source: trunk/tests/cachebuf_test/nv_cachebuf_test.cc @ 106

#include <nv/interface/vertex_buffer.hh>
#include <nv/gl/gl_device.hh>
#include <nv/gfx/image.hh>
#include <nv/interface/context.hh>
#include <nv/interface/window.hh>
#include <nv/interface/program.hh>
#include <nv/interface/texture2d.hh>
#include <nv/logging.hh>
#include <nv/logger.hh>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <nv/string.hh>
#include <nv/types.hh>
#include <nv/interface/mesh.hh>
#include <cstdlib> // rand
#include <ctime> // time

#include <nv/gfx/cached_buffer.hh>

struct vertex
{
        nv::ivec2 coord;
        nv::vec4  color;
        vertex() {}
        vertex( const nv::ivec2& coord, const nv::vec4& color )
                : coord( coord ), color( color ) {}
};

struct quad
{
        vertex vtx[6];
        quad( const nv::ivec2& coorda, const nv::ivec2& coordb, 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;
                vtx[0].coord = coorda;
                vtx[1].coord = nv::ivec2( coorda.x, coordb.y );
                vtx[2].coord = coordb;
                vtx[3].coord = coordb;
                vtx[4].coord = nv::ivec2( coordb.x, coorda.y );
                vtx[5].coord = coorda;
        }
        quad( const nv::ivec2& coorda, const nv::ivec2& coordb, const nv::ivec2& coordc, const nv::ivec2& coordd, 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;
                vtx[0].coord = coorda;
                vtx[1].coord = coordb;
                vtx[2].coord = coordc;
                vtx[3].coord = coordc;
                vtx[4].coord = coordd;
                vtx[5].coord = coorda;
        }

};

struct app_window
{
        app_window( nv::cached_buffer<quad>* cache, const glm::ivec2& a, const glm::ivec2& b, const glm::vec4& color )
                : m_slice( cache )
        {
                glm::vec4 dcolor( color.x * 0.5, color.y * 0.5, color.z * 0.5, 1.0 );
                std::vector<quad>& v = m_slice.lock();
                nv::ivec2 a2( a.x, b.y );
                nv::ivec2 b2( b.x, a.y );
                nv::ivec2 t1( 10, 10 );
                nv::ivec2 t2( -10, 10 );
                v.emplace_back( a - t1, a,       b2, b2 - t2, dcolor );
                v.emplace_back( a - t1, a2 + t2, a2, a,       dcolor );
                v.emplace_back( a2 + t2, b + t1, b, a2, dcolor );
                v.emplace_back( b + t1, b2 - t2, b2, b, dcolor );
                v.emplace_back( a, b, color );
        }

        void change_color( const glm::vec4& color )
        {
                glm::vec4 dcolor( color.x * 0.5, color.y * 0.5, color.z * 0.5, 1.0 );
                std::vector<quad>& v = m_slice.lock();
                vertex* vtx = (vertex*)v.data();
                for (size_t i = 0; i < (v.size() - 1) * 6; ++i )
                        vtx[i].color = color;
                for (size_t i = (v.size() - 1) * 6; i < (v.size()) * 6; ++i )
                        vtx[i].color = dcolor;
        }

        void draw()
        {
                m_slice.commit();
        }

        nv::buffer_slice<quad> m_slice;
};

class application
{
public:
        application();
        bool initialize();
        bool run();
        void kill_window();
        void spawn_window();
        void recolor_window();
        ~application();
protected:
        nv::device* m_device;
        nv::window* m_window;
        nv::clear_state m_clear_state;
        nv::render_state m_render_state;
        
        nv::cached_buffer<quad>* m_quad_cache;
        std::vector<app_window>  m_windows;

        nv::program* m_program;
        nv::vertex_array* m_va;
        unsigned int m_count;
        int m_coord_loc;
        int m_color_loc;
};

application::application()
{
        m_device = new nv::gl_device();
        m_window = m_device->create_window( 800, 600 );

        m_clear_state.buffers = nv::clear_state::COLOR_AND_DEPTH_BUFFER;
        m_render_state.depth_test.enabled = false;
        m_render_state.culling.enabled    = false;
        m_render_state.blending.enabled   = false;
        m_render_state.blending.src_rgb_factor   = nv::blending::SRC_ALPHA;
        m_render_state.blending.dst_rgb_factor   = nv::blending::ONE_MINUS_SRC_ALPHA;
        m_render_state.blending.src_alpha_factor = nv::blending::SRC_ALPHA;
        m_render_state.blending.dst_alpha_factor = nv::blending::ONE_MINUS_SRC_ALPHA;
}

