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 , fog_density_handle(0) {
 184         program.LoadShader(
 185                 GL_VERTEX_SHADER,
 186                 "#version 330 core\n"
 187                 "layout(location = 0) in vec3 vtx_position;\n"
 188                 "layout(location = 1) in vec3 vtx_tex_uv;\n"
 189                 "layout(location = 2) in vec3 vtx_hsl_mod;\n"
 190                 "layout(location = 3) in vec3 vtx_rgb_mod;\n"
 191                 "layout(location = 4) in vec3 vtx_normal;\n"
 192                 "uniform mat4 M;\n"
 193                 "uniform mat4 MV;\n"
 194                 "uniform mat4 MVP;\n"
 195                 "out vec3 frag_tex_uv;\n"
 196                 "out vec3 frag_hsl_mod;\n"
 197                 "out vec3 frag_rgb_mod;\n"
 198                 "out vec3 vtx_viewspace;\n"
 199                 "out vec3 normal;\n"
 200                 "void main() {\n"
 201                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 202                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 203                         "normal = (M * vec4(vtx_normal, 0)).xyz;\n"
 204                         "frag_tex_uv = vtx_tex_uv;\n"
 205                         "frag_hsl_mod = vtx_hsl_mod;\n"
 206                         "frag_rgb_mod = vtx_rgb_mod;\n"
 207                 "}\n"
 208         );
 209         program.LoadShader(
 210                 GL_FRAGMENT_SHADER,
 211                 "#version 330 core\n"
 212                 "in vec3 frag_tex_uv;\n"
 213                 "in vec3 frag_hsl_mod;\n"
 214                 "in vec3 frag_rgb_mod;\n"
 215                 "in vec3 vtx_viewspace;\n"
 216                 "in vec3 normal;\n"
 217                 "uniform sampler2DArray tex_sampler;\n"
 218                 "uniform vec3 light_direction;\n"
 219                 "uniform vec3 light_color;\n"
 220                 "uniform float fog_density;\n"
 221                 "out vec3 color;\n"
 222                 "vec3 rgb2hsl(vec3 c) {\n"
 223                         "vec4 K = vec4(0.0, -1.0/3.0, 2.0/3.0, -1.0);\n"
 224                         "vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));\n"
 225                         "vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));\n"
 226                         "float d = q.x - min(q.w, q.y);\n"
 227                         "float e = 1.0e-10;\n"
 228                         "return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);\n"
 229                 "}\n"
 230                 "vec3 hsl2rgb(vec3 c) {\n"
 231                         "vec4 K = vec4(1.0, 2.0/3.0, 1.0/3.0, 3.0);\n"
 232                         "vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);\n"
 233                         "return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);\n"
 234                 "}\n"
 235                 "void main() {\n"
 236                         "vec3 tex_color = texture(tex_sampler, frag_tex_uv).rgb;\n"
 237                         "vec3 hsl_color = rgb2hsl(tex_color);\n"
 238                         "hsl_color.x += frag_hsl_mod.x;\n"
 239                         "hsl_color.y *= frag_hsl_mod.y;\n"
 240                         "hsl_color.z *= frag_hsl_mod.z;\n"
 241                         "vec3 base_color = hsl2rgb(hsl_color) * frag_rgb_mod;\n"
 242                         "vec3 ambient = vec3(0.1, 0.1, 0.1) * base_color;\n"
 243                         // this should be the same as the clear color, otherwise looks really weird
 244                         "vec3 fog_color = vec3(0, 0, 0);\n"
 245                         "float e = 2.718281828;\n"
 246                         "vec3 n = normalize(normal);\n"
 247                         "vec3 l = normalize(light_direction);\n"
 248                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
 249                         "vec3 reflect_color = ambient + base_color * light_color * cos_theta;\n"
