src/graphics/shader.cpp

   1 #include "BlendedSprite.hpp"
   2 #include "BlockLighting.hpp"
   3 #include "DirectionalLighting.hpp"
   4 #include "PlainColor.hpp"
   5 #include "Program.hpp"
   6 #include "Shader.hpp"
   7 #include "SkyBoxShader.hpp"
   8
   9 #include "ArrayTexture.hpp"
  10 #include "CubeMap.hpp"
  11 #include "Texture.hpp"
  12 #include "../app/init.hpp"
  13
  14 #include <algorithm>
  15 #include <iostream>
  16 #include <memory>
  17 #include <ostream>
  18 #include <stdexcept>
  19 #include <string>
  20 #include <glm/gtc/type_ptr.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 blank {
  41
  42 Shader::Shader(GLenum type)
  43 : handle(glCreateShader(type)) {
  44         if (handle == 0) {
  45                 gl_error("glCreateShader");
  46         }
  47 }
  48
  49 Shader::~Shader() {
  50         if (handle != 0) {
  51                 glDeleteShader(handle);
  52         }
  53 }
  54
  55 Shader::Shader(Shader &&other) noexcept
  56 : handle(other.handle) {
  57         other.handle = 0;
  58 }
  59
  60 Shader &Shader::operator =(Shader &&other) noexcept {
  61         std::swap(handle, other.handle);
  62         return *this;
  63 }
  64
  65
  66 void Shader::Source(const GLchar *src) noexcept {
  67         const GLchar* src_arr[] = { src };
  68         glShaderSource(handle, 1, src_arr, nullptr);
  69 }
  70
  71 void Shader::Compile() noexcept {
  72         glCompileShader(handle);
  73 }
  74
  75 bool Shader::Compiled() const noexcept {
  76         GLint compiled = GL_FALSE;
  77         glGetShaderiv(handle, GL_COMPILE_STATUS, &compiled);
  78         return compiled == GL_TRUE;
  79 }
  80
  81 void Shader::Log(std::ostream &out) const {
  82         int log_len = 0, max_len = 0;
  83         glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &max_len);
  84         std::unique_ptr<char[]> log(new char[max_len]);
  85         glGetShaderInfoLog(handle, max_len, &log_len, log.get());
  86         out.write(log.get(), log_len);
  87 }
  88
  89
  90 void Shader::AttachToProgram(GLuint id) const noexcept {
  91         glAttachShader(id, handle);
  92 }
  93
  94
  95 Program::Program()
  96 : handle(glCreateProgram()) {
  97         if (handle == 0) {
  98                 gl_error("glCreateProgram");
  99         }
 100 }
 101
 102 Program::~Program() {
 103         if (handle != 0) {
 104                 glDeleteProgram(handle);
 105         }
 106 }
 107
 108
 109 const Shader &Program::LoadShader(GLenum type, const GLchar *src) {
 110         shaders.emplace_back(type);
 111         Shader &shader = shaders.back();
 112         shader.Source(src);
 113         shader.Compile();
 114         if (!shader.Compiled()) {
 115                 shader.Log(std::cerr);
 116                 throw std::runtime_error("compile shader");
 117         }
 118         Attach(shader);
 119         return shader;
 120 }
 121
 122 void Program::Attach(Shader &shader) noexcept {
 123         shader.AttachToProgram(handle);
 124 }
 125
 126 void Program::Link() noexcept {
 127         glLinkProgram(handle);
 128 }
 129
 130 bool Program::Linked() const noexcept {
 131         GLint linked = GL_FALSE;
 132         glGetProgramiv(handle, GL_LINK_STATUS, &linked);
 133         return linked == GL_TRUE;
 134 }
 135
 136 void Program::Log(std::ostream &out) const {
 137         int log_len = 0, max_len = 0;
 138         glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &max_len);
 139         std::unique_ptr<char[]> log(new char[max_len]);
 140         glGetProgramInfoLog(handle, max_len, &log_len, log.get());
 141         out.write(log.get(), log_len);
 142 }
 143
 144
 145 GLint Program::AttributeLocation(const GLchar *name) const noexcept {
 146         return glGetAttribLocation(handle, name);
 147 }
 148
 149 GLint Program::UniformLocation(const GLchar *name) const noexcept {
 150         return glGetUniformLocation(handle, name);
 151 }
 152
 153
 154 void Program::Uniform(GLint loc, GLint val) noexcept {
 155         glUniform1i(loc, val);
 156 }
 157
 158 void Program::Uniform(GLint loc, float val) noexcept {
