render.h

   1 #include "common.h"
   2 #include "model.h"
   3
   4 #include "shaders/blit.h"
   5 #include "shaders/standard.h"
   6 #include "shaders/vblend.h"
   7 #include "shaders/unlit.h"
   8
   9 static void render_water_texture( m4x3f camera );
  10 static void render_water_surface( m4x4f pv, m4x3f camera );
  11 static void render_world( m4x4f projection, m4x3f camera );
  12 static void shader_link_standard_ub( GLuint shader, int texture_id );
  13 static void render_world_depth( m4x4f projection, m4x3f camera );
  14
  15 #ifndef RENDER_H
  16 #define RENDER_H
  17
  18 struct framebuffer
  19 {
  20    GLuint fb, colour, rb;
  21    int div;
  22    GLuint format;
  23
  24    int allocated;
  25 };
  26
  27 static struct pipeline
  28 {
  29    float fov;
  30    glmesh fsquad;
  31
  32    GLuint fb_background,
  33           rgb_background;
  34
  35    /* STD140 */
  36    struct ub_world_lighting
  37    {
  38       /* v3f (padded) */
  39       v4f g_light_colours[3],
  40           g_light_directions[3],
  41           g_ambient_colour;
  42
  43       v4f g_water_plane,
  44           g_depth_bounds;
  45
  46       float g_water_fog;
  47       int g_light_count;
  48       int g_light_preview;
  49    }
  50    ub_world_lighting;
  51
  52    struct light_widget
  53    {
  54       int enabled;
  55       v2f dir;
  56       v3f colour;
  57    }
  58    widgets[3];
  59
  60    float shadow_spread, shadow_length;
  61
  62    GLuint fb_depthmap, rgb_depthmap;
  63    GLuint ubo_world_lighting,
  64           ubo_world;
  65
  66    int ready;
  67 }
  68 gpipeline =
  69 {
  70    .widgets =
  71    {
  72       {
  73          .enabled = 1,
  74          .colour = { 1.36f, 1.35f, 1.01f },
  75          .dir = { 0.63f, -0.08f }
  76       },
  77       {
  78          .enabled = 1,
  79          .colour = { 0.33f, 0.56f, 0.64f },
  80          .dir = { -2.60f, -0.13f }
  81       },
  82       {
  83          .enabled = 1,
  84          .colour = { 0.05f, 0.05f, 0.23f },
  85          .dir = { 2.60f, -0.84f }
  86       }
  87    },
  88    .shadow_spread = 0.65f,
  89    .shadow_length = 9.50f,
  90
  91    .ub_world_lighting =
  92    {
  93       .g_ambient_colour = { 0.09f, 0.03f, 0.07f }
  94    }
  95 };
  96
  97 /*
  98  * Matrix Projections
  99  */
 100 /*
 101  * http://www.terathon.com/lengyel/Lengyel-Oblique.pdf
 102  */
 103 static void plane_clip_projection( m4x4f mat, v4f plane )
 104 {
 105    v4f c =
 106    {
 107       (vg_signf(plane[0]) + mat[2][0]) / mat[0][0],
 108       (vg_signf(plane[1]) + mat[2][1]) / mat[1][1],
 109       -1.0f,
 110       (1.0f + mat[2][2]) / mat[3][2]
 111    };
 112
 113    v4_muls( plane, 2.0f / v4_dot(plane,c), c );
 114
 115    mat[0][2] = c[0];
 116    mat[1][2] = c[1];
 117    mat[2][2] = c[2] + 1.0f;
 118    mat[3][2] = c[3];
 119 }
 120
 121 static void pipeline_projection( m4x4f mat, float nearz, float farz )
 122 {
 123    m4x4_projection( mat,
 124          gpipeline.fov,
 125          (float)vg_window_x / (float)vg_window_y,
 126          nearz, farz );
 127 }
 128
 129 /*
 130  * Shaders
 131  */
 132 static void shader_link_standard_ub( GLuint shader, int texture_id )
 133 {
 134    GLuint idx = glGetUniformBlockIndex( shader, "ub_world_lighting" );
 135    glUniformBlockBinding( shader, idx, 0 );
 136
 137    glActiveTexture( GL_TEXTURE0 + texture_id );
 138    glBindTexture( GL_TEXTURE_2D, gpipeline.rgb_depthmap );
 139    glUniform1i( glGetUniformLocation( shader, "g_world_depth" ), texture_id );
 140 }
 141
 142 static void render_update_lighting_ub(void)
 143 {
 144    struct ub_world_lighting *winf = &gpipeline.ub_world_lighting;
 145    int c = 0;
 146
 147    for( int i=0; i<3; i++ )
 148    {
 149       struct light_widget *lw = &gpipeline.widgets[i];
 150
 151       if( lw->enabled )
 152       {
 153          float pitch = lw->dir[0],
