vg_loader.c

   1 #include "vg_engine.h"
   2 #include "vg_loader.h"
   3 #include "vg_shader.h"
   4 #include "vg_async.h"
   5
   6 struct vg_loader vg_loader;
   7
   8 static struct vg_shader _shader_loader =
   9 {
  10    .name = "[vg] loader",
  11
  12    /* This is the new foreground shader */
  13    .vs =
  14    {
  15       .orig_file = NULL,
  16       .static_src = ""
  17       "layout (location=0) in vec2 a_co;"
  18       "out vec2 aUv;"
  19       "void main()"
  20       "{"
  21          "gl_Position = vec4(a_co*2.0-1.0,0.0,1.0);"
  22          "aUv = a_co;"
  23       "}"
  24    },
  25    .fs =
  26    {
  27       .orig_file = NULL,
  28       .static_src =
  29
  30       "out vec4 FragColor;"
  31       "uniform float uTime;"
  32       "uniform float uRatio;"
  33       "uniform float uOpacity;"
  34       "in vec2 aUv;"
  35
  36       "float eval_zero( vec2 uv )"
  37       "{"
  38          "vec4 vsines = sin( (uTime+uv.y*80.0) * vec4(1.1,2.0234,3.73,2.444) );"
  39          "float gradient = min( uv.y, 0.0 );"
  40          "float offset = vsines.x*vsines.y*vsines.z*vsines.w*gradient;"
  41
  42          "vec2 vpos = uv + vec2( offset, 0.0 );"
  43          "float dist = dot( vpos, vpos );"
  44
  45          "float fring = step(0.1*0.1,dist) * step(dist,0.15*0.15);"
  46          "return max( 0.0, fring * 1.0+gradient*6.0 );"
  47       "}"
  48
  49       "void main()"
  50       "{"
  51          "vec3 col = 0.5+0.5*sin( uTime + aUv.xyx + vec3(0.0,2.0,4.0) );"
  52
  53          "vec2 uvx = aUv - vec2( 0.5 );"
  54          "uvx.x *= uRatio;"
  55          "uvx.y *= 0.75;"
  56
  57          "float zero = eval_zero( uvx );"
  58
  59          "float dither=fract(dot(vec2(171.0,231.0),gl_FragCoord.xy)/71.0)-0.5;"
  60          "float fmt1 = step( 0.5, zero*zero + dither )*0.8+0.2;"
  61
  62          "FragColor = vec4(vec3(fmt1),uOpacity);"
  63       "}"
  64    }
  65 };
  66
  67 void vg_loader_init(void)
  68 {
  69    float quad[] = { 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
  70                     0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f };
  71
  72    glGenVertexArrays( 1, &vg_loader.vao );
  73    glGenBuffers( 1, &vg_loader.vbo );
  74    glBindVertexArray( vg_loader.vao );
  75    glBindBuffer( GL_ARRAY_BUFFER, vg_loader.vbo );
  76    glBufferData( GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW );
  77    glBindVertexArray( vg_loader.vao );
  78    glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, sizeof(float)*2, (void*)0 );
  79    glEnableVertexAttribArray( 0 );
  80
  81    VG_CHECK_GL_ERR();
  82
  83    if( !vg_shader_compile( &_shader_loader ) )
  84       vg_fatal_error( "failed to compile shader" );
  85 }
  86
  87 static void vg_loader_free(void)
  88 {
  89    vg_info( "vg_loader_free\n" );
  90    glDeleteVertexArrays( 1, &vg_loader.vao );
  91    glDeleteBuffers( 1, &vg_loader.vbo );
  92
  93    for( int i=0; i<vg_loader.step_count; i++ )
  94    {
  95       struct loader_free_step *step =
  96          &vg_loader.step_buffer[vg_loader.step_count -1 -i];
  97
  98       vg_info( " -> %p\n", step->fn_free );
  99       step->fn_free();
 100    }
 101 }
 102
 103 void vg_loader_render_ring( f32 opacity )
 104 {
 105    glEnable(GL_BLEND);
 106    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 107    glBlendEquation(GL_FUNC_ADD);
 108
 109    opacity *= opacity;
 110
 111    glUseProgram( _shader_loader.id );
 112         glUniform1f( glGetUniformLocation( _shader_loader.id, "uTime" ), vg.time );
 113    f32 ratio = (f32)vg.window_x / (f32)vg.window_y;
 114    glUniform1f( glGetUniformLocation( _shader_loader.id, "uRatio"), ratio );
 115    glUniform1f( glGetUniformLocation( _shader_loader.id, "uOpacity"), opacity );
 116    glBindVertexArray( vg_loader.vao );
 117    glDrawArrays( GL_TRIANGLES, 0, 6 );
 118 }
 119
 120 void vg_loader_render(void)
 121 {
 122    glViewport( 0,0, vg.window_x, vg.window_y );
 123    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 124    glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
 125    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 126    vg.loader_ring = 1.0f;
 127 }
 128
 129 static int _vg_loader_thread( void *pfn ){
 130    if( setjmp( vg.env_loader_exit ) )
 131       return 0;
 132
 133    /* Run client loader */
 134    //vg_info( "Starting client loader thread @%p\n", pfn );
 135    void (*call_func)(void *data) = pfn;
 136    call_func( vg.thread_data );
 137
 138    SDL_SemPost( vg.sem_loader );
 139    vg.thread_id_loader = 0;
 140
 141    return 0;
 142 }
 143
 144 int vg_loader_availible(void)
 145 {
 146    if( SDL_SemValue( vg.sem_loader ) ){
 147       if( !(vg_async.start) )
 148          return 1;
 149    }
 150
 151    return 0;
 152 }
 153
 154 void vg_loader_start( void(*pfn)(void *data), void *data )
 155 {
 156    SDL_SemWait( vg.sem_loader );
 157
 158    vg.thread_data = data;
 159    SDL_CreateThread( _vg_loader_thread, "vg: loader", pfn );
 160 }
 161
 162 /*
 163  * Schedule something to be ran now, freed later. Checks in with engine status
 164  */
 165 void _vg_loader_step( void( *fn_load )(void), void( *fn_free )(void),
 166                       const char *alias ){
 167
 168    u64 t0 = SDL_GetPerformanceCounter();
 169    vg.time_hp_last = vg.time_hp;
 170
 171    if( fn_load )
 172       fn_load();
 173
 174    u64 udt = SDL_GetPerformanceCounter() - t0;
 175    double dt = (double)udt / (double)SDL_GetPerformanceFrequency();
 176    vg_info( "ltime [%p] %s: %fs\n", fn_load, alias, dt );
 177
 178    if( fn_free ){
 179       struct loader_free_step step;
 180       step.fn_free = fn_free;
 181
 182       if( vg_loader.step_count == vg_list_size(vg_loader.step_buffer) )
 183          vg_fatal_error( "Too many free steps" );
 184
 185       vg_loader.step_buffer[ vg_loader.step_count ++ ] = step;
 186    }
 187
 188    /* TODO: There was a quit checker here, re-add this? */
 189 }