source: trunk/src/gui/gui_gfx_renderer.cc @ 444

// Copyright (C) 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/gui/gui_gfx_renderer.hh"

#include "nv/interface/device.hh"
#include "nv/interface/context.hh"
#include "nv/core/logging.hh"

static const char *nv_gui_vertex_shader = R"(
#version 120
attribute vec2 nv_position;
attribute vec2 nv_texcoord;
attribute vec4 nv_color;
varying vec4 v_color;
varying vec2 v_texcoord;
uniform mat4 nv_m_projection;
void main(void)
{
        gl_Position = nv_m_projection * vec4(nv_position.x, nv_position.y, 0.0, 1.0);
        v_texcoord  = nv_texcoord;
        v_color     = nv_color;
}
)";

static const char *nv_gui_fragment_shader = R"(
#version 120
varying vec4 v_color;
varying vec2 v_texcoord;
uniform sampler2D nv_t_diffuse;
void main(void)
{
        vec4 tex_color = texture2D( nv_t_diffuse, v_texcoord );
        gl_FragColor   = v_color * tex_color;
}
)";


using namespace nv;
using namespace nv::gui;

struct vertex
{
        ivec2 position;
        vec2  texcoord;
        vec4  color;
        vertex() {}
        vertex( const nv::ivec2& cr, const nv::vec2& tc, const nv::vec4& c )
                : position( cr ), texcoord( tc ), color( c )
        {
        }
};

const ivec2 atlas_size = ivec2( 1024, 1024 );

struct gui_quad
{
        vertex vtx[6];
        gui_quad( const nv::ivec2& coorda, const nv::ivec2& coordb, const nv::vec4& color )
        {
                set_color( color );
                vtx[0].position = coorda;
                vtx[1].position = nv::ivec2( coorda.x, coordb.y );
                vtx[2].position = coordb;
                vtx[3].position = coordb;
                vtx[4].position = nv::ivec2( coordb.x, coorda.y );
                vtx[5].position = coorda;
        }
        gui_quad( const nv::ivec2& coorda, const nv::ivec2& coordb, const nv::vec4& color, const nv::vec2& tcoorda, const nv::vec2& tcoordb )
        {
                set_color( color );
                vtx[0].position = coorda;
                vtx[1].position = nv::ivec2( coorda.x, coordb.y );
                vtx[2].position = coordb;
                vtx[3].position = coordb;
                vtx[4].position = nv::ivec2( coordb.x, coorda.y );
                vtx[5].position = coorda;
                vtx[0].texcoord = tcoorda;
                vtx[1].texcoord = nv::vec2( tcoorda.x, tcoordb.y );
                vtx[2].texcoord = tcoordb;
                vtx[3].texcoord = tcoordb;
                vtx[4].texcoord = nv::vec2( tcoordb.x, tcoorda.y );
                vtx[5].texcoord = tcoorda;
        }
        gui_quad( const nv::ivec2& coorda, const nv::ivec2& coordb, const nv::ivec2& coordc, const nv::ivec2& coordd, const nv::vec4& color )
        {
                set_color( color );
                vtx[0].position = coorda;
                vtx[1].position = coordb;
                vtx[2].position = coordc;
                vtx[3].position = coordc;
                vtx[4].position = coordd;
                vtx[5].position = coorda;
        }
        inline void set_color( const nv::vec4& color )
        {
                vtx[0].color = color; vtx[1].color = color;     vtx[2].color = color;
                vtx[3].color = color; vtx[4].color = color;     vtx[5].color = color;
        }
};


class screen_render_data : public render_data
{
public:
        screen_render_data( context* actx, nv::size_t initial_size )
                : buffer( actx, VERTEX_BUFFER, DYNAMIC_DRAW, initial_size ), ctx( actx ), varray(), shader()
        {

        }
        ~screen_render_data()
        {
                ctx->get_device()->release( shader );
                ctx->release( varray );
        }

        nv::sliced_buffer<gui_quad> buffer;
        nv::context*      ctx;
        nv::texture       tex;
        nv::vertex_array  varray;
        nv::program       shader;
};

class element_render_data : public render_data
{
public:
        element_render_data( nv::sliced_buffer<gui_quad>* cbuffer )
                : buffer( cbuffer )
        {
        }

        nv::buffer_slice< gui_quad > buffer;
};

gfx_renderer::gfx_renderer( window* w )
        : m_window( w )
        , m_atlas( atlas_size, 4 )
        , m_reupload( true )
{
        NV_LOG_TRACE( "Creating GUI renderer..." );
        m_context = w->get_context();
        m_area.dim( dimension( w->get_width(), w->get_height() ) );
        region white = m_atlas.get_region( ivec2( 3, 3 ) );
        size_t wsize = m_atlas.get_depth() * 4 * 4;
        uint8* wfill = new uint8[m_atlas.get_depth() * 4 * 4];
        raw_fill( wfill, wfill + wsize, 255 );
        white.pos = ivec2();
        m_atlas.set_region( white, wfill );
        delete[] wfill;