 154                yaw = lw->dir[1],
 155                xz = cosf( pitch );
 156
 157          v3_copy( (v3f){ xz*cosf(yaw), sinf(pitch), xz*sinf(yaw) },
 158                winf->g_light_directions[c] );
 159          v3_copy( lw->colour, winf->g_light_colours[c] );
 160
 161          c ++;
 162       }
 163    }
 164
 165    winf->g_light_count = c;
 166    winf->g_light_directions[0][3] = gpipeline.shadow_length;
 167    winf->g_light_colours[0][3] = gpipeline.shadow_spread;
 168
 169    glBindBuffer( GL_UNIFORM_BUFFER, gpipeline.ubo_world_lighting );
 170    glBufferSubData( GL_UNIFORM_BUFFER, 0, sizeof(struct ub_world_lighting),
 171          &gpipeline.ub_world_lighting );
 172 }
 173
 174 /*
 175  * Framebuffers
 176  */
 177
 178 static void fb_use( struct framebuffer *fb )
 179 {
 180    if( !fb )
 181    {
 182       glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 183       glViewport( 0, 0, vg_window_x, vg_window_y );
 184    }
 185    else
 186    {
 187       glBindFramebuffer( GL_FRAMEBUFFER, fb->fb );
 188       glViewport( 0, 0, vg_window_x / fb->div, vg_window_y / fb->div );
 189    }
 190 }
 191
 192 static void fb_init( struct framebuffer *fb )
 193 {
 194    i32 ix = vg_window_x / fb->div,
 195        iy = vg_window_y / fb->div;
 196
 197    glGenFramebuffers( 1, &fb->fb );
 198    glBindFramebuffer( GL_FRAMEBUFFER, fb->fb );
 199
 200    glGenTextures( 1, &fb->colour );
 201    glBindTexture( GL_TEXTURE_2D, fb->colour );
 202    glTexImage2D( GL_TEXTURE_2D, 0, fb->format, ix, iy,
 203          0, fb->format, GL_UNSIGNED_BYTE, NULL);
 204
 205    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
 206    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 207    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 208          GL_TEXTURE_2D, fb->colour, 0);
 209
 210    glGenRenderbuffers( 1, &fb->rb );
 211    glBindRenderbuffer( GL_RENDERBUFFER, fb->rb );
 212    glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, ix, iy );
 213
 214    glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
 215          GL_RENDERBUFFER, fb->rb );
 216    glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 217
 218    VG_CHECK_GL_ERR();
 219    fb->allocated = 1;
 220 }
 221
 222 static void fb_free( struct framebuffer *fb )
 223 {
 224    glDeleteTextures( 1, &fb->colour );
 225    glDeleteFramebuffers( 1, &fb->fb );
 226 }
 227
 228 static void fb_bindtex( struct framebuffer *fb, int texture )
 229 {
 230    glActiveTexture( GL_TEXTURE0 + texture );
 231    glBindTexture( GL_TEXTURE_2D, fb->colour );
 232 }
 233
 234 static void fb_resize( struct framebuffer *fb )
 235 {
 236    if( !fb->allocated )
 237       return;
 238
 239    i32 ix = vg_window_x / fb->div,
 240        iy = vg_window_y / fb->div;
 241
 242    glBindTexture( GL_TEXTURE_2D, fb->colour );
 243    glTexImage2D( GL_TEXTURE_2D, 0, fb->format, ix, iy, 0,
 244          fb->format, GL_UNSIGNED_BYTE, NULL );
 245
 246    glBindRenderbuffer( GL_RENDERBUFFER, fb->rb );
 247    glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, ix, iy );
 248 }
 249
 250 static void render_fb_resize(void)
 251 {
 252    if( gpipeline.ready )
 253    {
 254       glBindTexture( GL_TEXTURE_2D, gpipeline.rgb_background );
 255       glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, vg_window_x, vg_window_y, 0,
 256             GL_RGB, GL_UNSIGNED_BYTE, NULL );
 257    }
 258 }
 259
 260 /* used for drawing player onto */
 261 static void render_init_temp_buffer(void)
 262 {
 263    vg_info( "[render] Allocate temporary framebuffer\n" );
 264
 265    glGenFramebuffers( 1, &gpipeline.fb_background );
 266    glBindFramebuffer( GL_FRAMEBUFFER, gpipeline.fb_background );
 267
 268    glGenTextures( 1, &gpipeline.rgb_background );
 269    glBindTexture( GL_TEXTURE_2D, gpipeline.rgb_background );
 270    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, vg_window_x, vg_window_y,
