vg_loader.h

   1 /*
   2  * Copyright 2021-2022 (C) Mount0 Software, Harry Godden - All Rights Reserved
   3  * -----------------------------------------------------------------------------
   4  *
   5  * Splash / load screen
   6  *
   7  * -----------------------------------------------------------------------------
   8  */
   9
  10 #ifndef VG_LOADER_H
  11 #define VG_LOADER_H
  12
  13 #include "common.h"
  14
  15 VG_STATIC void vg_loader_start( void(*pfn)(void) );
  16 VG_STATIC void vg_loader_step( void( *fn_load )(void), void( *fn_free )(void) );
  17
  18 static struct vg_shader _shader_loader =
  19 {
  20    .name = "[vg] loader",
  21    .link = NULL,
  22
  23    /* This is the old background shader */
  24 #if 0
  25    .vs =
  26    {
  27       .orig_file = NULL,
  28       .static_src = ""
  29       "layout (location=0) in vec2 a_co;"
  30       "out vec2 aUv;"
  31       "void main()"
  32       "{"
  33          "gl_Position = vec4(a_co*2.0-1.0,0.0,1.0);"
  34          "aUv = a_co;"
  35       "}"
  36    },
  37    .fs =
  38    {
  39       .orig_file = NULL,
  40       .static_src =
  41
  42       "out vec4 FragColor;"
  43       "uniform float uTime;"
  44       "in vec2 aUv;"
  45
  46       "void main()"
  47       "{"
  48          "float dither=fract(dot(vec2(171.0,231.0),gl_FragCoord.xy)/71.0)-0.5;"
  49          "float grad = 1.0-(aUv.y*0.5+0.5)*0.5;"
  50          "float fmt1 = step( 0.5, grad+dither );"
  51
  52          "vec3 col = 0.5+0.5*sin( uTime + aUv.xyx + vec3(0.0,2.0,4.0) );"
  53
  54          "FragColor = vec4(vec3(0.5,0.5,0.5)*grad*fmt1,1.0);"
  55       "}"
  56    }
  57 #else
  58
  59    /* This is the new foreground shader */
  60
  61    .vs =
  62    {
  63       .orig_file = NULL,
  64       .static_src = ""
  65       "layout (location=0) in vec2 a_co;"
  66       "out vec2 aUv;"
  67       "void main()"
  68       "{"
  69          "gl_Position = vec4(a_co*2.0-1.0,0.0,1.0);"
  70          "aUv = a_co;"
  71       "}"
  72    },
  73    .fs =
  74    {
  75       .orig_file = NULL,
  76       .static_src =
  77
  78       "out vec4 FragColor;"
  79       "uniform float uTime;"
  80       "uniform float uRatio;"
  81       "in vec2 aUv;"
  82
  83       "float eval_zero( vec2 uv )"
  84       "{"
  85          "vec4 vsines = sin( (uTime+uv.y*80.0) * vec4(1.1,2.0234,3.73,2.444) );"
  86          "float gradient = min( uv.y, 0.0 );"
  87          "float offset = vsines.x*vsines.y*vsines.z*vsines.w*gradient;"
  88
  89          "vec2 vpos = uv + vec2( offset, 0.0 );"
  90          "float dist = dot( vpos, vpos );"
  91
  92          "float fring = step(0.1*0.1,dist) * step(dist,0.15*0.15);"
  93          "return max( 0.0, fring * 1.0+gradient*6.0 );"
  94       "}"
  95
  96       "void main()"
  97       "{"
  98
  99          "vec3 col = 0.5+0.5*sin( uTime + aUv.xyx + vec3(0.0,2.0,4.0) );"
 100
 101          "vec2 uvx = aUv - vec2( 0.5 );"
 102          "uvx.x *= uRatio;"
 103          "uvx.y *= 0.75;"
 104
 105          "float zero = eval_zero( uvx );"
 106
 107          "float dither=fract(dot(vec2(171.0,231.0),gl_FragCoord.xy)/71.0)-0.5;"
 108          "float fmt1 = step( 0.5, zero*zero + dither )*0.8+0.2;"
 109
 110          "FragColor = vec4(vec3(fmt1),0.8);"
 111       "}"
 112    }
 113
 114 #endif
 115 };
 116
 117 static struct vg_loader
 118 {
 119    /* Shutdown steps */
 120    struct loader_free_step
 121    {
 122       void (*fn_free)(void);
 123    }
 124    step_buffer[16];
 125    u32 step_count, step_action;
 126
 127    GLuint vao, vbo;
 128 }
 129 vg_loader;
 130
 131 VG_STATIC void _vg_loader_init(void)
 132 {
 133    float quad[] = { 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
 134                     0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f };
 135
 136    glGenVertexArrays( 1, &vg_loader.vao );
 137    glGenBuffers( 1, &vg_loader.vbo );
 138    glBindVertexArray( vg_loader.vao );
 139    glBindBuffer( GL_ARRAY_BUFFER, vg_loader.vbo );
 140    glBufferData( GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW );
 141    glBindVertexArray( vg_loader.vao );
 142    glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, sizeof(float)*2, (void*)0 );