 159         glUniform1f(loc, val);
 160 }
 161
 162 void Program::Uniform(GLint loc, const glm::vec3 &val) noexcept {
 163         glUniform3fv(loc, 1, glm::value_ptr(val));
 164 }
 165
 166 void Program::Uniform(GLint loc, const glm::vec4 &val) noexcept {
 167         glUniform4fv(loc, 1, glm::value_ptr(val));
 168 }
 169
 170 void Program::Uniform(GLint loc, const glm::mat4 &val) noexcept {
 171         glUniformMatrix4fv(loc, 1, GL_FALSE, glm::value_ptr(val));
 172 }
 173
 174
 175 DirectionalLighting::DirectionalLighting()
 176 : program()
 177 , vp(1.0f)
 178 , m_handle(0)
 179 , mv_handle(0)
 180 , mvp_handle(0)
 181 , light_direction_handle(0)
 182 , light_color_handle(0)
 183 , ambient_color_handle(0)
 184 , fog_density_handle(0) {
 185         program.LoadShader(
 186                 GL_VERTEX_SHADER,
 187                 "#version 330 core\n"
 188                 "layout(location = 0) in vec3 vtx_position;\n"
 189                 "layout(location = 1) in vec3 vtx_tex_uv;\n"
 190                 "layout(location = 2) in vec3 vtx_hsl_mod;\n"
 191                 "layout(location = 3) in vec3 vtx_rgb_mod;\n"
 192                 "layout(location = 4) in vec3 vtx_normal;\n"
 193                 "uniform mat4 M;\n"
 194                 "uniform mat4 MV;\n"
 195                 "uniform mat4 MVP;\n"
 196                 "out vec3 frag_tex_uv;\n"
 197                 "out vec3 frag_hsl_mod;\n"
 198                 "out vec3 frag_rgb_mod;\n"
 199                 "out vec3 vtx_viewspace;\n"
 200                 "out vec3 normal;\n"
 201                 "void main() {\n"
 202                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 203                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 204                         "normal = (M * vec4(vtx_normal, 0)).xyz;\n"
 205                         "frag_tex_uv = vtx_tex_uv;\n"
 206                         "frag_hsl_mod = vtx_hsl_mod;\n"
 207                         "frag_rgb_mod = vtx_rgb_mod;\n"
 208                 "}\n"
 209         );
 210         program.LoadShader(
 211                 GL_FRAGMENT_SHADER,
 212                 "#version 330 core\n"
 213                 "in vec3 frag_tex_uv;\n"
 214                 "in vec3 frag_hsl_mod;\n"
 215                 "in vec3 frag_rgb_mod;\n"
 216                 "in vec3 vtx_viewspace;\n"
 217                 "in vec3 normal;\n"
 218                 "uniform sampler2DArray tex_sampler;\n"
 219                 "uniform vec3 light_direction;\n"
 220                 "uniform vec3 light_color;\n"
 221                 "uniform vec3 ambient_color;\n"
 222                 "uniform float fog_density;\n"
 223                 "out vec3 color;\n"
 224                 "vec3 rgb2hsl(vec3 c) {\n"
 225                         "vec4 K = vec4(0.0, -1.0/3.0, 2.0/3.0, -1.0);\n"
 226                         "vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));\n"
 227                         "vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));\n"
 228                         "float d = q.x - min(q.w, q.y);\n"
 229                         "float e = 1.0e-10;\n"
 230                         "return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);\n"
 231                 "}\n"
 232                 "vec3 hsl2rgb(vec3 c) {\n"
 233                         "vec4 K = vec4(1.0, 2.0/3.0, 1.0/3.0, 3.0);\n"
 234                         "vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);\n"
 235                         "return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);\n"
 236                 "}\n"
 237                 "void main() {\n"
 238                         "vec3 tex_color = texture(tex_sampler, frag_tex_uv).rgb;\n"
 239                         "vec3 hsl_color = rgb2hsl(tex_color);\n"
 240                         "hsl_color.x += frag_hsl_mod.x;\n"
 241                         "hsl_color.y *= frag_hsl_mod.y;\n"
 242                         "hsl_color.z *= frag_hsl_mod.z;\n"
 243                         "vec3 base_color = hsl2rgb(hsl_color) * frag_rgb_mod;\n"
 244                         "vec3 ambient = ambient_color * base_color;\n"
