source: trunk/src/gl/gl_device.cc @ 473

// Copyright (C) 2012-2015 ChaosForge Ltd
// http://chaosforge.org/
//
// This file is part of Nova libraries. 
// For conditions of distribution and use, see copying.txt file in root folder.

#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.append( "#version 330\n" );
        for ( auto& i : get_uniform_factory() ) 
                m_shader_header.append( "uniform "+datatype_to_glsl_type( i.second->get_datatype() )+" "+ i.first +";\n" );
        for ( auto& i : get_link_uniform_factory() ) 
                m_shader_header.append( "uniform sampler2D "+i.first +";\n" );
}

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

        info->m_attribute_map   = new attribute_map;
        info->m_engine_uniforms = new engine_uniform_list;
        info->m_uniform_map     = new uniform_map;

        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( string_view filename )
{
        load_sdl_image_library();
        SDL_Surface* image = IMG_Load( filename.data() );
        if (!image)
        {
                NV_LOG_ERROR( "Image file ", filename, " not found!" );
                return nullptr;
        }
        // TODO: BGR vs RGB, single channel
        pixel_format pformat = RGBA;
        switch ( image->format->BytesPerPixel )
        {
        case 4: pformat = RGBA; break;
        case 3: pformat = RGB; break;
        case 1: pformat = RED; break;
        default: NV_ASSERT( false, "BytesPerPixel != 4,3 or 1!" );
        }
        image_format format( pformat, UBYTE );
        image_data* data = new image_data( format, ivec2( image->w, image->h ), static_cast<nv::uint8*>( image->pixels ) );
        return data;
}

// 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 uint8* data, uint32 size )
{
        load_sdl_image_library();
        SDL_Surface* image = IMG_LoadTyped_RW( SDL_RWFromMem( const_cast<uint8*>( data ), int( size ) ), 1, "png" );
        if ( !image )
        {
                NV_LOG_ERROR( "Image binary data cannot be loaded found!" );
                return nullptr;
        }
        // TODO: BGR vs RGB, single channel
        NV_ASSERT( image->format->BytesPerPixel > 2, "bytes per pixel > 2!" );
        image_format format( image->format->BytesPerPixel == 3 ? RGB : RGBA, UBYTE );
        image_data* idata = new image_data( format, ivec2( image->w, image->h ), static_cast<nv::uint8*>( image->pixels ) );
        return idata;
}


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, const void* data /*= nullptr */ )
{
        NV_ASSERT_ALWAYS( type != TEXTURE_3D && type != TEXTURE_2D_ARRAY, "2D texture type expected!" );
        unsigned glid = 0;
        unsigned gl_type = texture_type_to_enum( type );

        bool is_depth = aformat.format == DEPTH16 || aformat.format == DEPTH24 || aformat.format == DEPTH32;

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

        if ( is_depth )
        {
                glTexParameteri( gl_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
                glTexParameteri( gl_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

                // This is to allow usage of shadow2DProj function in the shader
                glTexParameteri( gl_type, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE );
                glTexParameteri( gl_type, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL );
        }

// #define GL_TEXTURE_MAX_ANISOTROPY_EXT 0x84FE
// #define GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT 0x84FF
// 
//      float aniso = 0.0f;
//      glGetFloatv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &aniso );
//      NV_LOG_INFO( "Anisotropy at ", aniso, " (", int( aniso ), " ) " );
//      glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, aniso );

        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     = ivec3( size.x, size.y, 1 );
        info->glid     = glid;
        return result;
}

nv::texture nv::gl_device::create_texture( texture_type type, ivec3 size, image_format aformat, sampler asampler, const void* data /*= nullptr */ )
{
        NV_ASSERT_ALWAYS( type == TEXTURE_3D || type == TEXTURE_2D_ARRAY, "3D texture type expected!" );
        unsigned glid = 0;
        unsigned gl_type = texture_type_to_enum( type );

        bool is_depth = aformat.format == DEPTH16 || aformat.format == DEPTH24 || aformat.format == DEPTH32;

        glGenTextures( 1, &glid );
        glBindTexture( gl_type, glid );

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

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

        if ( is_depth )
        {
                glTexParameteri( gl_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
                glTexParameteri( gl_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

                // This is to allow usage of shadow2DProj function in the shader
                glTexParameteri( gl_type, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE );
                glTexParameteri( gl_type, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL );
        }

        //glTexStorage3D( GL_TEXTURE_2D_ARRAY, mipLevelCount, GL_RGBA8, width, height, layerCount );
        glTexImage3D( gl_type, 0, GLint( nv::image_format_to_internal_enum( aformat.format ) ), size.x, size.y, size.z, 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 );

                delete info->m_attribute_map;
                delete info->m_engine_uniforms;
                delete info->m_uniform_map;

