texture t ) const
{
        return m_textures.get( t );
}

nv::buffer nv::gl_device::create_buffer( buffer_type type, buffer_hint hint, size_t size, const void* source /*= nullptr */ )
{
        unsigned glid   = 0;
        unsigned glenum = buffer_type_to_enum( type );
        glGenBuffers( 1, &glid );

        glBindBuffer( glenum, glid );
        glBufferData( glenum, (GLsizeiptr)size, source, buffer_hint_to_enum( hint ) );
        glBindBuffer( glenum, 0 );

        buffer result = m_buffers.create();
        gl_buffer_info* info = m_buffers.get( result );
        info->type = type;
        info->hint = hint;
        info->size = size;
        info->glid = glid;
        return result;
}

const buffer_info* nv::gl_device::get_buffer_info( buffer t ) const
{
        return m_buffers.get( t );
}

void nv::gl_device::release( program p )
{
        gl_program_info* info = m_programs.get( p );
        if ( info )
        {
                for ( auto& i : info->m_uniform_map )
                        delete i.second;

                glDetachShader( info->glid, info->glidv );
                glDetachShader( info->glid, info->glidf );
                glDeleteShader( info->glidv );
                glDeleteShader( info->glidf );
                glDeleteProgram( info->glid );

                m_programs.destroy( p );
        }
}

void nv::gl_device::prepare_program( program p )
{
        gl_program_info* info = m_programs.get( p );
        if ( info )
        {
                auto& map  = get_uniform_factory();
                auto& lmap = get_link_uniform_factory();

                for ( auto& i : info->m_uniform_map )
                {
                        auto j = lmap.find( i.first );
                        if ( j != lmap.end() )
                        {
                                j->second->set( i.second );
                        }                       

                        auto k = map.find( i.first );
                        if ( k != map.end() )
                        {
                                info->m_engine_uniforms.push_back( k->second->create( i.second ) );
                        }                               
                }
        }
}

uniform_base* nv::gl_device::get_uniform( program p, const string& name, bool fatal /*= true */ ) const
{
        const gl_program_info* info = m_programs.get( p );
        {
                uniform_map::const_iterator i = info->m_uniform_map.find( name );
                if ( i != info->m_uniform_map.end() )
                {
                        return i->second;
                }
                if ( fatal )
                {
                        NV_LOG( LOG_ERROR, "Uniform '" << name << "' not found in program!" );
                        NV_THROW( runtime_error, ( "Uniform '"+name+"' not found!" ) );
                }
        }
        return nullptr;
}

int nv::gl_device::get_attribute_location( program p, const string& name, bool fatal /*= true */ ) const
{
        const gl_program_info* info = m_programs.get( p );
        if ( info )
        {
                attribute_map::const_iterator i = info->m_attribute_map.find( name );
                if ( i != info->m_attribute_map.end() )
                {
                        return i->second.location;
                }
                if ( fatal )
                {
                        NV_LOG( LOG_ERROR, "Attribute '" << name << "' not found in program!" );
                        NV_THROW( runtime_error, ( "Attribute '"+name+"' not found!" ) );
                }
        }
        return -1;
}

bool nv::gl_device::compile( gl_program_info* p, const string& vertex_program, const string& fragment_program )
{
        if (!compile( GL_VERTEX_SHADER,   vertex_program, p->glidv ))   { return false; }
        if (!compile( GL_FRAGMENT_SHADER, fragment_program, p->glidf )) { return false; }

        glBindAttribLocation( p->glid, static_cast<GLuint>( slot::POSITION   ), "nv_position"  );
        glBindAttribLocation( p->glid, static_cast<GLuint>( slot::TEXCOORD   ), "nv_texcoord"  );
        glBindAttribLocation( p->glid, static_cast<GLuint>( slot::NORMAL     ), "nv_normal"    );
        glBindAttribLocation( p->glid, static_cast<GLuint>( slot::COLOR      ), "nv_color"     );
        glBindAttribLocation( p->glid, static_cast<GLuint>( slot::TANGENT    ), "nv_tangent"   );
        glBindAttribLocation( p->glid, static_cast<GLuint>( slot::BONEINDEX  ), "nv_boneindex" );
        glBindAttribLocation( p->glid, static_cast<GLuint>( slot::BONEWEIGHT ), "nv_boneweight");

        glAttachShader( p->glid, p->glidf );
        glAttachShader( p->glid, p->glidv );
        glLinkProgram( p->glid );

        const uint32 buffer_size = 2048;
        char buffer[ buffer_size ] = { 0 };
        int length;
        int status;

        glGetProgramiv( p->glid, GL_LINK_STATUS, &status );
        glGetProgramInfoLog( p->glid, buffer_size, &length, buffer );

        NV_LOG( LOG_INFO, "Program #" << p->glid << (status == GL_FALSE ? " failed to compile!" : " compiled successfully.") );

        if ( length > 0 )
        {
                NV_LOG( LOG_INFO, "Program #" << p->glid << " log: " << buffer );
        }

        if ( status == GL_FALSE ) 
        {
                return false;
        }

        glValidateProgram( p->glid );
        glGetProgramiv( p->glid, GL_VALIDATE_STATUS, &status );

        if ( status == GL_FALSE )
        {
                glGetProgramInfoLog( p->glid, buffer_size, &length, buffer );
                NV_LOG( LOG_ERROR, "Program #" << p->glid << " validation error : " << buffer );
                return false;
        }
        load_attributes( p );
        load_uniforms( p );
        return true;
}