 245                         // this should be the same as the clear color, otherwise looks really weird
 246                         "vec3 fog_color = vec3(0, 0, 0);\n"
 247                         "float e = 2.718281828;\n"
 248                         "vec3 n = normalize(normal);\n"
 249                         "vec3 l = normalize(light_direction);\n"
 250                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
 251                         "vec3 reflect_color = ambient + base_color * light_color * cos_theta;\n"
 252                         "float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
 253                         "color = mix(fog_color, reflect_color, value);\n"
 254                 "}\n"
 255         );
 256         program.Link();
 257         if (!program.Linked()) {
 258                 program.Log(std::cerr);
 259                 throw std::runtime_error("link program");
 260         }
 261
 262         m_handle = program.UniformLocation("M");
 263         mv_handle = program.UniformLocation("MV");
 264         mvp_handle = program.UniformLocation("MVP");
 265         sampler_handle = program.UniformLocation("tex_sampler");
 266         light_direction_handle = program.UniformLocation("light_direction");
 267         light_color_handle = program.UniformLocation("light_color");
 268         ambient_color_handle = program.UniformLocation("ambient_color");
 269         fog_density_handle = program.UniformLocation("fog_density");
 270
 271         Activate();
 272         program.Uniform(light_direction_handle, glm::vec3(1.0f, 3.0f, 2.0f));
 273         program.Uniform(light_color_handle, glm::vec3(1.0f));
 274         program.Uniform(ambient_color_handle, glm::vec3(0.1f));
 275         program.Uniform(fog_density_handle, 0.0f);
 276 }
 277
 278
 279 void DirectionalLighting::Activate() noexcept {
 280         program.Use();
 281 }
 282
 283 void DirectionalLighting::SetM(const glm::mat4 &m) noexcept {
 284         program.Uniform(m_handle, m);
 285         program.Uniform(mv_handle, view * m);
 286         program.Uniform(mvp_handle, vp * m);
 287 }
 288
 289 void DirectionalLighting::SetLightDirection(const glm::vec3 &dir) noexcept {
 290         program.Uniform(light_direction_handle, -dir);
 291 }
 292
 293 void DirectionalLighting::SetLightColor(const glm::vec3 &col) noexcept {
 294         program.Uniform(light_color_handle, col);
 295 }
 296
 297 void DirectionalLighting::SetAmbientColor(const glm::vec3 &col) noexcept {
 298         program.Uniform(ambient_color_handle, col);
 299 }
 300
 301 void DirectionalLighting::SetTexture(ArrayTexture &tex) noexcept {
 302         glActiveTexture(GL_TEXTURE0);
 303         tex.Bind();
 304         program.Uniform(sampler_handle, GLint(0));
 305 }
 306
 307 void DirectionalLighting::SetFogDensity(float f) noexcept {
 308         program.Uniform(fog_density_handle, f);
 309 }
 310
 311 void DirectionalLighting::SetProjection(const glm::mat4 &p) noexcept {
 312         projection = p;
 313         vp = p * view;
 314 }
 315
 316 void DirectionalLighting::SetView(const glm::mat4 &v) noexcept {
 317         view = v;
 318         vp = projection * v;
 319 }
 320
 321 void DirectionalLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 322         projection = p;
 323         view = v;
 324         vp = p * v;
 325 }
 326
 327 void DirectionalLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 328         SetVP(v, p);
 329         SetM(m);
 330 }
 331
 332
 333 BlockLighting::BlockLighting()
 334 : program()
 335 , vp(1.0f)
 336 , mv_handle(0)
 337 , mvp_handle(0)
 338 , fog_density_handle(0) {
 339         program.LoadShader(
 340                 GL_VERTEX_SHADER,
 341                 "#version 330 core\n"
 342                 "layout(location = 0) in vec3 vtx_position;\n"
 343                 "layout(location = 1) in vec3 vtx_tex_uv;\n"
 344                 "layout(location = 2) in vec3 vtx_hsl_mod;\n"
 345                 "layout(location = 3) in vec3 vtx_rgb_mod;\n"
 346                 "layout(location = 4) in float vtx_light;\n"
 347                 "uniform mat4 MV;\n"
