src/graphics/shader.cpp

   1 #include "AlphaSprite.hpp"
   2 #include "Canvas.hpp"
   3 #include "CreatureSkin.hpp"
   4 #include "PlanetSurface.hpp"
   5 #include "Program.hpp"
   6 #include "Shader.hpp"
   7 #include "SunSurface.hpp"
   8
   9 #include "ArrayTexture.hpp"
  10 #include "Texture.hpp"
  11 #include "../app/init.hpp"
  12
  13 #include <algorithm>
  14 #include <iostream>
  15 #include <memory>
  16 #include <ostream>
  17 #include <stdexcept>
  18 #include <string>
  19 #include <glm/gtc/type_ptr.hpp>
  20 #include <glm/gtx/transform.hpp>
  21
  22
  23 namespace {
  24
  25 void gl_error(std::string msg) {
  26         const GLubyte *errBegin = gluErrorString(glGetError());
  27         if (errBegin && *errBegin != '\0') {
  28                 const GLubyte *errEnd = errBegin;
  29                 while (*errEnd != '\0') {
  30                         ++errEnd;
  31                 }
  32                 msg += ": ";
  33                 msg.append(errBegin, errEnd);
  34         }
  35         throw std::runtime_error(msg);
  36 }
  37
  38 }
  39
  40 namespace blobs {
  41 namespace graphics {
  42
  43 Shader::Shader(GLenum type)
  44 : handle(glCreateShader(type)) {
  45         if (handle == 0) {
  46                 gl_error("glCreateShader");
  47         }
  48 }
  49
  50 Shader::~Shader() {
  51         if (handle != 0) {
  52                 glDeleteShader(handle);
  53         }
  54 }
  55
  56 Shader::Shader(Shader &&other) noexcept
  57 : handle(other.handle) {
  58         other.handle = 0;
  59 }
  60
  61 Shader &Shader::operator =(Shader &&other) noexcept {
  62         std::swap(handle, other.handle);
  63         return *this;
  64 }
  65
  66
  67 void Shader::Source(const GLchar *src) noexcept {
  68         const GLchar* src_arr[] = { src };
  69         glShaderSource(handle, 1, src_arr, nullptr);
  70 }
  71
  72 void Shader::Compile() noexcept {
  73         glCompileShader(handle);
  74 }
  75
  76 bool Shader::Compiled() const noexcept {
  77         GLint compiled = GL_FALSE;
  78         glGetShaderiv(handle, GL_COMPILE_STATUS, &compiled);
  79         return compiled == GL_TRUE;
  80 }
  81
  82 void Shader::Log(std::ostream &out) const {
  83         int log_len = 0, max_len = 0;
  84         glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &max_len);
  85         std::unique_ptr<char[]> log(new char[max_len]);
  86         glGetShaderInfoLog(handle, max_len, &log_len, log.get());
  87         out.write(log.get(), log_len);
  88 }
  89
  90
  91 void Shader::AttachToProgram(GLuint id) const noexcept {
  92         glAttachShader(id, handle);
  93 }
  94
  95
  96 Program::Program()
  97 : handle(glCreateProgram()) {
  98         if (handle == 0) {
  99                 gl_error("glCreateProgram");
 100         }
 101 }
 102
 103 Program::~Program() {
 104         if (handle != 0) {
 105                 glDeleteProgram(handle);
 106         }
 107 }
 108
 109
 110 const Shader &Program::LoadShader(GLenum type, const GLchar *src) {
 111         shaders.emplace_back(type);
 112         Shader &shader = shaders.back();
 113         shader.Source(src);
 114         shader.Compile();
 115         if (!shader.Compiled()) {
 116                 shader.Log(std::cerr);
 117                 throw std::runtime_error("compile shader");
 118         }
 119         Attach(shader);
 120         return shader;
 121 }
 122
 123 void Program::Attach(Shader &shader) noexcept {
 124         shader.AttachToProgram(handle);
 125 }
 126
 127 void Program::Link() noexcept {
 128         glLinkProgram(handle);
 129 }
 130
 131 bool Program::Linked() const noexcept {
 132         GLint linked = GL_FALSE;
 133         glGetProgramiv(handle, GL_LINK_STATUS, &linked);
 134         return linked == GL_TRUE;
 135 }
 136
 137 void Program::Log(std::ostream &out) const {
 138         int log_len = 0, max_len = 0;
 139         glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &max_len);
 140         std::unique_ptr<char[]> log(new char[max_len]);
 141         glGetProgramInfoLog(handle, max_len, &log_len, log.get());
 142         out.write(log.get(), log_len);
 143 }
 144
 145
 146 GLint Program::AttributeLocation(const GLchar *name) const noexcept {
 147         return glGetAttribLocation(handle, name);
 148 }
 149
 150 GLint Program::AttributeLocation(const std::string &name) const noexcept {
 151         return AttributeLocation(name.c_str());
 152 }
 153
