/**
* \brief Draws the vertices in the case where there are textures.
*/
void bear::visual::gl_state::draw_textured() const
{
if ( m_vertices.empty() )
return;
enable_shader();
set_colors();
set_vertices();
set_texture_coordinates();
for ( element_range_list::const_iterator it(m_elements.begin());
it!=m_elements.end(); ++it )
{
glBindTexture( GL_TEXTURE_2D, it->texture_id );
VISUAL_GL_ERROR_THROW();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
VISUAL_GL_ERROR_THROW();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
VISUAL_GL_ERROR_THROW();
glDrawArrays( get_gl_render_mode(), it->vertex_index, it->count );
VISUAL_GL_ERROR_THROW();
}
disable_states();
} // gl_state::draw_textured()
/**
* \brief Passes the color pointer to OpenGL.
*/
void bear::visual::gl_state::set_colors() const
{
glEnableClientState( GL_COLOR_ARRAY );
VISUAL_GL_ERROR_THROW();
glColorPointer( 4, GL_FLOAT, 0, m_colors.data() );
VISUAL_GL_ERROR_THROW();
} // gl_state::set_colors()
/**
* \brief Passes the vertex pointer to OpenGL.
*/
void bear::visual::gl_state::set_vertices() const
{
glEnableClientState( GL_VERTEX_ARRAY );
VISUAL_GL_ERROR_THROW();
glVertexPointer( 2, GL_FLOAT, 0, m_vertices.data() );
VISUAL_GL_ERROR_THROW();
} // gl_state::set_vertices()
/**
* \brief Passes the pointer on the texture coordinates to OpenGL.
*/
void bear::visual::gl_state::set_texture_coordinates() const
{
glEnableClientState( GL_TEXTURE_COORD_ARRAY );
VISUAL_GL_ERROR_THROW();
glTexCoordPointer( 2, GL_FLOAT, 0, m_texture_coordinates.data() );
VISUAL_GL_ERROR_THROW();
} // gl_state::set_texture_coordinates()
/**
* \brief Draw a filled polygon.
* \param color The color of the polygon.
* \param p The points of the polygon.
*/
void bear::visual::gl_screen::draw_polygon
( const color_type& color, const std::vector<position_type>& p )
{
glBindTexture( GL_TEXTURE_2D, 0 );
VISUAL_GL_ERROR_THROW();
const GLfloat max = std::numeric_limits<color_type::component_type>::max();
if (color.components.alpha != max)
{
glEnable(GL_BLEND);
VISUAL_GL_ERROR_THROW();
}
glBegin(GL_QUADS);
{
glColor4f( (GLfloat)color.components.red / max,
(GLfloat)color.components.green / max,
(GLfloat)color.components.blue / max,
(GLfloat)color.components.alpha / max );
for ( unsigned int i=0; i!=p.size(); ++i )
glVertex3f( p[i].x, p[i].y, m_z_position );
}
glEnd();
VISUAL_GL_ERROR_THROW();
update_z_position();
if (color.components.alpha != max)
{
glDisable(GL_BLEND);
VISUAL_GL_ERROR_THROW();
}
} // gl_screen::draw_polygon()
/**
* \brief Tells OpenGL to disable the texture coordinates, the vertices and the
* colors.
*/
void bear::visual::gl_state::disable_states() const
{
glDisableClientState( GL_TEXTURE_COORD_ARRAY );
VISUAL_GL_ERROR_THROW();
glDisableClientState( GL_VERTEX_ARRAY );
VISUAL_GL_ERROR_THROW();
glDisableClientState( GL_COLOR_ARRAY );
VISUAL_GL_ERROR_THROW();
} // gl_state::draw_textured()
/**
* \brief Draw current texture.
* \param render_box On gl_screen position and size of the texture.
* \param clip Part of the texture to draw.
*/
void bear::visual::gl_screen::render_image
( const claw::math::coordinate_2d<GLdouble> render_coord[],
const claw::math::box_2d<GLdouble>& clip )
{
glBegin(GL_QUADS);
{
// Top-left corner
glTexCoord2d( clip.first_point.x, clip.first_point.y );
glVertex3d(render_coord[0].x, render_coord[0].y, m_z_position);
// Top-right corner
glTexCoord2d( clip.second_point.x, clip.first_point.y );
glVertex3d(render_coord[1].x, render_coord[1].y, m_z_position);
// Bottom-right corner
glTexCoord2d( clip.second_point.x, clip.second_point.y );
glVertex3d(render_coord[2].x, render_coord[2].y, m_z_position);
// Bottom-left corner
glTexCoord2d( clip.first_point.x, clip.second_point.y );
glVertex3d(render_coord[3].x, render_coord[3].y, m_z_position);
}
glEnd();
VISUAL_GL_ERROR_THROW();
update_z_position();
} // gl_screen::render_image()
/**
* \brief Sets the value of a boolean uniform.