 250                         "float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
 251                         "color = mix(fog_color, reflect_color, value);\n"
 252                 "}\n"
 253         );
 254         program.Link();
 255         if (!program.Linked()) {
 256                 program.Log(std::cerr);
 257                 throw std::runtime_error("link program");
 258         }
 259
 260         m_handle = program.UniformLocation("M");
 261         mv_handle = program.UniformLocation("MV");
 262         mvp_handle = program.UniformLocation("MVP");
 263         sampler_handle = program.UniformLocation("tex_sampler");
 264         light_direction_handle = program.UniformLocation("light_direction");
 265         light_color_handle = program.UniformLocation("light_color");
 266         fog_density_handle = program.UniformLocation("fog_density");
 267
 268         Activate();
 269         program.Uniform(light_direction_handle, glm::vec3(1.0f, 3.0f, 2.0f));
 270         program.Uniform(light_color_handle, glm::vec3(1.0f));
 271         program.Uniform(fog_density_handle, 0.0f);
 272 }
 273
 274
 275 void DirectionalLighting::Activate() noexcept {
 276         program.Use();
 277 }
 278
 279 void DirectionalLighting::SetM(const glm::mat4 &m) noexcept {
 280         program.Uniform(m_handle, m);
 281         program.Uniform(mv_handle, view * m);
 282         program.Uniform(mvp_handle, vp * m);
 283 }
 284
 285 void DirectionalLighting::SetLightDirection(const glm::vec3 &dir) noexcept {
 286         program.Uniform(light_direction_handle, -dir);
 287 }
 288
 289 void DirectionalLighting::SetLightColor(const glm::vec3 &col) noexcept {
 290         program.Uniform(light_color_handle, col);
 291 }
 292
 293 void DirectionalLighting::SetTexture(ArrayTexture &tex) noexcept {
 294         glActiveTexture(GL_TEXTURE0);
 295         tex.Bind();
 296         program.Uniform(sampler_handle, GLint(0));
 297 }
 298
 299 void DirectionalLighting::SetFogDensity(float f) noexcept {
 300         program.Uniform(fog_density_handle, f);
 301 }
 302
 303 void DirectionalLighting::SetProjection(const glm::mat4 &p) noexcept {
 304         projection = p;
 305         vp = p * view;
 306 }
 307
 308 void DirectionalLighting::SetView(const glm::mat4 &v) noexcept {
 309         view = v;
 310         vp = projection * v;
 311 }
 312
 313 void DirectionalLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 314         projection = p;
 315         view = v;
 316         vp = p * v;
 317 }
 318
 319 void DirectionalLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 320         SetVP(v, p);
 321         SetM(m);
 322 }
 323
 324
 325 BlockLighting::BlockLighting()
 326 : program()
 327 , vp(1.0f)
 328 , mv_handle(0)
 329 , mvp_handle(0)
 330 , fog_density_handle(0) {
 331         program.LoadShader(
 332                 GL_VERTEX_SHADER,
 333                 "#version 330 core\n"
 334                 "layout(location = 0) in vec3 vtx_position;\n"
 335                 "layout(location = 1) in vec3 vtx_tex_uv;\n"
 336                 "layout(location = 2) in vec3 vtx_hsl_mod;\n"
 337                 "layout(location = 3) in vec3 vtx_rgb_mod;\n"
 338                 "layout(location = 4) in float vtx_light;\n"
 339                 "uniform mat4 MV;\n"
 340                 "uniform mat4 MVP;\n"
 341                 "out vec3 frag_tex_uv;\n"
 342                 "out vec3 frag_hsl_mod;\n"
 343                 "out vec3 frag_rgb_mod;\n"
 344                 "out vec3 vtx_viewspace;\n"
 345                 "out float frag_light;\n"
 346                 "void main() {\n"
 347                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 348                         "frag_tex_uv = vtx_tex_uv;\n"
 349                         "frag_hsl_mod = vtx_hsl_mod;\n"
 350                         "frag_rgb_mod = vtx_rgb_mod;\n"