 154 GLint Program::UniformLocation(const GLchar *name) const noexcept {
 155         return glGetUniformLocation(handle, name);
 156 }
 157
 158 GLint Program::UniformLocation(const std::string &name) const noexcept {
 159         return UniformLocation(name.c_str());
 160 }
 161
 162
 163 void Program::Uniform(GLint loc, GLint val) noexcept {
 164         glUniform1i(loc, val);
 165 }
 166
 167 void Program::Uniform(GLint loc, float val) noexcept {
 168         glUniform1f(loc, val);
 169 }
 170
 171 void Program::Uniform(GLint loc, const glm::vec3 &val) noexcept {
 172         glUniform3fv(loc, 1, glm::value_ptr(val));
 173 }
 174
 175 void Program::Uniform(GLint loc, const glm::vec4 &val) noexcept {
 176         glUniform4fv(loc, 1, glm::value_ptr(val));
 177 }
 178
 179 void Program::Uniform(GLint loc, const glm::mat4 &val) noexcept {
 180         glUniformMatrix4fv(loc, 1, GL_FALSE, glm::value_ptr(val));
 181 }
 182
 183
 184 constexpr int PlanetSurface::MAX_LIGHTS;
 185
 186 PlanetSurface::PlanetSurface()
 187 : prog() {
 188         prog.LoadShader(
 189                 GL_VERTEX_SHADER,
 190                 "#version 330 core\n"
 191
 192                 "layout(location = 0) in vec3 vtx_position;\n"
 193                 "layout(location = 1) in vec3 vtx_normal;\n"
 194                 "layout(location = 2) in vec3 vtx_tex_uv;\n"
 195
 196                 "uniform mat4 M;\n"
 197                 "uniform mat4 MV;\n"
 198                 "uniform mat4 MVP;\n"
 199
 200                 "out vec3 vtx_viewspace;\n"
 201                 "out vec3 nrm_viewspace;\n"
 202                 "out vec3 frag_tex_uv;\n"
 203
 204                 "void main() {\n"
 205                         "gl_Position = MVP * vec4(vtx_position, 1.0);\n"
 206                         "vtx_viewspace = (MV * vec4(vtx_position, 1.0)).xyz;\n"
 207                         "nrm_viewspace = (MV * vec4(vtx_position, 0.0)).xyz;\n"
 208                         "frag_tex_uv = vtx_tex_uv;\n"
 209                 "}\n"
 210         );
 211         prog.LoadShader(
 212                 GL_FRAGMENT_SHADER,
 213                 "#version 330 core\n"
 214
 215                 "struct LightSource {\n"
 216                         "vec3 position;\n"
 217                         "vec3 color;\n"
 218                         "float strength;\n"
 219                 "};\n"
 220
 221                 "in vec3 vtx_viewspace;\n"
 222                 "in vec3 nrm_viewspace;\n"
 223                 "in vec3 frag_tex_uv;\n"
 224
 225                 "uniform sampler2DArray tex_sampler;\n"
 226                 "uniform int num_lights;\n"
 227                 "uniform LightSource light[8];\n"
 228
 229                 "out vec3 color;\n"
 230
 231                 "void main() {\n"
 232                         "vec3 normal = normalize(nrm_viewspace);\n"
 233                         "vec3 tex_color = texture(tex_sampler, frag_tex_uv).rgb;\n"
 234                         "vec3 total_light = tex_color * vec3(0.1, 0.1, 0.1);\n"
 235                         "for (int i = 0; i < num_lights; ++i) {\n"
 236                                 "vec3 to_light = light[i].position - vtx_viewspace;\n"
 237                                 "float distance = length(to_light) + length(vtx_viewspace);\n"
 238                                 "vec3 light_dir = normalize(to_light);\n"
 239                                 "float attenuation = light[i].strength / (distance * distance);\n"
 240                                 "vec3 diffuse = attenuation * max(0.0, dot(normal, light_dir)) * light[i].color * tex_color;\n"
 241                                 "vec3 view_dir = vec3(0.0, 0.0, 1.0);\n"
 242                                 "vec3 specular = vec3(0.0, 0.0, 0.0);\n"
 243                                 "if (dot(normal, light_dir) >= 0.0) {\n"
 244                                         "attenuation * light[i].color * pow(max(0.0, dot(reflect(-light_dir, normal), view_dir)), 25.0);\n"
 245                                 "}\n"
 246                                 "total_light = total_light + diffuse + specular;\n"
 247                         "}\n"
 248                         "color = total_light;\n"
 249                 "}\n"
 250         );
 251         prog.Link();
 252         if (!prog.Linked()) {
 253                 prog.Log(std::cerr);
 254                 throw std::runtime_error("link program");
 255         }
 256         m_handle = prog.UniformLocation("M");