 348                 "uniform mat4 MVP;\n"
 349                 "out vec3 frag_tex_uv;\n"
 350                 "out vec3 frag_hsl_mod;\n"
 351                 "out vec3 frag_rgb_mod;\n"
 352                 "out vec3 vtx_viewspace;\n"
 353                 "out float frag_light;\n"
 354                 "void main() {\n"
 355                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 356                         "frag_tex_uv = vtx_tex_uv;\n"
 357                         "frag_hsl_mod = vtx_hsl_mod;\n"
 358                         "frag_rgb_mod = vtx_rgb_mod;\n"
 359                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 360                         "frag_light = vtx_light;\n"
 361                 "}\n"
 362         );
 363         program.LoadShader(
 364                 GL_FRAGMENT_SHADER,
 365                 "#version 330 core\n"
 366                 "in vec3 frag_tex_uv;\n"
 367                 "in vec3 frag_hsl_mod;\n"
 368                 "in vec3 frag_rgb_mod;\n"
 369                 "in vec3 vtx_viewspace;\n"
 370                 "in float frag_light;\n"
 371                 "uniform sampler2DArray tex_sampler;\n"
 372                 "uniform float fog_density;\n"
 373                 "out vec3 color;\n"
 374                 "vec3 rgb2hsl(vec3 c) {\n"
 375                         "vec4 K = vec4(0.0, -1.0/3.0, 2.0/3.0, -1.0);\n"
 376                         "vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));\n"
 377                         "vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));\n"
 378                         "float d = q.x - min(q.w, q.y);\n"
 379                         "float e = 1.0e-10;\n"
 380                         "return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);\n"
 381                 "}\n"
 382                 "vec3 hsl2rgb(vec3 c) {\n"
 383                         "vec4 K = vec4(1.0, 2.0/3.0, 1.0/3.0, 3.0);\n"
 384                         "vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);\n"
 385                         "return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);\n"
 386                 "}\n"
 387                 "void main() {\n"
 388                         "vec3 tex_color = texture(tex_sampler, frag_tex_uv).rgb;\n"
 389                         "vec3 hsl_color = rgb2hsl(tex_color);\n"
 390                         "hsl_color.x += frag_hsl_mod.x;\n"
 391                         "hsl_color.y *= frag_hsl_mod.y;\n"
 392                         "hsl_color.z *= frag_hsl_mod.z;\n"
 393                         "vec3 base_color = hsl2rgb(hsl_color) * frag_rgb_mod;\n"
 394                         "float light_power = clamp(pow(0.8, 15 - frag_light), 0, 1);\n"
 395                         "vec3 fog_color = vec3(0, 0, 0);\n"
 396                         "float e = 2.718281828;\n"
 397                         "vec3 reflect_color = base_color * light_power;\n"
 398                         "float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
 399                         "color = mix(fog_color, reflect_color, value);\n"
 400                 "}\n"
 401         );
 402         program.Link();
 403         if (!program.Linked()) {
 404                 program.Log(std::cerr);
 405                 throw std::runtime_error("link program");
 406         }
 407
 408         mv_handle = program.UniformLocation("MV");
 409         mvp_handle = program.UniformLocation("MVP");
 410         sampler_handle = program.UniformLocation("tex_sampler");
 411         fog_density_handle = program.UniformLocation("fog_density");
 412 }
 413
 414
 415 void BlockLighting::Activate() noexcept {
 416         program.Use();
 417 }
 418
 419 void BlockLighting::SetTexture(ArrayTexture &tex) noexcept {
 420         glActiveTexture(GL_TEXTURE0);
 421         tex.Bind();
 422         program.Uniform(sampler_handle, GLint(0));
 423 }
 424
 425 void BlockLighting::SetFogDensity(float f) noexcept {
 426         program.Uniform(fog_density_handle, f);
 427 }
 428
 429 void BlockLighting::SetM(const glm::mat4 &m) noexcept {
 430         program.Uniform(mv_handle, view * m);
 431         program.Uniform(mvp_handle, vp * m);