 351                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 352                         "frag_light = vtx_light;\n"
 353                 "}\n"
 354         );
 355         program.LoadShader(
 356                 GL_FRAGMENT_SHADER,
 357                 "#version 330 core\n"
 358                 "in vec3 frag_tex_uv;\n"
 359                 "in vec3 frag_hsl_mod;\n"
 360                 "in vec3 frag_rgb_mod;\n"
 361                 "in vec3 vtx_viewspace;\n"
 362                 "in float frag_light;\n"
 363                 "uniform sampler2DArray tex_sampler;\n"
 364                 "uniform float fog_density;\n"
 365                 "out vec3 color;\n"
 366                 "vec3 rgb2hsl(vec3 c) {\n"
 367                         "vec4 K = vec4(0.0, -1.0/3.0, 2.0/3.0, -1.0);\n"
 368                         "vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));\n"
 369                         "vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));\n"
 370                         "float d = q.x - min(q.w, q.y);\n"
 371                         "float e = 1.0e-10;\n"
 372                         "return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);\n"
 373                 "}\n"
 374                 "vec3 hsl2rgb(vec3 c) {\n"
 375                         "vec4 K = vec4(1.0, 2.0/3.0, 1.0/3.0, 3.0);\n"
 376                         "vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);\n"
 377                         "return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);\n"
 378                 "}\n"
 379                 "void main() {\n"
 380                         "vec3 tex_color = texture(tex_sampler, frag_tex_uv).rgb;\n"
 381                         "vec3 hsl_color = rgb2hsl(tex_color);\n"
 382                         "hsl_color.x += frag_hsl_mod.x;\n"
 383                         "hsl_color.y *= frag_hsl_mod.y;\n"
 384                         "hsl_color.z *= frag_hsl_mod.z;\n"
 385                         "vec3 base_color = hsl2rgb(hsl_color) * frag_rgb_mod;\n"
 386                         "float light_power = clamp(pow(0.8, 15 - frag_light), 0, 1);\n"
 387                         "vec3 fog_color = vec3(0, 0, 0);\n"
 388                         "float e = 2.718281828;\n"
 389                         "vec3 reflect_color = base_color * light_power;\n"
 390                         "float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
 391                         "color = mix(fog_color, reflect_color, value);\n"
 392                 "}\n"
 393         );
 394         program.Link();
 395         if (!program.Linked()) {
 396                 program.Log(std::cerr);
 397                 throw std::runtime_error("link program");
 398         }
 399
 400         mv_handle = program.UniformLocation("MV");
 401         mvp_handle = program.UniformLocation("MVP");
 402         sampler_handle = program.UniformLocation("tex_sampler");
 403         fog_density_handle = program.UniformLocation("fog_density");
 404 }
 405
 406
 407 void BlockLighting::Activate() noexcept {
 408         program.Use();
 409 }
 410
 411 void BlockLighting::SetTexture(ArrayTexture &tex) noexcept {
 412         glActiveTexture(GL_TEXTURE0);
 413         tex.Bind();
 414         program.Uniform(sampler_handle, GLint(0));
 415 }
 416
 417 void BlockLighting::SetFogDensity(float f) noexcept {
 418         program.Uniform(fog_density_handle, f);
 419 }
 420
 421 void BlockLighting::SetM(const glm::mat4 &m) noexcept {
 422         program.Uniform(mv_handle, view * m);
 423         program.Uniform(mvp_handle, vp * m);
 424 }
 425
 426 void BlockLighting::SetProjection(const glm::mat4 &p) noexcept {
 427         projection = p;
 428         vp = p * view;
 429 }
 430
 431 void BlockLighting::SetView(const glm::mat4 &v) noexcept {
 432         view = v;
 433         vp = projection * v;
 434 }
 435
 436 void BlockLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 437         projection = p;