 257         mv_handle = prog.UniformLocation("MV");
 258         mvp_handle = prog.UniformLocation("MVP");
 259         sampler_handle = prog.UniformLocation("tex_sampler");
 260         num_lights_handle = prog.UniformLocation("num_lights");
 261         for (int i = 0; i < MAX_LIGHTS; ++i) {
 262                 light_handle[3 * i + 0]  = prog.UniformLocation("light[" + std::to_string(i) + "].position");
 263                 light_handle[3 * i + 1]  = prog.UniformLocation("light[" + std::to_string(i) + "].color");
 264                 light_handle[3 * i + 2]  = prog.UniformLocation("light[" + std::to_string(i) + "].strength");
 265         }
 266 }
 267
 268 PlanetSurface::~PlanetSurface() {
 269 }
 270
 271 void PlanetSurface::Activate() noexcept {
 272         prog.Use();
 273         glEnable(GL_DEPTH_TEST);
 274         glDepthFunc(GL_LESS);
 275         glEnable(GL_CULL_FACE);
 276         glDisable(GL_BLEND);
 277 }
 278
 279 void PlanetSurface::SetM(const glm::mat4 &mm) noexcept {
 280         m = mm;
 281         mv = v * m;
 282         mvp = p * mv;
 283         prog.Uniform(m_handle, m);
 284         prog.Uniform(mv_handle, mv);
 285         prog.Uniform(mvp_handle, mvp);
 286 }
 287
 288 void PlanetSurface::SetV(const glm::mat4 &vv) noexcept {
 289         v = vv;
 290         mv = v * m;
 291         mvp = p * mv;
 292         prog.Uniform(mv_handle, mv);
 293         prog.Uniform(mvp_handle, mvp);
 294 }
 295
 296 void PlanetSurface::SetVP(const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 297         v = vv;
 298         p = pp;
 299         mv = v * m;
 300         mvp = p * mv;
 301         prog.Uniform(mv_handle, mv);
 302         prog.Uniform(mvp_handle, mvp);
 303 }
 304
 305 void PlanetSurface::SetMVP(const glm::mat4 &mm, const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 306         m = mm;
 307         v = vv;
 308         p = pp;
 309         mv = v * m;
 310         mvp = p * mv;
 311         prog.Uniform(m_handle, m);
 312         prog.Uniform(mv_handle, mv);
 313         prog.Uniform(mvp_handle, mvp);
 314 }
 315
 316 void PlanetSurface::SetTexture(ArrayTexture &tex) noexcept {
 317         glActiveTexture(GL_TEXTURE0);
 318         tex.Bind();
 319         prog.Uniform(sampler_handle, GLint(0));
 320 }
 321
 322 void PlanetSurface::SetLight(int n, const glm::vec3 &pos, const glm::vec3 &color, float strength) noexcept {
 323         prog.Uniform(light_handle[3 * n + 0], pos);
 324         prog.Uniform(light_handle[3 * n + 1], color);
 325         prog.Uniform(light_handle[3 * n + 2], strength);
 326 }
 327
 328 void PlanetSurface::SetNumLights(int n) noexcept {
 329         prog.Uniform(num_lights_handle, std::min(MAX_LIGHTS, n));
 330 }
 331
 332
 333 SunSurface::SunSurface()
 334 : prog() {
 335         prog.LoadShader(
 336                 GL_VERTEX_SHADER,
 337                 "#version 330 core\n"
 338
 339                 "layout(location = 0) in vec3 vtx_position;\n"
 340
 341                 "uniform mat4 M;\n"
 342                 "uniform mat4 MV;\n"
 343                 "uniform mat4 MVP;\n"
 344
 345                 "out vec3 vtx_viewspace;\n"
 346
 347                 "void main() {\n"
 348                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 349                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 350                 "}\n"
 351         );
 352         prog.LoadShader(
 353                 GL_FRAGMENT_SHADER,
 354                 "#version 330 core\n"
 355
 356                 "in vec3 vtx_viewspace;\n"
 357
 358                 "uniform vec3 light_color;\n"
 359                 "uniform float light_strength;\n"
 360
 361                 "out vec3 color;\n"
 362
 363                 "void main() {\n"
 364                         "vec3 to_light = -vtx_viewspace;\n"
 365                         "float distance = length(to_light);\n"
 366                         //"vec3 light_dir = normalize(to_light);\n"
 367                         "float attenuation = light_strength / (distance * distance);\n"
 368                         "color = attenuation * light_color;\n"
 369                 "}\n"
 370         );
 371         prog.Link();
 372         if (!prog.Linked()) {
 373                 prog.Log(std::cerr);
 374                 throw std::runtime_error("link program");
 375         }
 376         m_handle = prog.UniformLocation("M");
 377         mv_handle = prog.UniformLocation("MV");