* \param name The name of the uniform.
* \param value The value to assign to the uniform.
*/
void
bear::visual::gl_state::uniform_setter::operator()
( std::string name, bool value ) const
{
glUniform1i( glGetUniformLocation( m_program, name.c_str() ), value);
VISUAL_GL_ERROR_THROW();
} // gl_state::uniform_setter::operator()()
void bear::visual::detail::uniform_setter::operator()
( const std::string& name, const std::array< float, 16 >& value ) const
{
glUniformMatrix4fv
( glGetUniformLocation( m_program, name.c_str() ),
1, GL_FALSE, value.data() );
VISUAL_GL_ERROR_THROW();
}
/**
* \brief Stop the rendering process.
* \return false if this screen has been closed by the user.
*/
bool bear::visual::gl_screen::end_render()
{
glFlush();
SDL_GL_SwapBuffers();
VISUAL_GL_ERROR_THROW();
return !is_closed();
} // gl_screen::end_render()
/**
* \brief Sets a new dimension for the resulting projection to match the size of
* the screen.
*/
void bear::visual::gl_screen::resize_view()
{
glViewport( 0, 0, m_window_size.x, m_window_size.y );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho( 0, m_size.x, 0, m_size.y, -1, 0 );
glMatrixMode(GL_MODELVIEW);
VISUAL_GL_ERROR_THROW();
} // gl_screen::resize_view()
/**
* \brief Enables the shader of the state.
*/
void bear::visual::gl_state::enable_shader() const
{
if ( !m_shader.is_valid() )
{
glUseProgram( 0 );
VISUAL_GL_ERROR_THROW();
return;
}
const gl_shader_program* const s
( static_cast<const gl_shader_program*>( m_shader.get_impl() ) );
glUseProgram( s->program_id() );
VISUAL_GL_ERROR_THROW();
shader_program::variable_visitor_type visitor;
shader_program::input_variable_map vars( m_shader.get_variables() );
visitor.run( vars, uniform_setter( s->program_id() ) );
} // gl_state::enable_shader()
/**
* \brief Initialize the rendering process.
*/
void bear::visual::gl_screen::begin_render()
{
VISUAL_GL_ERROR_THROW();
while ( !m_shader.empty() )
pop_shader();
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
m_z_position = 0;
resize_view();
} // gl_screen::begin_render()
/**
* \brief Enables a given shader.
* \param p The shader to enable.
*/
void bear::visual::gl_screen::use_program( const shader_program& p ) const
{
const gl_shader_program* const s
( static_cast<const gl_shader_program*>(p.get_impl()) );
glUseProgram( s->program_id() );
VISUAL_GL_ERROR_THROW();
shader_program::variable_visitor_type visitor;
shader_program::input_variable_map vars( p.get_variables() );
visitor.run( vars, uniform_setter( s->program_id() ) );
} // gl_screen::use_program()
/**
* \brief Draws the vertices in the case where there is no texture.
*/
void bear::visual::gl_state::draw_shape() const
{
if ( m_vertices.empty() )
return;
enable_shader();
if ( m_line_width > 0 )
{
glLineWidth( m_line_width );
VISUAL_GL_ERROR_THROW();
}
set_colors();
set_vertices();
glBindTexture( GL_TEXTURE_2D, 0 );
VISUAL_GL_ERROR_THROW();
glDrawArrays( get_gl_render_mode(), 0, get_vertex_count() );
disable_states();
} // gl_state::draw_shape()
void bear::visual::detail::apply_shader( const shader_program& shader )
{
assert ( shader.is_valid() );
const gl_shader_program* const s
( static_cast<const gl_shader_program*>( shader.get_impl() ) );
assert( s->program_id() != 0 );
glUseProgram( s->program_id() );
VISUAL_GL_ERROR_THROW();
shader_program::variable_visitor_type visitor;
shader_program::input_variable_map vars( shader.get_variables() );
visitor.run( vars, uniform_setter( s->program_id() ) );
}
/**
* \brief Do a screen shot.
