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/error.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 blank {
  24
  25 Shader::Shader(GLenum type)
  26 : handle(glCreateShader(type)) {
  27         if (handle == 0) {
  28                 throw GLError("glCreateShader");
  29         }
  30 }
  31
  32 Shader::~Shader() {
  33         if (handle != 0) {
  34                 glDeleteShader(handle);
  35         }
  36 }
  37
  38 Shader::Shader(Shader &&other) noexcept
  39 : handle(other.handle) {
  40         other.handle = 0;
  41 }
  42
  43 Shader &Shader::operator =(Shader &&other) noexcept {
  44         std::swap(handle, other.handle);
  45         return *this;
  46 }
  47
  48
  49 void Shader::Source(const GLchar *src) noexcept {
  50         const GLchar* src_arr[] = { src };
  51         glShaderSource(handle, 1, src_arr, nullptr);
  52 }
  53
  54 void Shader::Compile() noexcept {
  55         glCompileShader(handle);
  56 }
  57
  58 bool Shader::Compiled() const noexcept {
  59         GLint compiled = GL_FALSE;
  60         glGetShaderiv(handle, GL_COMPILE_STATUS, &compiled);
  61         return compiled == GL_TRUE;
  62 }
  63
  64 void Shader::Log(std::ostream &out) const {
  65         int log_len = 0, max_len = 0;
  66         glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &max_len);
  67         std::unique_ptr<char[]> log(new char[max_len]);
  68         glGetShaderInfoLog(handle, max_len, &log_len, log.get());
  69         out.write(log.get(), log_len);
  70 }
  71
  72
  73 void Shader::AttachToProgram(GLuint id) const noexcept {
  74         glAttachShader(id, handle);
  75 }
  76
  77
  78 Program::Program()
  79 : handle(glCreateProgram()) {
  80         if (handle == 0) {
  81                 throw GLError("glCreateProgram");
  82         }
  83 }
  84
  85 Program::~Program() {
  86         if (handle != 0) {
  87                 glDeleteProgram(handle);
  88         }
  89 }
  90
  91
  92 const Shader &Program::LoadShader(GLenum type, const GLchar *src) {
  93         shaders.emplace_back(type);
  94         Shader &shader = shaders.back();
  95         shader.Source(src);
  96         shader.Compile();
  97         if (!shader.Compiled()) {
  98                 shader.Log(std::cerr);
  99                 throw std::runtime_error("compile shader");
 100         }
 101         Attach(shader);
 102         return shader;
 103 }
 104
 105 void Program::Attach(Shader &shader) noexcept {
 106         shader.AttachToProgram(handle);
 107 }
 108
 109 void Program::Link() noexcept {
 110         glLinkProgram(handle);
 111 }
 112
 113 bool Program::Linked() const noexcept {
 114         GLint linked = GL_FALSE;
 115         glGetProgramiv(handle, GL_LINK_STATUS, &linked);
 116         return linked == GL_TRUE;
 117 }
 118
 119 void Program::Log(std::ostream &out) const {
 120         int log_len = 0, max_len = 0;
 121         glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &max_len);
 122         std::unique_ptr<char[]> log(new char[max_len]);
 123         glGetProgramInfoLog(handle, max_len, &log_len, log.get());
 124         out.write(log.get(), log_len);
 125 }
 126
 127
 128 GLint Program::AttributeLocation(const GLchar *name) const noexcept {
 129         return glGetAttribLocation(handle, name);
 130 }
 131
 132 GLint Program::UniformLocation(const GLchar *name) const noexcept {
 133         return glGetUniformLocation(handle, name);
 134 }
 135
 136
 137 void Program::Uniform(GLint loc, GLint val) noexcept {
 138         glUniform1i(loc, val);
 139 }
 140
 141 void Program::Uniform(GLint loc, float val) noexcept {
 142         glUniform1f(loc, val);
 143 }
 144
 145 void Program::Uniform(GLint loc, const glm::vec3 &val) noexcept {
 146         glUniform3fv(loc, 1, glm::value_ptr(val));
 147 }
 148
 149 void Program::Uniform(GLint loc, const glm::vec4 &val) noexcept {
 150         glUniform4fv(loc, 1, glm::value_ptr(val));
 151 }
 152
 153 void Program::Uniform(GLint loc, const glm::mat4 &val) noexcept {