 271          0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
 272
 273    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
 274    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 275    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 276          GL_TEXTURE_2D,
 277          gpipeline.rgb_background, 0);
 278
 279    VG_CHECK_GL_ERR();
 280 }
 281
 282 /* used for drawing world depth from the top view, used in our water and
 283  * lighting calculations */
 284 static void render_init_depthmap_buffer(void)
 285 {
 286    vg_info( "[render] Allocate depth map buffer\n" );
 287
 288    glGenFramebuffers( 1, &gpipeline.fb_depthmap );
 289    glBindFramebuffer( GL_FRAMEBUFFER, gpipeline.fb_depthmap );
 290
 291    glGenTextures( 1, &gpipeline.rgb_depthmap );
 292    glBindTexture( GL_TEXTURE_2D, gpipeline.rgb_depthmap );
 293    glTexImage2D( GL_TEXTURE_2D, 0, GL_R32F, 1024, 1024, 0,
 294          GL_RED, GL_FLOAT, NULL );
 295    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
 296    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
 297    vg_tex2d_clamp();
 298
 299    glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
 300          GL_TEXTURE_2D,
 301          gpipeline.rgb_depthmap, 0);
 302
 303    VG_CHECK_GL_ERR();
 304 }
 305
 306 static void render_init_fs_quad(void)
 307 {
 308    vg_info( "[render] Allocate quad\n" );
 309
 310    float quad[] = { 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
 311                     0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f };
 312
 313    glGenVertexArrays( 1, &gpipeline.fsquad.vao );
 314    glGenBuffers( 1, &gpipeline.fsquad.vbo );
 315    glBindVertexArray( gpipeline.fsquad.vao );
 316    glBindBuffer( GL_ARRAY_BUFFER, gpipeline.fsquad.vbo );
 317    glBufferData( GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW );
 318    glBindVertexArray( gpipeline.fsquad.vao );
 319    glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE,
 320          sizeof(float)*2, (void*)0 );
 321    glEnableVertexAttribArray( 0 );
 322
 323    VG_CHECK_GL_ERR();
 324 }
 325
 326 static void render_init_uniform_buffers(void)
 327 {
 328    vg_info( "[render] Allocate uniform buffer\n" );
 329
 330    glGenBuffers( 1, &gpipeline.ubo_world_lighting );
 331    glBindBuffer( GL_UNIFORM_BUFFER, gpipeline.ubo_world_lighting );
 332    glBufferData( GL_UNIFORM_BUFFER, sizeof(struct ub_world_lighting),
 333          NULL, GL_DYNAMIC_DRAW );
 334
 335    render_update_lighting_ub();
 336    glBindBufferBase( GL_UNIFORM_BUFFER, 0, gpipeline.ubo_world_lighting );
 337
 338    VG_CHECK_GL_ERR();
 339 }
 340
 341 static void render_init(void)
 342 {
 343    shader_blit_register();
 344    shader_standard_register();
 345    shader_vblend_register();
 346    shader_unlit_register();
 347
 348    vg_acquire_thread_sync();
 349    {
 350       render_init_temp_buffer();
 351       render_init_depthmap_buffer();
 352       render_init_fs_quad();
 353       render_init_uniform_buffers();
 354
 355       glBindFramebuffer( GL_FRAMEBUFFER, 0 );
 356       gpipeline.ready = 1;
 357    }
 358
 359    vg_release_thread_sync();
 360 }
 361
 362 static void render_free(void *_)
 363 {
 364    glDeleteBuffers( 1, &gpipeline.ubo_world_lighting );
 365
 366    glDeleteVertexArrays( 1, &gpipeline.fsquad.vao );
 367    glDeleteBuffers( 1, &gpipeline.fsquad.vbo );
 368
 369    glDeleteFramebuffers( 1, &gpipeline.fb_depthmap );
 370    glDeleteTextures( 1, &gpipeline.rgb_depthmap );
 371
 372    glDeleteFramebuffers( 1, &gpipeline.fb_background );
 373    glDeleteTextures( 1, &gpipeline.rgb_background );
 374 }
 375
 376 /*
 377  * Utility
 378  */
 379 static void render_fsquad(void)
 380 {
 381    glBindVertexArray( gpipeline.fsquad.vao );
 382    glDrawArrays( GL_TRIANGLES, 0, 6 );
 383 }
 384
 385 #endif /* RENDER_H */