        NV_LOG_TRACE( "Creating render data..." );
        screen_render_data* sr = new screen_render_data( w->get_context(), 1024 );
        m_render_data = sr;
        sr->shader = m_window->get_device()->create_program( nv_gui_vertex_shader, nv_gui_fragment_shader );
        m_scene_state.get_camera().set_ortho( 0.0f, float( m_window->get_width() ), float( m_window->get_height() ), 0.0f );

        sr->varray = m_window->get_context()->create_vertex_array();
        buffer vb = sr->buffer.get_buffer();
        m_window->get_context()->add_vertex_buffers< vertex >( sr->varray, vb );

        nv::sampler sampler( nv::sampler::LINEAR, nv::sampler::CLAMP_TO_EDGE );
        sr->tex = m_window->get_device()->create_texture( m_atlas.get_size(), image_format( nv::RGBA, nv::UBYTE ), sampler, nullptr );

        m_render_state.depth_test.enabled = false;
        m_render_state.culling.enabled = false;
        m_render_state.blending.enabled = true;
        m_render_state.blending.src_rgb_factor = blending::SRC_ALPHA;
        m_render_state.blending.dst_rgb_factor = blending::ONE_MINUS_SRC_ALPHA;
        m_render_state.blending.src_alpha_factor = blending::SRC_ALPHA;
        m_render_state.blending.dst_alpha_factor = blending::ONE_MINUS_SRC_ALPHA;
        NV_LOG_TRACE( "GUI Renderer created" );
}

texture_font* gfx_renderer::get_font( nv::size_t name ) const
{
        if ( name >= m_fonts.size() ) return nullptr;
        return m_fonts[name];
}

const image_info* gfx_renderer::get_image( nv::size_t name ) const
{
        if ( name >= m_images.size() ) return nullptr;
        return &m_images[name];
}

nv::size_t gfx_renderer::load_font( const string_view& filename, nv::size_t size )
{
        string128 id( filename );
        id.append( size );
        auto i = m_font_names.find( id );
        if ( i != m_font_names.end() )
        {
                return i->second;
        }
        size_t result = m_fonts.size();
        texture_font* f = new texture_font( &m_atlas, filename.data(), static_cast<float>( size ) );
        f->load_glyphs( "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~ " );
        m_fonts.push_back( f );
        m_reupload = true;
        m_font_names[ id ] = result;
        return result;
}

nv::size_t gfx_renderer::load_image( const string_view& filename )
{
        auto i = m_image_names.find( filename );
        if ( i != m_image_names.end() )
        {
                return i->second;
        }
        size_t result = m_images.size();
        image_data* data = m_window->get_device()->create_image_data( filename );
        // TODO: Repitching
        assert( data->get_depth() == 4 );
        region r = m_atlas.get_region( data->get_size() );
        m_atlas.set_region( r, data->get_data() );
        m_images.emplace_back( vec2( r.pos ) / vec2( atlas_size ), vec2( r.size + r.pos ) / vec2( atlas_size ), r.size );
        delete data;
        m_reupload = true;
        m_image_names[filename] = result;
        return result;
}

void gfx_renderer::redraw( element* e, uint32 )
{
        screen_render_data* sr = reinterpret_cast< screen_render_data* >( m_render_data );
        if ( e->m_render_data == nullptr )
        {
                e->m_render_data = new element_render_data( &sr->buffer );
        }
        element_render_data* er = reinterpret_cast< element_render_data* >( e->m_render_data );
        size_t size_before = er->buffer.data().size();

        vector< gui_quad >& qvec = er->buffer.lock();

        qvec.clear();
        rectangle abs = e->m_absolute;
        if ( e->m_absolute != m_area )
        {
                int border = 0;
                vec4 color;
                string128 path;
                const char* stext[] = { "", "selected", "hover" };
                const char* selector = stext[border];
                if ( e->m_flags[HOVER] )    selector = stext[2];
                if ( e->m_flags[SELECTED] ) selector = stext[1];
                NV_LOG_INFO( "redraw" );

                if ( m_style.get( e, "skin", selector, path ) )
                {
                        size_t image_id = load_image( path );
                        const image_info* image = get_image( image_id );
                        if ( image )
                        {
                                color = vec4( 2, 2, 2, 1 );
                                ivec2 isize3 = image->size / 3;
                                ivec2 isize3x = ivec2( isize3.x, 0 );
                                ivec2 isize3y = ivec2( 0, isize3.y );
                                vec2 tsize = ( image->t2 - image->t1 );
                                vec2 tsize3 = ( image->t2 - image->t1 ) / 3.0f;
                                vec2 tsize32 = ( image->t2 - image->t1 ) * ( 2.0f / 3.0f );
                                vec2 tsizex = vec2( tsize.x, 0.0f );
                                //vec2 tsizey = vec2( 0.0f, tsize.y );
                                vec2 tsize3x = vec2( tsize3.x, 0.0f );
                                vec2 tsize3y = vec2( 0.0f, tsize3.y );
                                vec2 tsize3x2 = vec2( tsize32.x, 0.0f );
                                vec2 tsize3y2 = vec2( 0.0f, tsize32.y );