void nv::gl_device::update_uniforms( gl_program_info* p )
{
        for ( uniform_map::iterator i = p->m_uniform_map.begin();       i != p->m_uniform_map.end(); ++i ) 
        {
                uniform_base* ubase = i->second;
                if ( ubase->is_dirty() )
                {
                        int uloc = ubase->get_location();
                        switch( ubase->get_type() )
                        {
                        case FLOAT          : glUniform1fv( uloc, ubase->get_length(), ((uniform< enum_to_type< FLOAT >::type >*)( ubase ))->get_value() ); break;
                        case INT            : glUniform1iv( uloc, ubase->get_length(), ((uniform< enum_to_type< INT >::type >*)( ubase ))->get_value() ); break;
                        case FLOAT_VECTOR_2 : glUniform2fv( uloc, ubase->get_length(), (GLfloat*)((uniform< enum_to_type< FLOAT_VECTOR_2 >::type >*)( ubase ))->get_value()); break;
                        case FLOAT_VECTOR_3 : glUniform3fv( uloc, ubase->get_length(), (GLfloat*)((uniform< enum_to_type< FLOAT_VECTOR_3 >::type >*)( ubase ))->get_value()); break;
                        case FLOAT_VECTOR_4 : glUniform4fv( uloc, ubase->get_length(), (GLfloat*)((uniform< enum_to_type< FLOAT_VECTOR_4 >::type >*)( ubase ))->get_value()); break;
                        case INT_VECTOR_2   : glUniform2iv( uloc, ubase->get_length(), (GLint*)((uniform< enum_to_type< INT_VECTOR_2 >::type >*)( ubase ))->get_value()); break;
                        case INT_VECTOR_3   : glUniform3iv( uloc, ubase->get_length(), (GLint*)((uniform< enum_to_type< INT_VECTOR_3 >::type >*)( ubase ))->get_value()); break;
                        case INT_VECTOR_4   : glUniform4iv( uloc, ubase->get_length(), (GLint*)((uniform< enum_to_type< INT_VECTOR_4 >::type >*)( ubase ))->get_value()); break;
                        case FLOAT_MATRIX_2 : glUniformMatrix2fv( uloc, ubase->get_length(), GL_FALSE, (GLfloat*)((uniform< enum_to_type< FLOAT_MATRIX_2 >::type >*)( ubase ))->get_value()); break;
                        case FLOAT_MATRIX_3 : glUniformMatrix3fv( uloc, ubase->get_length(), GL_FALSE, (GLfloat*)((uniform< enum_to_type< FLOAT_MATRIX_3 >::type >*)( ubase ))->get_value()); break;
                        case FLOAT_MATRIX_4 : glUniformMatrix4fv( uloc, ubase->get_length(), GL_FALSE, (GLfloat*)((uniform< enum_to_type< FLOAT_MATRIX_4 >::type >*)( ubase ))->get_value()); break;
                        default : break; // error?
                        }
                        ubase->clean();
                }
        }
}

void nv::gl_device::load_attributes( gl_program_info* p )
{
        int params;
        glGetProgramiv( p->glid, GL_ACTIVE_ATTRIBUTES, &params );

        for ( unsigned i = 0; i < (unsigned)params; ++i )
        {
                int attr_nlen;
                int attr_len;
                unsigned attr_type;
                char name_buffer[128];

                glGetActiveAttrib( p->glid, i, 128, &attr_nlen, &attr_len, &attr_type, name_buffer );

                string name( name_buffer, size_t(attr_nlen) );

                // skip built-ins
                if ( name.substr(0,3) == "gl_" ) continue;

                int attr_loc = glGetAttribLocation( p->glid, name.c_str() );

                attribute& attr = p->m_attribute_map[ name ];
                attr.name     = name;
                attr.location = attr_loc;
                attr.type     = gl_enum_to_datatype( attr_type );
                attr.length   = attr_len;
        }
}

void nv::gl_device::load_uniforms( gl_program_info* p )
{
        int params;
        glGetProgramiv( p->glid, GL_ACTIVE_UNIFORMS, &params );

        for ( unsigned i = 0; i < size_t(params); ++i )
        {
                int uni_nlen;
                int uni_len;
                unsigned uni_type;
                char name_buffer[128];

                glGetActiveUniform( p->glid, i, 128, &uni_nlen, &uni_len, &uni_type, name_buffer );

                string name( name_buffer, size_t(uni_nlen) );

                // skip built-ins
                if ( name.substr(0,3) == "gl_" ) continue;

                int uni_loc = glGetUniformLocation( p->glid, name.c_str() );
                datatype utype = gl_enum_to_datatype( uni_type );

                // check for array
                string::size_type arrchar = name.find('[');
                if ( arrchar != string::npos )
                {
                        name = name.substr( 0, arrchar );
                }

                uniform_base* u = uniform_base::create( utype, name, uni_loc, uni_len );
                NV_ASSERT( u, "Unknown uniform type!" );
                p->m_uniform_map[ name ] = u;
        }
}

bool nv::gl_device::compile( uint32 sh_type, const std::string& shader_code, unsigned& glid )
{
        glid = glCreateShader( sh_type );

        const char* pc = shader_code.c_str();

        glShaderSource( glid,   1, &pc, 0 );
        glCompileShader( glid );

        const uint32 buffer_size = 1024;
        char buffer[ buffer_size ] = { 0 };
        int length;
        int compile_ok = GL_FALSE;
        glGetShaderiv(glid, GL_COMPILE_STATUS, &compile_ok);
        glGetShaderInfoLog( glid, buffer_size, &length, buffer );

        if ( length > 0 )
        {
                if ( compile_ok == 0 )
                {
                        NV_LOG( LOG_ERROR, "Shader #" << glid << " error: " << buffer );
                }
                else
                {
                        NV_LOG( LOG_INFO, "Shader #" << glid << " compiled successfully: " << buffer );
                }
        }
        else
        {
                NV_LOG( LOG_INFO, "Shader #" << glid << " compiled successfully." );
        }
        return compile_ok != 0;

}