 154         glUniformMatrix4fv(loc, 1, GL_FALSE, glm::value_ptr(val));
 155 }
 156
 157
 158 DirectionalLighting::DirectionalLighting()
 159 : program()
 160 , vp(1.0f)
 161 , m_handle(0)
 162 , mv_handle(0)
 163 , mvp_handle(0)
 164 , light_direction_handle(0)
 165 , light_color_handle(0)
 166 , ambient_color_handle(0)
 167 , fog_density_handle(0) {
 168         program.LoadShader(
 169                 GL_VERTEX_SHADER,
 170                 "#version 330 core\n"
 171                 "layout(location = 0) in vec3 vtx_position;\n"
 172                 "layout(location = 1) in vec3 vtx_tex_uv;\n"
 173                 "layout(location = 2) in vec3 vtx_hsl_mod;\n"
 174                 "layout(location = 3) in vec3 vtx_rgb_mod;\n"
 175                 "layout(location = 4) in vec3 vtx_normal;\n"
 176                 "uniform mat4 M;\n"
 177                 "uniform mat4 MV;\n"
 178                 "uniform mat4 MVP;\n"
 179                 "out vec3 frag_tex_uv;\n"
 180                 "out vec3 frag_hsl_mod;\n"
 181                 "out vec3 frag_rgb_mod;\n"
 182                 "out vec3 vtx_viewspace;\n"
 183                 "out vec3 normal;\n"
 184                 "void main() {\n"
 185                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 186                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 187                         "normal = (M * vec4(vtx_normal, 0)).xyz;\n"
 188                         "frag_tex_uv = vtx_tex_uv;\n"
 189                         "frag_hsl_mod = vtx_hsl_mod;\n"
 190                         "frag_rgb_mod = vtx_rgb_mod;\n"
 191                 "}\n"
 192         );
 193         program.LoadShader(
 194                 GL_FRAGMENT_SHADER,
 195                 "#version 330 core\n"
 196                 "in vec3 frag_tex_uv;\n"
 197                 "in vec3 frag_hsl_mod;\n"
 198                 "in vec3 frag_rgb_mod;\n"
 199                 "in vec3 vtx_viewspace;\n"
 200                 "in vec3 normal;\n"
 201                 "uniform sampler2DArray tex_sampler;\n"
 202                 "uniform vec3 light_direction;\n"
 203                 "uniform vec3 light_color;\n"
 204                 "uniform vec3 ambient_color;\n"
 205                 "uniform float fog_density;\n"
 206                 "out vec3 color;\n"
 207                 "vec3 rgb2hsl(vec3 c) {\n"
 208                         "vec4 K = vec4(0.0, -1.0/3.0, 2.0/3.0, -1.0);\n"
 209                         "vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));\n"
 210                         "vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));\n"
 211                         "float d = q.x - min(q.w, q.y);\n"
 212                         "float e = 1.0e-10;\n"
 213                         "return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);\n"
 214                 "}\n"
 215                 "vec3 hsl2rgb(vec3 c) {\n"
 216                         "vec4 K = vec4(1.0, 2.0/3.0, 1.0/3.0, 3.0);\n"
 217                         "vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);\n"
 218                         "return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);\n"
 219                 "}\n"
 220                 "void main() {\n"
 221                         "vec3 tex_color = texture(tex_sampler, frag_tex_uv).rgb;\n"
 222                         "vec3 hsl_color = rgb2hsl(tex_color);\n"
 223                         "hsl_color.x += frag_hsl_mod.x;\n"
 224                         "hsl_color.y *= frag_hsl_mod.y;\n"
 225                         "hsl_color.z *= frag_hsl_mod.z;\n"
 226                         "vec3 base_color = hsl2rgb(hsl_color) * frag_rgb_mod;\n"
 227                         "vec3 ambient = ambient_color * base_color;\n"
 228                         // this should be the same as the clear color, otherwise looks really weird
 229                         "vec3 fog_color = vec3(0, 0, 0);\n"
 230                         "float e = 2.718281828;\n"
 231                         "vec3 n = normalize(normal);\n"
 232                         "vec3 l = normalize(light_direction);\n"
