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 new foreground shader */
  24    .vs =
  25    {
  26       .orig_file = NULL,
  27       .static_src = ""
  28       "layout (location=0) in vec2 a_co;"
  29       "out vec2 aUv;"
  30       "void main()"
  31       "{"
  32          "gl_Position = vec4(a_co*2.0-1.0,0.0,1.0);"
  33          "aUv = a_co;"
  34       "}"
  35    },
  36    .fs =
  37    {
  38       .orig_file = NULL,
  39       .static_src =
  40
  41       "out vec4 FragColor;"
  42       "uniform float uTime;"
  43       "uniform float uRatio;"
  44       "uniform float uOpacity;"
  45       "in vec2 aUv;"
  46
  47       "float eval_zero( vec2 uv )"
  48       "{"
  49          "vec4 vsines = sin( (uTime+uv.y*80.0) * vec4(1.1,2.0234,3.73,2.444) );"
  50          "float gradient = min( uv.y, 0.0 );"
  51          "float offset = vsines.x*vsines.y*vsines.z*vsines.w*gradient;"
  52
  53          "vec2 vpos = uv + vec2( offset, 0.0 );"
  54          "float dist = dot( vpos, vpos );"
  55
  56          "float fring = step(0.1*0.1,dist) * step(dist,0.15*0.15);"
  57          "return max( 0.0, fring * 1.0+gradient*6.0 );"
  58       "}"
  59
  60       "void main()"
  61       "{"
  62
  63          "vec3 col = 0.5+0.5*sin( uTime + aUv.xyx + vec3(0.0,2.0,4.0) );"
  64
  65          "vec2 uvx = aUv - vec2( 0.5 );"
  66          "uvx.x *= uRatio;"
  67          "uvx.y *= 0.75;"
  68
  69          "float zero = eval_zero( uvx );"
  70
  71          "float dither=fract(dot(vec2(171.0,231.0),gl_FragCoord.xy)/71.0)-0.5;"
  72          "float fmt1 = step( 0.5, zero*zero + dither )*0.8+0.2;"
  73
  74          "FragColor = vec4(vec3(fmt1),uOpacity);"
  75       "}"
  76    }
  77 };
  78
  79 static struct vg_loader
  80 {
  81    /* Shutdown steps */
  82    struct loader_free_step
  83    {
  84       void (*fn_free)(void);
  85    }
  86    step_buffer[16];
  87    u32 step_count, step_action;
  88
  89    GLuint vao, vbo;
  90 }
  91 vg_loader;
  92
  93 VG_STATIC void _vg_loader_init(void)
  94 {
  95    float quad[] = { 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
  96                     0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f };
  97
  98    glGenVertexArrays( 1, &vg_loader.vao );
  99    glGenBuffers( 1, &vg_loader.vbo );
 100    glBindVertexArray( vg_loader.vao );
 101    glBindBuffer( GL_ARRAY_BUFFER, vg_loader.vbo );
 102    glBufferData( GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW );
 103    glBindVertexArray( vg_loader.vao );
 104    glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, sizeof(float)*2, (void*)0 );
 105    glEnableVertexAttribArray( 0 );
 106
 107    VG_CHECK_GL_ERR();
 108
 109    if( !vg_shader_compile( &_shader_loader ) )
 110       vg_fatal_error( "failed to compile shader" );
 111 }
 112
 113 VG_STATIC void _vg_loader_free(void)
 114 {
 115    vg_info( "vg_loader_free\n" );
 116    glDeleteVertexArrays( 1, &vg_loader.vao );
 117    glDeleteBuffers( 1, &vg_loader.vbo );
 118
 119    for( int i=0; i<vg_loader.step_count; i++ )
 120    {
 121       struct loader_free_step *step =
 122          &vg_loader.step_buffer[vg_loader.step_count -1 -i];
 123
 124       vg_info( " -> %p\n", step->fn_free );
 125       step->fn_free();
 126    }
 127 }
 128