 143    glEnableVertexAttribArray( 0 );
 144
 145    VG_CHECK_GL_ERR();
 146
 147    if( !vg_shader_compile( &_shader_loader ) )
 148       vg_fatal_exit_loop( "failed to compile shader" );
 149 }
 150
 151 VG_STATIC void _vg_loader_free(void)
 152 {
 153    vg_info( "vg_loader_free\n" );
 154    glDeleteVertexArrays( 1, &vg_loader.vao );
 155    glDeleteBuffers( 1, &vg_loader.vbo );
 156
 157    for( int i=0; i<vg_loader.step_count; i++ )
 158    {
 159       struct loader_free_step *step =
 160          &vg_loader.step_buffer[vg_loader.step_count -1 -i];
 161
 162       vg_info( " -> %p\n", step->fn_free );
 163       step->fn_free();
 164    }
 165
 166    vg_info( "done\n" );
 167 }
 168
 169 VG_STATIC void _vg_render_log(void)
 170 {
 171    ui_begin( vg.window_x, vg.window_y );
 172    SDL_AtomicLock( &log_print_sl );
 173
 174    int const fh = 14;
 175    int lines_screen_max = ((vg.window_y/fh)-2),
 176        lines_max_draw = VG_MIN( lines_screen_max, vg_list_size(vg_log.buffer) ),
 177        lines_to_draw  = VG_MIN( lines_max_draw, vg_log.buffer_line_count );
 178
 179         int ptr = vg_log.buffer_line_current;
 180
 181         vg_uictx.cursor[0] = 0;
 182         vg_uictx.cursor[1] = lines_to_draw*fh;
 183    vg_uictx.cursor[3] = fh;
 184         ui_fill_x();
 185
 186    for( int i=0; i<lines_to_draw; i ++ )
 187    {
 188       ptr --;
 189
 190       if( ptr < 0 )
 191          ptr = vg_list_size( vg_log.buffer )-1;
 192
 193       ui_text( vg_uictx.cursor, vg_log.buffer[ptr], 1, 0 );
 194       vg_uictx.cursor[1] -= fh;
 195    }
 196
 197    SDL_AtomicUnlock( &log_print_sl );
 198
 199    ui_resolve();
 200    ui_draw( NULL );
 201 }
 202
 203 VG_STATIC void _vg_loader_render(void)
 204 {
 205    glViewport( 0,0, vg.window_x, vg.window_y );
 206    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 207    glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
 208    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 209
 210 #if 0
 211    glUseProgram( _shader_loader.id );
 212         glUniform1f( glGetUniformLocation( _shader_loader.id, "uTime" ), vg.time );
 213    glBindVertexArray( vg_loader.vao );
 214    glDrawArrays( GL_TRIANGLES, 0, 6 );
 215 #endif
 216
 217    _vg_render_log();
 218
 219 #if 1
 220    glEnable(GL_BLEND);
 221    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 222    glBlendEquation(GL_FUNC_ADD);
 223
 224    glUseProgram( _shader_loader.id );
 225         glUniform1f( glGetUniformLocation( _shader_loader.id, "uTime" ), vg.time );
 226    float ratio = (float)vg.window_x / (float)vg.window_y;
 227    glUniform1f( glGetUniformLocation( _shader_loader.id, "uRatio"), ratio );
 228    glBindVertexArray( vg_loader.vao );
 229    glDrawArrays( GL_TRIANGLES, 0, 6 );
 230 #endif
 231 }
 232
 233
 234 VG_STATIC void vg_load_full(void);
 235
 236 VG_STATIC int _vg_loader_thread(void *pfn)
 237 {
 238    SDL_AtomicLock( &vg.sl_context );
 239    vg.thread_id_loader = SDL_GetThreadID(NULL);
 240    VG_SYNC_LOG( "[%d] Loader thread begins\n" );
 241    SDL_AtomicUnlock( &vg.sl_context );
 242
 243    /* Run client loader */
 244    void (*call_func)(void) = pfn;
 245    call_func();
 246
 247    SDL_SemPost( vg.sem_loader );
 248    vg.thread_id_loader = 0;
 249
 250    vg_acquire_thread_sync();
 251    vg.is_loaded = 1;
 252    vg_release_thread_sync();
 253
 254    return 0;
 255 }
 256
 257 VG_STATIC void vg_loader_start( void(*pfn)(void) )
 258 {
 259    vg.is_loaded = 0;
 260    SDL_SemWait( vg.sem_loader );
 261    SDL_CreateThread( _vg_loader_thread, "Loader thread", pfn );
 262 }
 263
 264 /*
 265  * Schedule something to be ran now, freed later. Checks in with engine status
 266  */
 267 VG_STATIC void vg_loader_step( void( *fn_load )(void), void( *fn_free )(void) )
 268 {
 269    if( fn_load )
 270       fn_load();
 271
 272    if( fn_free )
 273    {
 274       struct loader_free_step step;
 275       step.fn_free = fn_free;
 276
 277       if( vg_loader.step_count == vg_list_size(vg_loader.step_buffer) )
 278          vg_fatal_exit_loop( "Too many free steps" );
 279
 280       vg_loader.step_buffer[ vg_loader.step_count ++ ] = step;
 281    }
 282
 283    _vg_ensure_engine_running();
 284 }
 285
 286 #endif /* VG_LOADER_H */