 438         view = v;
 439         vp = p * v;
 440 }
 441
 442 void BlockLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 443         SetVP(v, p);
 444         SetM(m);
 445 }
 446
 447
 448 BlendedSprite::BlendedSprite()
 449 : program()
 450 , vp(1.0f)
 451 , mvp_handle(0)
 452 , sampler_handle(0) {
 453         program.LoadShader(
 454                 GL_VERTEX_SHADER,
 455                 "#version 330 core\n"
 456                 "layout(location = 0) in vec3 vtx_position;\n"
 457                 "layout(location = 1) in vec2 vtx_tex_uv;\n"
 458                 "uniform mat4 MVP;\n"
 459                 "out vec2 frag_tex_uv;\n"
 460                 "void main() {\n"
 461                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 462                         "frag_tex_uv = vtx_tex_uv;\n"
 463                 "}\n"
 464         );
 465         program.LoadShader(
 466                 GL_FRAGMENT_SHADER,
 467                 "#version 330 core\n"
 468                 "in vec2 frag_tex_uv;\n"
 469                 "uniform sampler2D tex_sampler;\n"
 470                 "uniform vec4 fg_factor;\n"
 471                 "uniform vec4 bg_factor;\n"
 472                 "out vec4 color;\n"
 473                 "void main() {\n"
 474                         "vec4 tex_color = texture(tex_sampler, frag_tex_uv);\n"
 475                         "vec4 factor = mix(bg_factor, fg_factor, tex_color.a);\n"
 476                         "color = tex_color * factor;\n"
 477                         "color.a = factor.a;\n"
 478                 "}\n"
 479         );
 480         program.Link();
 481         if (!program.Linked()) {
 482                 program.Log(std::cerr);
 483                 throw std::runtime_error("link program");
 484         }
 485
 486         mvp_handle = program.UniformLocation("MVP");
 487         sampler_handle = program.UniformLocation("tex_sampler");
 488         fg_handle = program.UniformLocation("fg_factor");
 489         bg_handle = program.UniformLocation("bg_factor");
 490
 491         Activate();
 492         SetFG(glm::vec4(1.0f, 1.0f, 1.0f, 1.0f));
 493         SetBG(glm::vec4(1.0f, 1.0f, 1.0f, 0.0f));
 494 }
 495
 496
 497 void BlendedSprite::Activate() noexcept {
 498         program.Use();
 499 }
 500
 501 void BlendedSprite::SetM(const glm::mat4 &m) noexcept {
 502         program.Uniform(mvp_handle, vp * m);
 503 }
 504
 505 void BlendedSprite::SetProjection(const glm::mat4 &p) noexcept {
 506         projection = p;
 507         vp = p * view;
 508 }
 509
 510 void BlendedSprite::SetView(const glm::mat4 &v) noexcept {
 511         view = v;
 512         vp = projection * v;
 513 }
 514
 515 void BlendedSprite::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 516         projection = p;
 517         view = v;
 518         vp = p * v;
 519 }
 520
 521 void BlendedSprite::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 522         SetVP(v, p);
 523         SetM(m);
 524 }
 525
 526 void BlendedSprite::SetTexture(Texture &tex) noexcept {
 527         glActiveTexture(GL_TEXTURE0);
 528         tex.Bind();
 529         program.Uniform(sampler_handle, GLint(0));
 530 }
 531
 532 void BlendedSprite::SetFG(const glm::vec4 &v) noexcept {
 533         program.Uniform(fg_handle, v);
 534 }
 535
 536 void BlendedSprite::SetBG(const glm::vec4 &v) noexcept {
 537         program.Uniform(bg_handle, v);
 538 }
 539
 540
 541 SkyBoxShader::SkyBoxShader()
 542 : program()
 543 , vp(1.0f)
 544 , vp_handle(0)
 545 , sampler_handle(0) {
 546         program.LoadShader(
 547                 GL_VERTEX_SHADER,
 548                 "#version 330 core\n"
 549                 "layout(location = 0) in vec3 vtx_position;\n"
 550                 "uniform mat4 VP;\n"
 551                 "out vec3 vtx_viewspace;\n"
 552                 "void main() {\n"
 553                         "gl_Position = VP * vec4(vtx_position, 1);\n"