 129 VG_STATIC void _vg_render_log(void)
 130 {
 131    ui_begin( vg.window_x, vg.window_y );
 132    SDL_AtomicLock( &log_print_sl );
 133
 134    int const fh = 14;
 135    int lines_screen_max = ((vg.window_y/fh)-2),
 136        lines_max_draw = VG_MIN( lines_screen_max, vg_list_size(vg_log.buffer) ),
 137        lines_to_draw  = VG_MIN( lines_max_draw, vg_log.buffer_line_count );
 138
 139         int ptr = vg_log.buffer_line_current;
 140
 141         vg_uictx.cursor[0] = 0;
 142         vg_uictx.cursor[1] = lines_to_draw*fh;
 143    vg_uictx.cursor[3] = fh;
 144         ui_fill_x();
 145
 146    for( int i=0; i<lines_to_draw; i ++ ){
 147       ptr --;
 148
 149       if( ptr < 0 )
 150          ptr = vg_list_size( vg_log.buffer )-1;
 151
 152       ui_text( vg_uictx.cursor, vg_log.buffer[ptr], 1, 0 );
 153       vg_uictx.cursor[1] -= fh;
 154    }
 155
 156    SDL_AtomicUnlock( &log_print_sl );
 157
 158    ui_resolve();
 159    ui_draw( NULL );
 160 }
 161
 162 VG_STATIC void _vg_loader_render_ring( float opacity )
 163 {
 164    glEnable(GL_BLEND);
 165    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 166    glBlendEquation(GL_FUNC_ADD);
 167
 168    glUseProgram( _shader_loader.id );
 169         glUniform1f( glGetUniformLocation( _shader_loader.id, "uTime" ), vg.time );
 170    float ratio = (float)vg.window_x / (float)vg.window_y;
 171    glUniform1f( glGetUniformLocation( _shader_loader.id, "uRatio"), ratio );
 172    glUniform1f( glGetUniformLocation( _shader_loader.id, "uOpacity"), opacity );
 173    glBindVertexArray( vg_loader.vao );
 174    glDrawArrays( GL_TRIANGLES, 0, 6 );
 175 }
 176
 177 VG_STATIC void _vg_loader_render(void)
 178 {
 179    glViewport( 0,0, vg.window_x, vg.window_y );
 180    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 181    glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
 182    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 183
 184    _vg_render_log();
 185    vg.loader_ring = 0.8f;
 186 }
 187
 188
 189 VG_STATIC void vg_load_full(void);
 190
 191 VG_STATIC int _vg_loader_thread(void *pfn)
 192 {
 193    if( setjmp( vg.env_loader_exit ) )
 194       return 0;
 195
 196    /* Run client loader */
 197    vg_info( "Starting client loader thread @%p\n", pfn );
 198    void (*call_func)(void) = pfn;
 199    call_func();
 200
 201    SDL_SemPost( vg.sem_loader );
 202    vg.thread_id_loader = 0;
 203
 204    return 0;
 205 }
 206
 207 VG_STATIC void vg_loader_start( void(*pfn)(void) )
 208 {
 209    SDL_SemWait( vg.sem_loader );
 210    SDL_CreateThread( _vg_loader_thread, "Loader thread", pfn );
 211 }
 212
 213 /*
 214  * Schedule something to be ran now, freed later. Checks in with engine status
 215  */
 216 VG_STATIC void vg_loader_step( void( *fn_load )(void), void( *fn_free )(void) )
 217 {
 218    if( fn_load )
 219       fn_load();
 220
 221    if( fn_free ){
 222       struct loader_free_step step;
 223       step.fn_free = fn_free;
 224
 225       if( vg_loader.step_count == vg_list_size(vg_loader.step_buffer) )
 226          vg_fatal_error( "Too many free steps" );
 227
 228       vg_loader.step_buffer[ vg_loader.step_count ++ ] = step;
 229    }
 230
 231    /* TODO: There was a quit checker here, re-add this? */
 232 }
 233
 234 #endif /* VG_LOADER_H */