 378         mvp_handle = prog.UniformLocation("MVP");
 379         light_color_handle = prog.UniformLocation("light_color");
 380         light_strength_handle = prog.UniformLocation("light_strength");
 381
 382         vao.Bind();
 383         vao.BindAttributes();
 384         vao.EnableAttribute(0);
 385         vao.AttributePointer<glm::vec3>(0, false, offsetof(Attributes, position));
 386         vao.ReserveAttributes(8, GL_STATIC_DRAW);
 387         {
 388                 auto attrib = vao.MapAttributes(GL_WRITE_ONLY);
 389                 attrib[0].position = glm::vec3(-1.0f, -1.0f, -1.0f);
 390                 attrib[1].position = glm::vec3(-1.0f, -1.0f,  1.0f);
 391                 attrib[2].position = glm::vec3(-1.0f,  1.0f, -1.0f);
 392                 attrib[3].position = glm::vec3(-1.0f,  1.0f,  1.0f);
 393                 attrib[4].position = glm::vec3( 1.0f, -1.0f, -1.0f);
 394                 attrib[5].position = glm::vec3( 1.0f, -1.0f,  1.0f);
 395                 attrib[6].position = glm::vec3( 1.0f,  1.0f, -1.0f);
 396                 attrib[7].position = glm::vec3( 1.0f,  1.0f,  1.0f);
 397         }
 398         vao.BindElements();
 399         vao.ReserveElements(36, GL_STATIC_DRAW);
 400         {
 401                 auto element = vao.MapElements(GL_WRITE_ONLY);
 402                 // -X
 403                 element[ 0] = 0;
 404                 element[ 1] = 1;
 405                 element[ 2] = 2;
 406                 element[ 3] = 2;
 407                 element[ 4] = 1;
 408                 element[ 5] = 3;
 409                 // -Y
 410                 element[ 6] = 0;
 411                 element[ 7] = 4;
 412                 element[ 8] = 1;
 413                 element[ 9] = 1;
 414                 element[10] = 4;
 415                 element[11] = 5;
 416                 // -Z
 417                 element[12] = 0;
 418                 element[13] = 2;
 419                 element[14] = 4;
 420                 element[15] = 4;
 421                 element[16] = 2;
 422                 element[17] = 6;
 423                 // +Z
 424                 element[18] = 1;
 425                 element[19] = 5;
 426                 element[20] = 3;
 427                 element[21] = 3;
 428                 element[22] = 5;
 429                 element[23] = 7;
 430                 // +Y
 431                 element[24] = 3;
 432                 element[25] = 7;
 433                 element[26] = 2;
 434                 element[27] = 2;
 435                 element[28] = 7;
 436                 element[29] = 6;
 437                 // +X
 438                 element[30] = 5;
 439                 element[31] = 4;
 440                 element[32] = 7;
 441                 element[33] = 7;
 442                 element[34] = 4;
 443                 element[35] = 6;
 444         }
 445         vao.Unbind();
 446 }
 447
 448 SunSurface::~SunSurface() {
 449 }
 450
 451 void SunSurface::Activate() noexcept {
 452         prog.Use();
 453         glEnable(GL_DEPTH_TEST);
 454         glDepthFunc(GL_LESS);
 455         glEnable(GL_CULL_FACE);
 456         glDisable(GL_BLEND);
 457 }
 458
 459 void SunSurface::SetM(const glm::mat4 &mm) noexcept {
 460         m = mm;
 461         mv = v * m;
 462         mvp = p * mv;
 463         prog.Uniform(m_handle, m);
 464         prog.Uniform(mv_handle, mv);
 465         prog.Uniform(mvp_handle, mvp);
 466 }
 467
 468 void SunSurface::SetV(const glm::mat4 &vv) noexcept {
 469         v = vv;
 470         mv = v * m;
 471         mvp = p * mv;
 472         prog.Uniform(mv_handle, mv);
 473         prog.Uniform(mvp_handle, mvp);
 474 }
 475
 476 void SunSurface::SetVP(const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 477         v = vv;
 478         p = pp;
 479         mv = v * m;
 480         mvp = p * mv;
 481         prog.Uniform(mv_handle, mv);
 482         prog.Uniform(mvp_handle, mvp);
 483 }
 484
 485 void SunSurface::SetMVP(const glm::mat4 &mm, const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 486         m = mm;
 487         v = vv;
 488         p = pp;
 489         mv = v * m;
 490         mvp = p * mv;
 491         prog.Uniform(m_handle, m);
 492         prog.Uniform(mv_handle, mv);
 493         prog.Uniform(mvp_handle, mvp);
 494 }
 495
 496 void SunSurface::SetLight(const glm::vec3 &color, float strength) noexcept {
 497         prog.Uniform(light_color_handle, color);
 498         prog.Uniform(light_strength_handle, strength);