 432 }
 433
 434 void BlockLighting::SetProjection(const glm::mat4 &p) noexcept {
 435         projection = p;
 436         vp = p * view;
 437 }
 438
 439 void BlockLighting::SetView(const glm::mat4 &v) noexcept {
 440         view = v;
 441         vp = projection * v;
 442 }
 443
 444 void BlockLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 445         projection = p;
 446         view = v;
 447         vp = p * v;
 448 }
 449
 450 void BlockLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 451         SetVP(v, p);
 452         SetM(m);
 453 }
 454
 455
 456 BlendedSprite::BlendedSprite()
 457 : program()
 458 , vp(1.0f)
 459 , mvp_handle(0)
 460 , sampler_handle(0) {
 461         program.LoadShader(
 462                 GL_VERTEX_SHADER,
 463                 "#version 330 core\n"
 464                 "layout(location = 0) in vec3 vtx_position;\n"
 465                 "layout(location = 1) in vec2 vtx_tex_uv;\n"
 466                 "uniform mat4 MVP;\n"
 467                 "out vec2 frag_tex_uv;\n"
 468                 "void main() {\n"
 469                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 470                         "frag_tex_uv = vtx_tex_uv;\n"
 471                 "}\n"
 472         );
 473         program.LoadShader(
 474                 GL_FRAGMENT_SHADER,
 475                 "#version 330 core\n"
 476                 "in vec2 frag_tex_uv;\n"
 477                 "uniform sampler2D tex_sampler;\n"
 478                 "uniform vec4 fg_factor;\n"
 479                 "uniform vec4 bg_factor;\n"
 480                 "out vec4 color;\n"
 481                 "void main() {\n"
 482                         "vec4 tex_color = texture(tex_sampler, frag_tex_uv);\n"
 483                         "vec4 factor = mix(bg_factor, fg_factor, tex_color.a);\n"
 484                         "color = tex_color * factor;\n"
 485                         "color.a = factor.a;\n"
 486                 "}\n"
 487         );
 488         program.Link();
 489         if (!program.Linked()) {
 490                 program.Log(std::cerr);
 491                 throw std::runtime_error("link program");
 492         }
 493
 494         mvp_handle = program.UniformLocation("MVP");
 495         sampler_handle = program.UniformLocation("tex_sampler");
 496         fg_handle = program.UniformLocation("fg_factor");
 497         bg_handle = program.UniformLocation("bg_factor");
 498
 499         Activate();
 500         SetFG(glm::vec4(1.0f, 1.0f, 1.0f, 1.0f));
 501         SetBG(glm::vec4(1.0f, 1.0f, 1.0f, 0.0f));
 502 }
 503
 504
 505 void BlendedSprite::Activate() noexcept {
 506         program.Use();
 507 }
 508
 509 void BlendedSprite::SetM(const glm::mat4 &m) noexcept {
 510         program.Uniform(mvp_handle, vp * m);
 511 }
 512
 513 void BlendedSprite::SetProjection(const glm::mat4 &p) noexcept {
 514         projection = p;
 515         vp = p * view;
 516 }
 517
 518 void BlendedSprite::SetView(const glm::mat4 &v) noexcept {
 519         view = v;
 520         vp = projection * v;
 521 }
 522
 523 void BlendedSprite::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 524         projection = p;
 525         view = v;
 526         vp = p * v;
 527 }
 528
 529 void BlendedSprite::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 530         SetVP(v, p);
 531         SetM(m);
 532 }
 533
 534 void BlendedSprite::SetTexture(Texture &tex) noexcept {
 535         glActiveTexture(GL_TEXTURE0);
 536         tex.Bind();
 537         program.Uniform(sampler_handle, GLint(0));
 538 }
 539
 540 void BlendedSprite::SetFG(const glm::vec4 &v) noexcept {
 541         program.Uniform(fg_handle, v);
 542 }
 543
 544 void BlendedSprite::SetBG(const glm::vec4 &v) noexcept {
 545         program.Uniform(bg_handle, v);
 546 }
 547
 548
 549 SkyBoxShader::SkyBoxShader()
 550 : program()
 551 , vp(1.0f)
 552 , vp_handle(0)
 553 , sampler_handle(0) {
 554         program.LoadShader(
 555                 GL_VERTEX_SHADER,
 556                 "#version 330 core\n"
 557                 "layout(location = 0) in vec3 vtx_position;\n"
 558                 "uniform mat4 VP;\n"