 554                         "gl_Position.z = gl_Position.w;\n"
 555                         "vtx_viewspace = vtx_position;\n"
 556                 "}\n"
 557         );
 558         program.LoadShader(
 559                 GL_FRAGMENT_SHADER,
 560                 "#version 330 core\n"
 561                 "in vec3 vtx_viewspace;\n"
 562                 "uniform samplerCube tex_sampler;\n"
 563                 "out vec3 color;\n"
 564                 "void main() {\n"
 565                         "color = texture(tex_sampler, vtx_viewspace).rgb;\n"
 566                         //"color = vec3(1,0,0);\n"
 567                 "}\n"
 568         );
 569         program.Link();
 570         if (!program.Linked()) {
 571                 program.Log(std::cerr);
 572                 throw std::runtime_error("link program");
 573         }
 574
 575         vp_handle = program.UniformLocation("VP");
 576         sampler_handle = program.UniformLocation("tex_sampler");
 577 }
 578
 579
 580 void SkyBoxShader::Activate() noexcept {
 581         program.Use();
 582 }
 583
 584 void SkyBoxShader::SetTexture(CubeMap &tex) noexcept {
 585         glActiveTexture(GL_TEXTURE0);
 586         tex.Bind();
 587         program.Uniform(sampler_handle, GLint(0));
 588 }
 589
 590 void SkyBoxShader::SetProjection(const glm::mat4 &p) noexcept {
 591         projection = p;
 592         vp = p * view;
 593         program.Uniform(vp_handle, vp);
 594 }
 595
 596 void SkyBoxShader::SetView(const glm::mat4 &v) noexcept {
 597         view = v;
 598         view[0].w = 0.0f;
 599         view[1].w = 0.0f;
 600         view[2].w = 0.0f;
 601         view[3] = glm::vec4(0.0f, 0.0f, 0.0f, 1.0f);
 602         vp = projection * view;
 603         program.Uniform(vp_handle, vp);
 604 }
 605
 606 void SkyBoxShader::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 607         projection = p;
 608         SetView(v);
 609 }
 610
 611
 612 PlainColor::PlainColor()
 613 : program()
 614 , vp(1.0f)
 615 , mvp_handle(0) {
 616         program.LoadShader(
 617                 GL_VERTEX_SHADER,
 618                 "#version 330 core\n"
 619                 "layout(location = 0) in vec3 vtx_position;\n"
 620                 "layout(location = 1) in vec3 vtx_color;\n"
 621                 "uniform mat4 MVP;\n"
 622                 "out vec3 frag_color;\n"
 623                 "void main() {\n"
 624                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 625                         "frag_color = vtx_color;\n"
 626                 "}\n"
 627         );
 628         program.LoadShader(
 629                 GL_FRAGMENT_SHADER,
 630                 "#version 330 core\n"
 631                 "in vec3 frag_color;\n"
 632                 "out vec3 color;\n"
 633                 "void main() {\n"
 634                         "color = frag_color;\n"
 635                 "}\n"
 636         );
 637         program.Link();
 638         if (!program.Linked()) {
 639                 program.Log(std::cerr);
 640                 throw std::runtime_error("link program");
 641         }
 642
 643         mvp_handle = program.UniformLocation("MVP");
 644 }
 645
 646
 647 void PlainColor::Activate() noexcept {
 648         program.Use();
 649 }
 650
 651 void PlainColor::SetM(const glm::mat4 &m) noexcept {
 652         program.Uniform(mvp_handle, vp * m);
 653 }
 654
 655 void PlainColor::SetProjection(const glm::mat4 &p) noexcept {
 656         projection = p;
 657         vp = p * view;
 658 }
 659
 660 void PlainColor::SetView(const glm::mat4 &v) noexcept {
 661         view = v;
 662         vp = projection * v;
 663 }
 664
 665 void PlainColor::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 666         projection = p;
 667         view = v;
 668         vp = p * v;
 669 }
 670
 671 void PlainColor::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 672         SetVP(v, p);
 673         SetM(m);
 674 }
 675
 676 }