 233                         "float cos_theta = clamp(dot(n, l), 0, 1);\n"
 234                         "vec3 reflect_color = ambient + base_color * light_color * cos_theta;\n"
 235                         "float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
 236                         "color = mix(fog_color, reflect_color, value);\n"
 237                 "}\n"
 238         );
 239         program.Link();
 240         if (!program.Linked()) {
 241                 program.Log(std::cerr);
 242                 throw std::runtime_error("link program");
 243         }
 244
 245         m_handle = program.UniformLocation("M");
 246         mv_handle = program.UniformLocation("MV");
 247         mvp_handle = program.UniformLocation("MVP");
 248         sampler_handle = program.UniformLocation("tex_sampler");
 249         light_direction_handle = program.UniformLocation("light_direction");
 250         light_color_handle = program.UniformLocation("light_color");
 251         ambient_color_handle = program.UniformLocation("ambient_color");
 252         fog_density_handle = program.UniformLocation("fog_density");
 253
 254         Activate();
 255         program.Uniform(light_direction_handle, glm::vec3(1.0f, 3.0f, 2.0f));
 256         program.Uniform(light_color_handle, glm::vec3(1.0f));
 257         program.Uniform(ambient_color_handle, glm::vec3(0.1f));
 258         program.Uniform(fog_density_handle, 0.0f);
 259 }
 260
 261
 262 void DirectionalLighting::Activate() noexcept {
 263         program.Use();
 264 }
 265
 266 void DirectionalLighting::SetM(const glm::mat4 &m) noexcept {
 267         program.Uniform(m_handle, m);
 268         program.Uniform(mv_handle, view * m);
 269         program.Uniform(mvp_handle, vp * m);
 270 }
 271
 272 void DirectionalLighting::SetLightDirection(const glm::vec3 &dir) noexcept {
 273         program.Uniform(light_direction_handle, -dir);
 274 }
 275
 276 void DirectionalLighting::SetLightColor(const glm::vec3 &col) noexcept {
 277         program.Uniform(light_color_handle, col);
 278 }
 279
 280 void DirectionalLighting::SetAmbientColor(const glm::vec3 &col) noexcept {
 281         program.Uniform(ambient_color_handle, col);
 282 }
 283
 284 void DirectionalLighting::SetTexture(ArrayTexture &tex) noexcept {
 285         glActiveTexture(GL_TEXTURE0);
 286         tex.Bind();
 287         program.Uniform(sampler_handle, GLint(0));
 288 }
 289
 290 void DirectionalLighting::SetFogDensity(float f) noexcept {
 291         program.Uniform(fog_density_handle, f);
 292 }
 293
 294 void DirectionalLighting::SetProjection(const glm::mat4 &p) noexcept {
 295         projection = p;
 296         vp = p * view;
 297 }
 298
 299 void DirectionalLighting::SetView(const glm::mat4 &v) noexcept {
 300         view = v;
 301         vp = projection * v;
 302 }
 303
 304 void DirectionalLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 305         projection = p;
 306         view = v;
 307         vp = p * v;
 308 }
 309
 310 void DirectionalLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 311         SetVP(v, p);
 312         SetM(m);
 313 }
 314
 315
 316 BlockLighting::BlockLighting()
 317 : program()
 318 , vp(1.0f)
 319 , mv_handle(0)
 320 , mvp_handle(0)
 321 , fog_density_handle(0) {
 322         program.LoadShader(
 323                 GL_VERTEX_SHADER,
 324                 "#version 330 core\n"
 325                 "layout(location = 0) in vec3 vtx_position;\n"
 326                 "layout(location = 1) in vec3 vtx_tex_uv;\n"
 327                 "layout(location = 2) in vec3 vtx_hsl_mod;\n"
 328                 "layout(location = 3) in vec3 vtx_rgb_mod;\n"
 329                 "layout(location = 4) in float vtx_light;\n"
 330                 "uniform mat4 MV;\n"
 331                 "uniform mat4 MVP;\n"
 332                 "out vec3 frag_tex_uv;\n"
 333                 "out vec3 frag_hsl_mod;\n"
 334                 "out vec3 frag_rgb_mod;\n"
 335                 "out vec3 vtx_viewspace;\n"
 336                 "out float frag_light;\n"