 499 }
 500
 501 void SunSurface::Draw() const noexcept {
 502         vao.Bind();
 503         vao.DrawTriangles(36);
 504 }
 505
 506
 507 constexpr int CreatureSkin::MAX_LIGHTS;
 508
 509 CreatureSkin::CreatureSkin()
 510 : prog() {
 511         prog.LoadShader(
 512                 GL_VERTEX_SHADER,
 513                 "#version 330 core\n"
 514
 515                 "layout(location = 0) in vec3 vtx_position;\n"
 516                 "layout(location = 1) in vec3 vtx_normal;\n"
 517                 "layout(location = 2) in vec3 vtx_tex_uv;\n"
 518
 519                 "uniform mat4 M;\n"
 520                 "uniform mat4 MV;\n"
 521                 "uniform mat4 MVP;\n"
 522
 523                 "out vec3 vtx_viewspace;\n"
 524                 "out vec3 frag_tex_uv;\n"
 525                 "out vec3 normal;\n"
 526
 527                 "void main() {\n"
 528                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 529                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 530                         "normal = normalize((MV * vec4(vtx_normal, 0)).xyz);\n"
 531                         "frag_tex_uv = vtx_tex_uv;\n"
 532                 "}\n"
 533         );
 534         prog.LoadShader(
 535                 GL_FRAGMENT_SHADER,
 536                 "#version 330 core\n"
 537
 538                 "struct LightSource {\n"
 539                         "vec3 position;\n"
 540                         "vec3 color;\n"
 541                         "float strength;\n"
 542                 "};\n"
 543
 544                 "in vec3 vtx_viewspace;\n"
 545                 "in vec3 frag_tex_uv;\n"
 546                 "in vec3 normal;\n"
 547
 548                 "uniform vec3 base_color;\n"
 549                 "uniform vec4 highlight_color;\n"
 550                 "uniform sampler2DArray tex_sampler;\n"
 551                 "uniform int num_lights;\n"
 552                 "uniform LightSource light[8];\n"
 553
 554                 "out vec3 color;\n"
 555
 556                 "void main() {\n"
 557                         "vec4 tex_color = texture(tex_sampler, frag_tex_uv);\n"
 558                         "vec3 mat_color = mix(base_color, highlight_color.rgb, tex_color.r * tex_color.a * highlight_color.a);\n"
 559                         "vec3 total_light = mat_color * vec3(0.1, 0.1, 0.1);\n"
 560                         "for (int i = 0; i < num_lights; ++i) {\n"
 561                                 "vec3 to_light = light[i].position - vtx_viewspace;\n"
 562                                 "float distance = length(to_light) + length(vtx_viewspace);\n"
 563                                 "vec3 light_dir = normalize(to_light);\n"
 564                                 "float attenuation = light[i].strength / (distance * distance);\n"
 565                                 "vec3 diffuse = attenuation * max(0.0, dot(normal, light_dir)) * light[i].color * mat_color;\n"
 566                                 "vec3 view_dir = vec3(0.0, 0.0, 1.0);\n"
 567                                 "vec3 specular = vec3(0.0, 0.0, 0.0);\n"
 568                                 "if (dot(normal, light_dir) >= 0.0) {\n"
 569                                         "attenuation * light[i].color * pow(max(0.0, dot(reflect(-light_dir, normal), view_dir)), 25.0);\n"
 570                                 "}\n"
 571                                 "total_light = total_light + diffuse + specular;\n"
 572                         "}\n"
 573                         "color = total_light;\n"
 574                 "}\n"
 575         );
 576         prog.Link();
 577         if (!prog.Linked()) {
 578                 prog.Log(std::cerr);
 579                 throw std::runtime_error("link program");
 580         }
 581         m_handle = prog.UniformLocation("M");
 582         mv_handle = prog.UniformLocation("MV");
 583         mvp_handle = prog.UniformLocation("MVP");
 584         base_color_handle = prog.UniformLocation("base_color");
 585         highlight_color_handle = prog.UniformLocation("highlight_color");
 586         sampler_handle = prog.UniformLocation("tex_sampler");
 587         num_lights_handle = prog.UniformLocation("num_lights");
 588         for (int i = 0; i < MAX_LIGHTS; ++i) {
 589                 light_handle[3 * i + 0]  = prog.UniformLocation("light[" + std::to_string(i) + "].position");
 590                 light_handle[3 * i + 1]  = prog.UniformLocation("light[" + std::to_string(i) + "].color");