* \param img The image in which we save the content of the gl_screen.
*/
void bear::visual::gl_screen::shot( claw::graphic::image& img ) const
{
GLint p[4];
glGetIntegerv( GL_VIEWPORT, p );
const unsigned int w = p[2];
const unsigned int h = p[3];
img.set_size( w, h );
const std::size_t pixels_count(w * h);
glReadPixels( 0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, m_screenshot_buffer );
VISUAL_GL_ERROR_THROW();
for ( claw::graphic::rgba_pixel_8* it=m_screenshot_buffer;
it!=m_screenshot_buffer + pixels_count;
++it )
it->components.alpha = 255;
for (unsigned int y=0; y!=h; ++y)
std::copy( m_screenshot_buffer + y * w,
m_screenshot_buffer + (y+1) * w,
img[h - y - 1].begin() );
} // gl_screen::shot()
/**
* \brief Draw a sprite on the gl_screen.
* \param pos On gl_screen position of the sprite.
* \param s The sprite to draw.
*/
void bear::visual::gl_screen::render
( const position_type& pos, const sprite& s )
{
if ( s.has_transparency() )
{
glEnable(GL_BLEND);
VISUAL_GL_ERROR_THROW();
}
glColor4f( s.get_red_intensity(), s.get_green_intensity(),
s.get_blue_intensity(), s.get_opacity() );
const gl_image* impl = static_cast<const gl_image*>(s.get_image().get_impl());
glBindTexture( GL_TEXTURE_2D, impl->texture_id() );
VISUAL_GL_ERROR_THROW();
if ( s.get_angle() == 0 )
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
VISUAL_GL_ERROR_THROW();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
VISUAL_GL_ERROR_THROW();
}
else
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
VISUAL_GL_ERROR_THROW();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
VISUAL_GL_ERROR_THROW();
}
render_sprite( pos, s );
if ( s.has_transparency() )
{
glDisable(GL_BLEND);
VISUAL_GL_ERROR_THROW();
}
} // gl_screen::render()
/**
* \brief Set the size of the screen.
* \param w The width of the screen.
* \param h The height of the screen.
* \param f Tell if we want a fullscreen mode.
*/
void bear::visual::gl_screen::set_video_mode
( unsigned int w, unsigned int h, bool f )
{
const screen_size_type best_size( get_best_screen_size(w, h, f) );
SDL_Surface* const current_surface = SDL_GetVideoSurface();
if ( current_surface != NULL )
{
if ( ( ( (current_surface->flags & SDL_FULLSCREEN) != 0) == f )
&& (w == (unsigned int)current_surface->w)
&& (h != (unsigned int)current_surface->h) )
return;
}
#ifdef _WIN32
release();
initialize();
#endif
Uint32 flags = SDL_OPENGL;
if (f)
flags |= SDL_FULLSCREEN;
claw::logger << "Setting video mode to " << best_size.x << 'x' << best_size.y
<< ' ' << (f ? "fullscreen" : "windowed") << std::endl;
SDL_EventState( SDL_QUIT, SDL_DISABLE );
SDL_Surface* s = SDL_SetVideoMode( best_size.x, best_size.y, 32, flags );
SDL_EventState( SDL_QUIT, SDL_ENABLE );
if (!s)
throw claw::exception( SDL_GetError() );
m_window_size = best_size;
delete[] m_screenshot_buffer;
m_screenshot_buffer =
new claw::graphic::rgba_pixel_8[ best_size.x * best_size.y ];
SDL_ShowCursor(0);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearDepth(1.0);
#ifdef _WIN32
glEnable(GL_TEXTURE_2D);
VISUAL_GL_ERROR_THROW();
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
VISUAL_GL_ERROR_THROW();
SDL_WM_SetCaption( m_title.c_str(), NULL );
claw::logger << claw::log_verbose << "Screen needs restoration (was "
<< m_need_restoration << ")." << std::endl;
m_need_restoration = true;
#endif
} // gl_screen::set_video_mode()
void bear::visual::detail::uniform_setter::operator()
( const std::string& name, float value ) const
{
glUniform1f( glGetUniformLocation( m_program, name.c_str() ), value);
VISUAL_GL_ERROR_THROW();
}