                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_view& name, bool fatal /*= true */ ) const
{
        const gl_program_info* info = m_programs.get( p );
        {
                nv::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_CRITICAL( "gl_device : uniform '", name, "' not found in program!" );
                        NV_ABORT( "gl_device : uniform not found!" );
                }
        }
        return nullptr;
}

int nv::gl_device::get_attribute_location( program p, const string_view& 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_CRITICAL( "gl_device : attribute '", name, "' not found in program!" );
                        NV_ABORT( "gl_device : attribute not found!" );
                }
        }
        return -1;
}

int nv::gl_device::get_block_location( program p, const string_view& name, bool fatal /*= true */ ) const
{
        return -1;
}

bool nv::gl_device::compile( gl_program_info* p, string_view vertex_program, string_view 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_INFO( "Program #", p->glid, (status == GL_FALSE ? " failed to compile!" : " compiled successfully.") );

        if ( length > 0 )
        {
                NV_LOG_INFO( "Program #", p->glid, " log: ", string_view( buffer, size_t( length ) ) );
        }

        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_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 ( auto& i : *p->m_uniform_map )
        {
                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(), static_cast< uniform< enum_to_type< FLOAT >::type >*>( ubase )->get_value() ); break;
                        case INT            : glUniform1iv( uloc, ubase->get_length(), static_cast< uniform< enum_to_type< INT >::type >*>( ubase )->get_value() ); break;
                        case FLOAT_VECTOR_2 : glUniform2fv( uloc, ubase->get_length(), reinterpret_cast<const GLfloat*>( static_cast< uniform< enum_to_type< FLOAT_VECTOR_2 >::type >*>( ubase )->get_value())); break;
                        case FLOAT_VECTOR_3 : glUniform3fv( uloc, ubase->get_length(), reinterpret_cast<const GLfloat*>( static_cast< uniform< enum_to_type< FLOAT_VECTOR_3 >::type >*>( ubase )->get_value())); break;
                        case FLOAT_VECTOR_4 : glUniform4fv( uloc, ubase->get_length(), reinterpret_cast<const GLfloat*>( static_cast< uniform< enum_to_type< FLOAT_VECTOR_4 >::type >*>( ubase )->get_value())); break;
                        case INT_VECTOR_2   : glUniform2iv( uloc, ubase->get_length(), reinterpret_cast<const GLint*>( static_cast< uniform< enum_to_type< INT_VECTOR_2 >::type >*>( ubase )->get_value())); break;
                        case INT_VECTOR_3   : glUniform3iv( uloc, ubase->get_length(), reinterpret_cast<const GLint*>( static_cast< uniform< enum_to_type< INT_VECTOR_3 >::type >*>( ubase )->get_value())); break;
                        case INT_VECTOR_4   : glUniform4iv( uloc, ubase->get_length(), reinterpret_cast<const GLint*>( static_cast< uniform< enum_to_type< INT_VECTOR_4 >::type >*>( ubase )->get_value())); break;
                        case FLOAT_MATRIX_2 : glUniformMatrix2fv( uloc, ubase->get_length(), GL_FALSE, reinterpret_cast<const GLfloat*>( static_cast< uniform< enum_to_type< FLOAT_MATRIX_2 >::type >*>( ubase )->get_value())); break;
                        case FLOAT_MATRIX_3 : glUniformMatrix3fv( uloc, ubase->get_length(), GL_FALSE, reinterpret_cast<const GLfloat*>( static_cast< uniform< enum_to_type< FLOAT_MATRIX_3 >::type >*>( ubase )->get_value())); break;
                        case FLOAT_MATRIX_4 : glUniformMatrix4fv( uloc, ubase->get_length(), GL_FALSE, reinterpret_cast<const GLfloat*>( static_cast< 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_view name( name_buffer, size_t( attr_nlen ) );

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

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

                attribute& attr = (*p->m_attribute_map)[ 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;
        int bparams;
        glGetProgramiv( p->glid, GL_ACTIVE_UNIFORMS, &params );
        glGetProgramiv( p->glid, GL_ACTIVE_UNIFORM_BLOCKS, &bparams );

        for ( unsigned i = 0; i < unsigned( 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_view name( name_buffer, size_t( uni_nlen ) );

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

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

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

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

        for ( unsigned i = 0; i < unsigned( bparams ); ++i )
        {
                int uni_len;
                char name_buffer[128];

                glGetActiveUniformBlockName( p->glid, i, 128, &uni_len, name_buffer );
                NV_LOG_INFO( string_view( name_buffer, size_t( uni_len ) ) );
        }
}

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

        const char* pc = shader_code.data();
        int l = int( shader_code.length() );

        glShaderSource( glid, 1, &pc, &l );
        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_ERROR( "Shader #", glid, " error: ", string_view( buffer, size_t( length ) ) );
                }
                else
                {
                        NV_LOG_INFO( "Shader #", glid, " compiled successfully: ", string_view( buffer, size_t( length ) ) );
                }
        }
        else
        {
                NV_LOG_INFO( "Shader #", glid, " compiled successfully." );
        }
        return compile_ok != 0;

}