 591                 light_handle[3 * i + 2]  = prog.UniformLocation("light[" + std::to_string(i) + "].strength");
 592         }
 593 }
 594
 595 CreatureSkin::~CreatureSkin() {
 596 }
 597
 598 void CreatureSkin::Activate() noexcept {
 599         prog.Use();
 600         glEnable(GL_DEPTH_TEST);
 601         glDepthFunc(GL_LESS);
 602         glEnable(GL_CULL_FACE);
 603         glDisable(GL_BLEND);
 604 }
 605
 606 void CreatureSkin::SetM(const glm::mat4 &mm) noexcept {
 607         m = mm;
 608         mv = v * m;
 609         mvp = p * mv;
 610         prog.Uniform(m_handle, m);
 611         prog.Uniform(mv_handle, mv);
 612         prog.Uniform(mvp_handle, mvp);
 613 }
 614
 615 void CreatureSkin::SetV(const glm::mat4 &vv) noexcept {
 616         v = vv;
 617         mv = v * m;
 618         mvp = p * mv;
 619         prog.Uniform(mv_handle, mv);
 620         prog.Uniform(mvp_handle, mvp);
 621 }
 622
 623 void CreatureSkin::SetVP(const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 624         v = vv;
 625         p = pp;
 626         mv = v * m;
 627         mvp = p * mv;
 628         prog.Uniform(mv_handle, mv);
 629         prog.Uniform(mvp_handle, mvp);
 630 }
 631
 632 void CreatureSkin::SetMVP(const glm::mat4 &mm, const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 633         m = mm;
 634         v = vv;
 635         p = pp;
 636         mv = v * m;
 637         mvp = p * mv;
 638         prog.Uniform(m_handle, m);
 639         prog.Uniform(mv_handle, mv);
 640         prog.Uniform(mvp_handle, mvp);
 641 }
 642
 643 void CreatureSkin::SetBaseColor(const glm::vec3 &c) noexcept {
 644         prog.Uniform(base_color_handle, c);
 645 }
 646
 647 void CreatureSkin::SetHighlightColor(const glm::vec4 &c) noexcept {
 648         prog.Uniform(highlight_color_handle, c);
 649 }
 650
 651 void CreatureSkin::SetTexture(ArrayTexture &tex) noexcept {
 652         glActiveTexture(GL_TEXTURE0);
 653         tex.Bind();
 654         prog.Uniform(sampler_handle, GLint(0));
 655 }
 656
 657 void CreatureSkin::SetLight(int n, const glm::vec3 &pos, const glm::vec3 &color, float strength) noexcept {
 658         prog.Uniform(light_handle[3 * n + 0], pos);
 659         prog.Uniform(light_handle[3 * n + 1], color);
 660         prog.Uniform(light_handle[3 * n + 2], strength);
 661 }
 662
 663 void CreatureSkin::SetNumLights(int n) noexcept {
 664         prog.Uniform(num_lights_handle, std::min(MAX_LIGHTS, n));
 665 }
 666
 667
 668 AlphaSprite::AlphaSprite()
 669 : prog() {
 670         prog.LoadShader(
 671                 GL_VERTEX_SHADER,
 672                 "#version 330 core\n"
 673
 674                 "layout(location = 0) in vec3 vtx_position;\n"
 675                 "layout(location = 1) in vec2 vtx_texture;\n"
 676
 677                 "uniform mat4 M;\n"
 678                 "uniform mat4 MV;\n"
 679                 "uniform mat4 MVP;\n"
 680
 681                 "out vec2 frag_tex_uv;\n"
 682
 683                 "void main() {\n"
 684                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 685                         "frag_tex_uv = vtx_texture;\n"
 686                 "}\n"
 687         );
 688         prog.LoadShader(
 689                 GL_FRAGMENT_SHADER,
 690                 "#version 330 core\n"
 691
 692                 "in vec2 frag_tex_uv;\n"
 693
 694                 "uniform sampler2D tex_sampler;\n"
 695                 "uniform vec4 fg_color;\n"
 696                 "uniform vec4 bg_color;\n"
 697
 698                 "out vec4 color;\n"
 699
 700                 "void main() {\n"
 701                         "vec4 tex_color = texture(tex_sampler, frag_tex_uv);\n"
 702                         "vec4 factor = mix(bg_color, fg_color, tex_color.a);\n"
 703                         "color = vec4((tex_color * factor).rgb, factor.a);\n"
 704                 "}\n"
 705         );
 706         prog.Link();
 707         if (!prog.Linked()) {
 708                 prog.Log(std::cerr);
 709                 throw std::runtime_error("link program");
 710         }
 711         m_handle = prog.UniformLocation("M");
 712         mv_handle = prog.UniformLocation("MV");
 713         mvp_handle = prog.UniformLocation("MVP");
 714         sampler_handle = prog.UniformLocation("tex_sampler");
 715         fg_color_handle = prog.UniformLocation("fg_color");
 716         bg_color_handle = prog.UniformLocation("bg_color");
 717
 718         vao.Bind();
