vg_loader.c

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