 337                 "void main() {\n"
 338                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 339                         "frag_tex_uv = vtx_tex_uv;\n"
 340                         "frag_hsl_mod = vtx_hsl_mod;\n"
 341                         "frag_rgb_mod = vtx_rgb_mod;\n"
 342                         "vtx_viewspace = (MV * vec4(vtx_position, 1)).xyz;\n"
 343                         "frag_light = vtx_light;\n"
 344                 "}\n"
 345         );
 346         program.LoadShader(
 347                 GL_FRAGMENT_SHADER,
 348                 "#version 330 core\n"
 349                 "in vec3 frag_tex_uv;\n"
 350                 "in vec3 frag_hsl_mod;\n"
 351                 "in vec3 frag_rgb_mod;\n"
 352                 "in vec3 vtx_viewspace;\n"
 353                 "in float frag_light;\n"
 354                 "uniform sampler2DArray tex_sampler;\n"
 355                 "uniform float fog_density;\n"
 356                 "out vec3 color;\n"
 357                 "vec3 rgb2hsl(vec3 c) {\n"
 358                         "vec4 K = vec4(0.0, -1.0/3.0, 2.0/3.0, -1.0);\n"
 359                         "vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));\n"
 360                         "vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));\n"
 361                         "float d = q.x - min(q.w, q.y);\n"
 362                         "float e = 1.0e-10;\n"
 363                         "return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);\n"
 364                 "}\n"
 365                 "vec3 hsl2rgb(vec3 c) {\n"
 366                         "vec4 K = vec4(1.0, 2.0/3.0, 1.0/3.0, 3.0);\n"
 367                         "vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);\n"
 368                         "return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);\n"
 369                 "}\n"
 370                 "void main() {\n"
 371                         "vec3 tex_color = texture(tex_sampler, frag_tex_uv).rgb;\n"
 372                         "vec3 hsl_color = rgb2hsl(tex_color);\n"
 373                         "hsl_color.x += frag_hsl_mod.x;\n"
 374                         "hsl_color.y *= frag_hsl_mod.y;\n"
 375                         "hsl_color.z *= frag_hsl_mod.z;\n"
 376                         "vec3 base_color = hsl2rgb(hsl_color) * frag_rgb_mod;\n"
 377                         "float light_power = clamp(pow(0.8, 15 - frag_light), 0, 1);\n"
 378                         "vec3 fog_color = vec3(0, 0, 0);\n"
 379                         "float e = 2.718281828;\n"
 380                         "vec3 reflect_color = base_color * light_power;\n"
 381                         "float value = pow(e, -pow(fog_density * length(vtx_viewspace), 5));"
 382                         "color = mix(fog_color, reflect_color, value);\n"
 383                 "}\n"
 384         );
 385         program.Link();
 386         if (!program.Linked()) {
 387                 program.Log(std::cerr);
 388                 throw std::runtime_error("link program");
 389         }
 390
 391         mv_handle = program.UniformLocation("MV");
 392         mvp_handle = program.UniformLocation("MVP");
 393         sampler_handle = program.UniformLocation("tex_sampler");
 394         fog_density_handle = program.UniformLocation("fog_density");
 395 }
 396
 397
 398 void BlockLighting::Activate() noexcept {
 399         program.Use();
 400 }
 401
 402 void BlockLighting::SetTexture(ArrayTexture &tex) noexcept {
 403         glActiveTexture(GL_TEXTURE0);
 404         tex.Bind();
 405         program.Uniform(sampler_handle, GLint(0));
 406 }
 407
 408 void BlockLighting::SetFogDensity(float f) noexcept {
 409         program.Uniform(fog_density_handle, f);
 410 }
 411
 412 void BlockLighting::SetM(const glm::mat4 &m) noexcept {
 413         program.Uniform(mv_handle, view * m);
 414         program.Uniform(mvp_handle, vp * m);
 415 }
 416
 417 void BlockLighting::SetProjection(const glm::mat4 &p) noexcept {
 418         projection = p;
 419         vp = p * view;
 420 }
 421