 719         vao.BindAttributes();
 720         vao.EnableAttribute(0);
 721         vao.EnableAttribute(1);
 722         vao.AttributePointer<glm::vec3>(0, false, offsetof(Attributes, position));
 723         vao.AttributePointer<glm::vec2>(1, false, offsetof(Attributes, texture));
 724         vao.ReserveAttributes(4, GL_STATIC_DRAW);
 725         {
 726                 auto attrib = vao.MapAttributes(GL_WRITE_ONLY);
 727                 attrib[0].position = glm::vec3(-0.5f, -0.5f, 0.0f);
 728                 attrib[0].texture = glm::vec2(0.0f, 0.0f);
 729                 attrib[1].position = glm::vec3(-0.5f,  0.5f, 0.0f);
 730                 attrib[1].texture = glm::vec2(0.0f, 1.0f);
 731                 attrib[2].position = glm::vec3( 0.5f, -0.5f, 0.0f);
 732                 attrib[2].texture = glm::vec2(1.0f, 0.0f);
 733                 attrib[3].position = glm::vec3( 0.5f,  0.5f, 0.0f);
 734                 attrib[3].texture = glm::vec2(1.0f, 1.0f);
 735         }
 736         vao.BindElements();
 737         vao.ReserveElements(7, GL_STATIC_DRAW);
 738         {
 739                 auto element = vao.MapElements(GL_WRITE_ONLY);
 740                 element[ 0] = 0;
 741                 element[ 1] = 1;
 742                 element[ 2] = 2;
 743                 element[ 3] = 3;
 744         }
 745         vao.Unbind();
 746 }
 747
 748 AlphaSprite::~AlphaSprite() {
 749 }
 750
 751 void AlphaSprite::Activate() noexcept {
 752         prog.Use();
 753         glEnable(GL_DEPTH_TEST);
 754         glDepthFunc(GL_LESS);
 755         glEnable(GL_CULL_FACE);
 756         glEnable(GL_BLEND);
 757         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 758 }
 759
 760 void AlphaSprite::SetM(const glm::mat4 &mm) noexcept {
 761         m = mm;
 762         mv = v * m;
 763         mvp = p * mv;
 764         prog.Uniform(m_handle, m);
 765         prog.Uniform(mv_handle, mv);
 766         prog.Uniform(mvp_handle, mvp);
 767 }
 768
 769 void AlphaSprite::SetVP(const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 770         v = vv;
 771         p = pp;
 772         mv = v * m;
 773         mvp = p * mv;
 774         prog.Uniform(mv_handle, mv);
 775         prog.Uniform(mvp_handle, mvp);
 776 }
 777
 778 void AlphaSprite::SetMVP(const glm::mat4 &mm, const glm::mat4 &vv, const glm::mat4 &pp) noexcept {
 779         m = mm;
 780         v = vv;
 781         p = pp;
 782         mv = v * m;
 783         mvp = p * mv;
 784         prog.Uniform(m_handle, m);
 785         prog.Uniform(mv_handle, mv);
 786         prog.Uniform(mvp_handle, mvp);
 787 }
 788
 789 void AlphaSprite::SetTexture(Texture &tex) noexcept {
 790         glActiveTexture(GL_TEXTURE0);
 791         tex.Bind();
 792         prog.Uniform(sampler_handle, GLint(0));
 793 }
 794
 795 void AlphaSprite::SetFgColor(const glm::vec4 &color) noexcept {
 796         prog.Uniform(fg_color_handle, color);
 797 }
 798
 799 void AlphaSprite::SetBgColor(const glm::vec4 &color) noexcept {
 800         prog.Uniform(bg_color_handle, color);
 801 }
 802
 803 void AlphaSprite::DrawRect() const noexcept {
 804         vao.Bind();
 805         vao.DrawTriangleStrip(4);
 806 }
 807
 808
 809 Canvas::Canvas()
 810 : prog()
 811 , vao() {
 812         prog.LoadShader(
 813                 GL_VERTEX_SHADER,
 814                 "#version 330 core\n"
 815
 816                 "layout(location = 0) in vec2 vtx_position;\n"
 817
 818                 "uniform mat4 P;\n"
 819                 "uniform float z;\n"
 820
 821                 "void main() {\n"
 822                         // disamond rule adjust
 823                         //"vec3 position = vtx_position + vec3(0.5, 0.5, 0.0);\n"
 824                         "gl_Position = P * vec4(vtx_position, z, 1);\n"
 825                 "}\n"
 826         );
 827         prog.LoadShader(
 828                 GL_FRAGMENT_SHADER,
 829                 "#version 330 core\n"
 830
 831                 "uniform vec4 c;\n"
 832
 833                 "out vec4 color;\n"
 834
 835                 "void main() {\n"
 836                         "color = c;\n"
 837                 "}\n"
 838         );
 839         prog.Link();
 840         if (!prog.Linked()) {
 841                 prog.Log(std::cerr);
 842                 throw std::runtime_error("link program");
 843         }
 844         p_handle = prog.UniformLocation("P");
 845         z_handle = prog.UniformLocation("z");
 846         c_handle = prog.UniformLocation("c");