bool application::initialize()
{
        { 
                m_program = m_device->create_program( nv::slurp( "cachebuf.vert" ), nv::slurp( "cachebuf.frag" ) );
                m_va      = m_device->create_vertex_array();

                m_quad_cache = new nv::cached_buffer<quad>( m_device, nv::DYNAMIC_DRAW, 20, true );
                m_coord_loc  = m_program->get_attribute("coord")->get_location();
                m_color_loc  = m_program->get_attribute("color")->get_location();

                m_va->add_vertex_buffer( m_coord_loc, (nv::vertex_buffer*)m_quad_cache->get_buffer(), nv::INT,   2, 0, sizeof( vertex ), false );
                m_va->add_vertex_buffer( m_color_loc, (nv::vertex_buffer*)m_quad_cache->get_buffer(), nv::FLOAT, 4, offset_of( &vertex::color ), sizeof( vertex ), false );
        }
        return true;
}

bool application::run()
{
        int keypress = 0;
        m_program->bind();
        glm::mat4 projection = glm::ortho( 0.0f, 800.0f, 600.0f, 0.0f, -1.0f, 1.0f );
        m_program->set_uniform( "projection", glm::mat4(projection) );

        while(!keypress) 
        {
                for ( auto& w : m_windows )
                {
                        w.draw();
                }
                if (m_quad_cache->commit() )
                {
                        m_va->update_vertex_buffer( m_coord_loc, (nv::vertex_buffer*)m_quad_cache->get_buffer(), false );
                        m_va->update_vertex_buffer( m_color_loc, (nv::vertex_buffer*)m_quad_cache->get_buffer(), false );
                }

                m_window->get_context()->clear( m_clear_state );
                m_program->bind();
//              m_program->set_uniform( "tex", 0 );
                m_window->get_context()->draw( nv::TRIANGLES, m_render_state, m_program, m_va, m_windows.size() * 5 * 6 );
                m_window->swap_buffers();

                nv::io_event event;
                while(m_window->poll_event(event)) 
                {      
                        switch (event.type) 
                        {
                        case nv::EV_QUIT:
                                keypress = 1;
                                break;
                        case nv::EV_KEY:
                                if (event.key.pressed)
                                {
                                        switch (event.key.code) 
                                        {
                                        case nv::KEY_N      : spawn_window(); break;
                                        case nv::KEY_C      : recolor_window(); break;
                                        case nv::KEY_K      : kill_window(); break;
                                        case nv::KEY_ESCAPE : keypress = 1; break;
                                        }
                                }
                                break;
                        }
                }
        }
        return true;
}

void application::spawn_window()
{
        glm::ivec2 a( std::rand() % 600, std::rand() % 400 );
        glm::ivec2 b( std::rand() % 200, std::rand() % 200 );
        NV_LOG( nv::LOG_INFO, "Spawn (" << a.x << "," << a.y << "x" << b.x << "," << b.y << ")" );
        m_windows.emplace_back( m_quad_cache, a, a + b, glm::vec4( 0, 0, 1, 1 ) );
}

void application::kill_window()
{
        if ( m_windows.size() == 0 ) return;
        size_t index = rand() % m_windows.size();
        m_windows.erase( m_windows.begin() + index );
}
void application::recolor_window()
{
        if ( m_windows.size() == 0 ) return;
        size_t index = rand() % m_windows.size();
        m_windows[ index ].change_color( nv::vec4( (float)rand() / float(RAND_MAX), (float)rand() / float(RAND_MAX), (float)rand() / float(RAND_MAX), 1.0 ) );
}

application::~application()
{
        m_windows.clear();
        delete m_quad_cache;

        delete m_program;
        delete m_va;
        delete m_window;
        delete m_device;
}


int main(int, char* [])
{
        std::srand((unsigned int) std::time(0) );
        nv::logger log(nv::LOG_TRACE);
        log.add_sink( new nv::log_file_sink("log.txt"), nv::LOG_TRACE );
        log.add_sink( new nv::log_console_sink(), nv::LOG_TRACE );
        
        NV_LOG( nv::LOG_NOTICE, "Logging started" );
        application app;
        if ( app.initialize() )
        {
                app.run();
        }
        NV_LOG( nv::LOG_NOTICE, "Logging stopped" );

        return 0;
}