 422 void BlockLighting::SetView(const glm::mat4 &v) noexcept {
 423         view = v;
 424         vp = projection * v;
 425 }
 426
 427 void BlockLighting::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 428         projection = p;
 429         view = v;
 430         vp = p * v;
 431 }
 432
 433 void BlockLighting::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 434         SetVP(v, p);
 435         SetM(m);
 436 }
 437
 438
 439 BlendedSprite::BlendedSprite()
 440 : program()
 441 , vp(1.0f)
 442 , mvp_handle(0)
 443 , sampler_handle(0) {
 444         program.LoadShader(
 445                 GL_VERTEX_SHADER,
 446                 "#version 330 core\n"
 447                 "layout(location = 0) in vec3 vtx_position;\n"
 448                 "layout(location = 1) in vec2 vtx_tex_uv;\n"
 449                 "uniform mat4 MVP;\n"
 450                 "out vec2 frag_tex_uv;\n"
 451                 "void main() {\n"
 452                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 453                         "frag_tex_uv = vtx_tex_uv;\n"
 454                 "}\n"
 455         );
 456         program.LoadShader(
 457                 GL_FRAGMENT_SHADER,
 458                 "#version 330 core\n"
 459                 "in vec2 frag_tex_uv;\n"
 460                 "uniform sampler2D tex_sampler;\n"
 461                 "uniform vec4 fg_factor;\n"
 462                 "uniform vec4 bg_factor;\n"
 463                 "out vec4 color;\n"
 464                 "void main() {\n"
 465                         "vec4 tex_color = texture(tex_sampler, frag_tex_uv);\n"
 466                         "vec4 factor = mix(bg_factor, fg_factor, tex_color.a);\n"
 467                         "color = tex_color * factor;\n"
 468                         "color.a = factor.a;\n"
 469                 "}\n"
 470         );
 471         program.Link();
 472         if (!program.Linked()) {
 473                 program.Log(std::cerr);
 474                 throw std::runtime_error("link program");
 475         }
 476
 477         mvp_handle = program.UniformLocation("MVP");
 478         sampler_handle = program.UniformLocation("tex_sampler");
 479         fg_handle = program.UniformLocation("fg_factor");
 480         bg_handle = program.UniformLocation("bg_factor");
 481
 482         Activate();
 483         SetFG(glm::vec4(1.0f, 1.0f, 1.0f, 1.0f));
 484         SetBG(glm::vec4(1.0f, 1.0f, 1.0f, 0.0f));
 485 }
 486
 487
 488 void BlendedSprite::Activate() noexcept {
 489         program.Use();
 490 }
 491
 492 void BlendedSprite::SetM(const glm::mat4 &m) noexcept {
 493         program.Uniform(mvp_handle, vp * m);
 494 }
 495
 496 void BlendedSprite::SetProjection(const glm::mat4 &p) noexcept {
 497         projection = p;
 498         vp = p * view;
 499 }
 500
 501 void BlendedSprite::SetView(const glm::mat4 &v) noexcept {
 502         view = v;
 503         vp = projection * v;
 504 }
 505
 506 void BlendedSprite::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 507         projection = p;
 508         view = v;
 509         vp = p * v;
 510 }
 511
 512 void BlendedSprite::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 513         SetVP(v, p);
 514         SetM(m);
 515 }
 516
 517 void BlendedSprite::SetTexture(Texture &tex) noexcept {
 518         glActiveTexture(GL_TEXTURE0);
 519         tex.Bind();
 520         program.Uniform(sampler_handle, GLint(0));
 521 }
 522
 523 void BlendedSprite::SetFG(const glm::vec4 &v) noexcept {
 524         program.Uniform(fg_handle, v);
 525 }
 526
 527 void BlendedSprite::SetBG(const glm::vec4 &v) noexcept {
 528         program.Uniform(bg_handle, v);
 529 }
 530
 531
 532 SkyBoxShader::SkyBoxShader()
 533 : program()
 534 , vp(1.0f)
 535 , vp_handle(0)
 536 , sampler_handle(0) {
 537         program.LoadShader(
 538                 GL_VERTEX_SHADER,
 539                 "#version 330 core\n"
 540                 "layout(location = 0) in vec3 vtx_position;\n"
 541                 "uniform mat4 VP;\n"
 542                 "out vec3 vtx_viewspace;\n"
 543                 "void main() {\n"