 847
 848         vao.Bind();
 849         vao.BindAttributes();
 850         vao.EnableAttribute(0);
 851         vao.AttributePointer<glm::vec2>(0, false, offsetof(Attributes, position));
 852         vao.ReserveAttributes(255, GL_DYNAMIC_DRAW);
 853         vao.BindElements();
 854         vao.ReserveElements(255, GL_DYNAMIC_DRAW);
 855         vao.Unbind();
 856 }
 857
 858 Canvas::~Canvas() {
 859 }
 860
 861 void Canvas::Resize(float w, float h) noexcept {
 862         prog.Uniform(p_handle, glm::ortho(0.0f, w, h, 0.0f, 1.0e4f, -1.0e4f));
 863 }
 864
 865 void Canvas::ZIndex(float z) noexcept {
 866         prog.Uniform(z_handle, -z);
 867 }
 868
 869 void Canvas::SetColor(const glm::vec4 &color) noexcept {
 870         prog.Uniform(c_handle, color);
 871 }
 872
 873 void Canvas::Activate() noexcept {
 874         prog.Use();
 875         glEnable(GL_DEPTH_TEST);
 876         glDepthFunc(GL_LESS);
 877         glEnable(GL_CULL_FACE);
 878         glEnable(GL_BLEND);
 879         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 880 }
 881
 882 void Canvas::DrawLine(const glm::vec2 &p1, const glm::vec2 &p2, float width) {
 883         glm::vec2 d = glm::normalize(p2 - p1) * (width * 0.5f);
 884         glm::vec2 n = glm::vec2(d.y, -d.x);
 885         vao.Bind();
 886         vao.BindAttributes();
 887         {
 888                 auto attr = vao.MapAttributes(GL_WRITE_ONLY);
 889                 attr[0].position = p1 - d + n;
 890                 attr[1].position = p1 - d - n;
 891                 attr[2].position = p2 + d + n;
 892                 attr[3].position = p2 + d - n;
 893         }
 894         vao.BindElements();
 895         {
 896                 auto elem = vao.MapElements(GL_WRITE_ONLY);
 897                 elem[0] = 0;
 898                 elem[1] = 1;
 899                 elem[2] = 2;
 900                 elem[3] = 3;
 901         }
 902         vao.DrawTriangleStrip(4);
 903         vao.Unbind();
 904 }
 905
 906 void Canvas::DrawRect(const glm::vec2 &p1, const glm::vec2 &p2, float width) {
 907         glm::vec2 min(std::min(p1.x, p2.x), std::min(p1.y, p2.y));
 908         glm::vec2 max(std::max(p1.x, p2.x), std::max(p1.y, p2.y));
 909         glm::vec2 dg1(min.x, max.y);
 910         glm::vec2 dg2(max.x, min.y);
 911         glm::vec2 d(width * 0.5f, width * 0.5f);
 912         glm::vec2 n(d.y, -d.x);
 913         vao.Bind();
 914         vao.BindAttributes();
 915         {
 916                 auto attr = vao.MapAttributes(GL_WRITE_ONLY);
 917                 attr[0].position = min + d;
 918                 attr[1].position = min - d;
 919                 attr[2].position = dg1 + n;
 920                 attr[3].position = dg1 - n;
 921                 attr[4].position = max - d;
 922                 attr[5].position = max + d;
 923                 attr[6].position = dg2 - n;
 924                 attr[7].position = dg2 + n;
 925         }
 926         vao.BindElements();
 927         {
 928                 auto elem = vao.MapElements(GL_WRITE_ONLY);
 929                 elem[0] = 0;
 930                 elem[1] = 1;
 931                 elem[2] = 2;
 932                 elem[3] = 3;
 933                 elem[4] = 4;
 934                 elem[5] = 5;
 935                 elem[6] = 6;
 936                 elem[7] = 7;
 937                 elem[8] = 0;
 938                 elem[9] = 1;
 939         }
 940         vao.DrawTriangleStrip(10);
 941         vao.Unbind();
 942 }
 943
 944 void Canvas::FillRect(const glm::vec2 &p1, const glm::vec2 &p2) {
 945         glm::vec2 min(std::min(p1.x, p2.x), std::min(p1.y, p2.y));
 946         glm::vec2 max(std::max(p1.x, p2.x), std::max(p1.y, p2.y));
 947         glm::vec2 dg1(min.x, max.y);
 948         glm::vec2 dg2(max.x, min.y);
 949         vao.Bind();
 950         vao.BindAttributes();
 951         {
 952                 auto attr = vao.MapAttributes(GL_WRITE_ONLY);
 953                 attr[0].position = min;
 954                 attr[1].position = dg1;
 955                 attr[2].position = dg2;
 956                 attr[3].position = max;
 957         }
 958         vao.BindElements();
 959         {
 960                 auto elem = vao.MapElements(GL_WRITE_ONLY);
 961                 elem[0] = 0;
 962                 elem[1] = 1;
 963                 elem[2] = 2;
 964                 elem[3] = 3;
 965         }
 966         vao.DrawTriangleStrip(4);
 967         vao.Unbind();
 968 }
 969
 970 }
 971 }