                                rectangle inner = abs.shrinked( isize3 );
                                qvec.emplace_back( abs.ul, inner.ul, color, image->t1, image->t1 + tsize3 );
                                qvec.emplace_back( abs.ul + isize3x, inner.ur(), color, image->t1 + tsize3x, image->t1 + tsize3x2 + tsize3y );
                                qvec.emplace_back( abs.ur() - isize3x, inner.ur() + isize3x, color, image->t1 + tsize3x2, image->t1 + tsizex + tsize3y );

                                qvec.emplace_back( abs.ul + isize3y, inner.ll(), color, image->t1 + tsize3y, image->t1 + tsize3y2 + tsize3x );
                                qvec.emplace_back( inner.ul, inner.lr, color, image->t1 + tsize3, image->t1 + tsize32 );
                                qvec.emplace_back( inner.ur(), inner.lr + isize3x, color, image->t1 + tsize3 + tsize3x, image->t1 + tsize32 + tsize3x );


                                qvec.emplace_back( abs.ll() - isize3y, inner.ll() + isize3y, color, image->t1 + tsize3y2, image->t1 + tsize3y2 + tsize3 );
                                qvec.emplace_back( inner.ll(), abs.lr - isize3x, color, image->t1 + tsize3y2 + tsize3x, image->t1 + tsize32 + tsize3y );
                                qvec.emplace_back( inner.lr, abs.lr, color, image->t1 + tsize32, image->t1 + tsize );


                                //                              qvec.emplace_back( abs.ul, abs.ll(), inner.ll(), inner.ul, color );
                                //                              qvec.emplace_back( inner.ur(), inner.lr, abs.lr, abs.ur(), color );
                                //                              qvec.emplace_back( inner.ll(), abs.ll(), abs.lr, inner.lr, color );
                                abs = inner;

                        }

                }
                else
                {

                        if ( m_style.get( e, "border", selector, border ) && m_style.get( e, "border_color", selector, color ) )
                        {
                                rectangle inner = abs.shrinked( border );
                                qvec.emplace_back( abs.ul, inner.ul, inner.ur(), abs.ur(), color );
                                qvec.emplace_back( abs.ul, abs.ll(), inner.ll(), inner.ul, color );
                                qvec.emplace_back( inner.ur(), inner.lr, abs.lr, abs.ur(), color );
                                qvec.emplace_back( inner.ll(), abs.ll(), abs.lr, inner.lr, color );
                                abs = inner;
                        }

                        if ( m_style.get( e, "background_color", selector, color ) )
                        {
                                qvec.emplace_back( abs.ul, abs.lr, color );
                        }
                }

                e->m_text;
                if ( !e->m_text.empty() )
                {
                        if ( m_style.get( e, "text_color", selector, color ) && m_style.get( e, "text_font", selector, path ) && m_style.get( e, "text_size", selector, border ) )
                        {
                                size_t font_id = load_font( path, size_t( border ) );
                                texture_font* font = get_font( font_id );
                                position p = abs.ul + position( 0, border );
                                for ( char c : e->m_text )
                                {
                                        const texture_glyph* g = font->get_glyph( static_cast<uint16>( c ) );
                                        if ( g )
                                        {
                                                position gp = position( g->offset.x, -g->offset.y );
                                                position p2 = p + g->size + gp;
                                                qvec.emplace_back( p + gp, p2, color, g->tl, g->br );
                                                p += g->advance;
                                        }
                                }
                        }
                }
        }

        if ( size_before != er->buffer.data().size() )
        {
                sr->buffer.reset();
        }
}

void gfx_renderer::on_hover_change( element* e )
{
        if ( e->m_flags[DIRTY_HOVER] )
        {
                NV_LOG_DEBUG( "on_hover_change" );
                e->m_flags[DIRTY] = true;
        }
}

void gfx_renderer::on_select_change( element* e )
{
        if ( e->m_flags[DIRTY_SELECT] )
        {
                NV_LOG_DEBUG( "on_select_change" );
                e->m_flags[DIRTY] = true;
        }
}


void gfx_renderer::draw( element* e )
{
        element_render_data* er = reinterpret_cast< element_render_data* >( e->m_render_data );
        er->buffer.commit();
}

void gfx_renderer::draw()
{
        screen_render_data* sr = reinterpret_cast< screen_render_data* >( m_render_data );

        if ( m_reupload )
        {
                m_context->update( sr->tex, m_atlas.get_data() );
                m_reupload = false;
        }

        if ( sr->buffer.commit() )
        {
                buffer vb = sr->buffer.get_buffer();
                m_context->replace_vertex_buffer( sr->varray, vb, false );
        }
        m_context->bind( sr->tex, TEX_DIFFUSE );
        m_context->draw( TRIANGLES, m_render_state, m_scene_state, sr->shader, sr->varray, sr->buffer.get_size() * 6 );
}

gfx_renderer::~gfx_renderer()
{
        for ( auto p : m_fonts )
        {
                delete p;
        }
        if ( m_render_data )
        {
                m_context->get_device()->release( reinterpret_cast< screen_render_data* >( m_render_data )->tex );
                delete m_render_data;
        }
}

void nv::gui::gfx_renderer::on_style_change( element* e )
{
        m_style.load_flags( e );
}