 544                         "gl_Position = VP * vec4(vtx_position, 1);\n"
 545                         "gl_Position.z = gl_Position.w;\n"
 546                         "vtx_viewspace = vtx_position;\n"
 547                 "}\n"
 548         );
 549         program.LoadShader(
 550                 GL_FRAGMENT_SHADER,
 551                 "#version 330 core\n"
 552                 "in vec3 vtx_viewspace;\n"
 553                 "uniform samplerCube tex_sampler;\n"
 554                 "out vec3 color;\n"
 555                 "void main() {\n"
 556                         "color = texture(tex_sampler, vtx_viewspace).rgb;\n"
 557                         //"color = vec3(1,0,0);\n"
 558                 "}\n"
 559         );
 560         program.Link();
 561         if (!program.Linked()) {
 562                 program.Log(std::cerr);
 563                 throw std::runtime_error("link program");
 564         }
 565
 566         vp_handle = program.UniformLocation("VP");
 567         sampler_handle = program.UniformLocation("tex_sampler");
 568 }
 569
 570
 571 void SkyBoxShader::Activate() noexcept {
 572         program.Use();
 573 }
 574
 575 void SkyBoxShader::SetTexture(CubeMap &tex) noexcept {
 576         glActiveTexture(GL_TEXTURE0);
 577         tex.Bind();
 578         program.Uniform(sampler_handle, GLint(0));
 579 }
 580
 581 void SkyBoxShader::SetProjection(const glm::mat4 &p) noexcept {
 582         projection = p;
 583         vp = p * view;
 584         program.Uniform(vp_handle, vp);
 585 }
 586
 587 void SkyBoxShader::SetView(const glm::mat4 &v) noexcept {
 588         view = v;
 589         view[0].w = 0.0f;
 590         view[1].w = 0.0f;
 591         view[2].w = 0.0f;
 592         view[3] = glm::vec4(0.0f, 0.0f, 0.0f, 1.0f);
 593         vp = projection * view;
 594         program.Uniform(vp_handle, vp);
 595 }
 596
 597 void SkyBoxShader::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 598         projection = p;
 599         SetView(v);
 600 }
 601
 602
 603 PlainColor::PlainColor()
 604 : program()
 605 , vp(1.0f)
 606 , mvp_handle(0) {
 607         program.LoadShader(
 608                 GL_VERTEX_SHADER,
 609                 "#version 330 core\n"
 610                 "layout(location = 0) in vec3 vtx_position;\n"
 611                 "layout(location = 1) in vec4 vtx_color;\n"
 612                 "uniform mat4 MVP;\n"
 613                 "out vec4 frag_color;\n"
 614                 "void main() {\n"
 615                         "gl_Position = MVP * vec4(vtx_position, 1);\n"
 616                         "frag_color = vtx_color;\n"
 617                 "}\n"
 618         );
 619         program.LoadShader(
 620                 GL_FRAGMENT_SHADER,
 621                 "#version 330 core\n"
 622                 "in vec4 frag_color;\n"
 623                 "out vec4 color;\n"
 624                 "void main() {\n"
 625                         "color = frag_color;\n"
 626                 "}\n"
 627         );
 628         program.Link();
 629         if (!program.Linked()) {
 630                 program.Log(std::cerr);
 631                 throw std::runtime_error("link program");
 632         }
 633
 634         mvp_handle = program.UniformLocation("MVP");
 635 }
 636
 637
 638 void PlainColor::Activate() noexcept {
 639         program.Use();
 640 }
 641
 642 void PlainColor::SetM(const glm::mat4 &m) noexcept {
 643         program.Uniform(mvp_handle, vp * m);
 644 }
 645
 646 void PlainColor::SetProjection(const glm::mat4 &p) noexcept {
 647         projection = p;
 648         vp = p * view;
 649 }
 650
 651 void PlainColor::SetView(const glm::mat4 &v) noexcept {
 652         view = v;
 653         vp = projection * v;
 654 }
 655
 656 void PlainColor::SetVP(const glm::mat4 &v, const glm::mat4 &p) noexcept {
 657         projection = p;
 658         view = v;
 659         vp = p * v;
 660 }
 661
 662 void PlainColor::SetMVP(const glm::mat4 &m, const glm::mat4 &v, const glm::mat4 &p) noexcept {
 663         SetVP(v, p);
 664         SetM(m);
 665 }
 666
 667 }