 559                 "out vec3 vtx_viewspace;\n"
 560                 "void main() {\n"
 561                         "gl_Position = VP * vec4(vtx_position, 1);\n"
 562                         "gl_Position.z = gl_Position.w;\n"
 563                         "vtx_viewspace = vtx_position;\n"
 564                 "}\n"
 565         );
 566         program.LoadShader(
 567                 GL_FRAGMENT_SHADER,
 568                 "#version 330 core\n"
 569                 "in vec3 vtx_viewspace;\n"
 570                 "uniform samplerCube tex_sampler;\n"
 571                 "out vec3 color;\n"
 572                 "void main() {\n"
 573                         "color = texture(tex_sampler, vtx_viewspace).rgb;\n"
 574                         //"color = vec3(1,0,0);\n"
 575                 "}\n"
 576         );
 577         program.Link();
 578         if (!program.Linked()) {
 579                 program.Log(std::cerr);
 580                 throw std::runtime_error("link program");
 581         }
 582
 583         vp_handle = program.UniformLocation("VP");
 584         sampler_handle = program.UniformLocation("tex_sampler");
 585 }
 586
 587
 588 void SkyBoxShader::Activate() noexcept {
 589         program.Use();
 590 }
 591
 592 void SkyBoxShader::SetTexture(CubeMap &tex) noexcept {
 593         glActiveTexture(GL_TEXTURE0);
 594         tex.Bind();
 595         program.Uniform(sampler_handle, GLint(0));
 596 }
 597
 598 void SkyBoxShader::SetProjection(const glm::mat4 &p) noexcept {
 599         projection = p;
 600         vp = p * view;
 601         program.Uniform(vp_handle, vp);
 602 }
 603
 604 void SkyBoxShader::SetView(const glm::mat4 &v) noexcept {
 605         view = v;
 606         view[0].w = 0.0f;
 607         view[1].w = 0.0f;
 608         view[2].w = 0.0f;
 609         view[3] = glm::vec4(0.0f, 0.0f, 0.0f, 1.0f);
 610         vp = projection * view;
 611         program.Uniform(vp_handle, vp);
 612 }
 613
 614 void SkyBoxShader::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 615         projection = p;
 616         SetView(v);
 617 }
 618
 619
 620 PlainColor::PlainColor()
 621 : program()
 622 , vp(1.0f)
 623 , mvp_handle(0) {
 624         program.LoadShader(
 625                 GL_VERTEX_SHADER,
 626                 "#version 330 core\n"
 627                 "layout(location = 0) in vec3 vtx_position;\n"
 628                 "layout(location = 1) in vec4 vtx_color;\n"
 629                 "uniform mat4 MVP;\n"
 630                 "out vec4 frag_color;\n"
 631                 "void main() {\n"
 632                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 633                         "frag_color = vtx_color;\n"
 634                 "}\n"
 635         );
 636         program.LoadShader(
 637                 GL_FRAGMENT_SHADER,
 638                 "#version 330 core\n"
 639                 "in vec4 frag_color;\n"
 640                 "out vec4 color;\n"
 641                 "void main() {\n"
 642                         "color = frag_color;\n"
 643                 "}\n"
 644         );
 645         program.Link();
 646         if (!program.Linked()) {
 647                 program.Log(std::cerr);
 648                 throw std::runtime_error("link program");
 649         }
 650
 651         mvp_handle = program.UniformLocation("MVP");
 652 }
 653
 654
 655 void PlainColor::Activate() noexcept {
 656         program.Use();
 657 }
 658
 659 void PlainColor::SetM(const glm::mat4 &m) noexcept {
 660         program.Uniform(mvp_handle, vp * m);
 661 }
 662
 663 void PlainColor::SetProjection(const glm::mat4 &p) noexcept {
 664         projection = p;
 665         vp = p * view;
 666 }
 667
 668 void PlainColor::SetView(const glm::mat4 &v) noexcept {
 669         view = v;
 670         vp = projection * v;
 671 }
 672
 673 void PlainColor::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 674         projection = p;
 675         view = v;
 676         vp = p * v;
 677 }
 678
 679 void PlainColor::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 680         SetVP(v, p);
 681         SetM(m);
 682 }
 683
 684 }