<?phpnamespace App\Scene;use JumPHP\Audio\Synth;use JumPHP\Gl\Mat4;use JumPHP\Gl\OpenGl;use JumPHP\Renderer\Renderer;use JumPHP\Scene\AbstractScene;/** * Raw OpenGL: the PHP-OpenGL functions themselves (glUseProgram, glBindBuffer, glDrawArrays...) between * OpenGl::begin() and end(), in the same GL context as SDL's 2D (WebGL in the browser), and a positional * sound with OpenAL (Audio3d): the beeping cube is heard where it is, left or right. */final class RawGlScene extends AbstractScene{ private const VERTEX = <<<'GLSL' attribute vec3 a_pos; attribute vec3 a_normal; uniform mat4 u_mvp; uniform mat4 u_model; varying vec3 v_normal; varying vec3 v_pos; void main() { v_normal = (u_model * vec4(a_normal, 0.0)).xyz; v_pos = (u_model * vec4(a_pos, 1.0)).xyz; gl_Position = u_mvp * vec4(a_pos, 1.0); } GLSL; // per-pixel light: diffuse + specular, a rim of colour private const FRAGMENT = <<<'GLSL' precision mediump float; uniform vec3 u_color; uniform vec3 u_eye; varying vec3 v_normal; varying vec3 v_pos; void main() { vec3 n = normalize(v_normal); vec3 l = normalize(vec3(0.6, 1.0, 0.4)); vec3 v = normalize(u_eye - v_pos); float diffuse = max(dot(n, l), 0.0); float specular = pow(max(dot(reflect(-l, n), v), 0.0), 24.0); float rim = pow(1.0 - max(dot(n, v), 0.0), 3.0); gl_FragColor = vec4(u_color * (0.18 + 0.82 * diffuse) + vec3(specular) + vec3(0.3, 0.5, 1.0) * rim, 1.0); } GLSL; private float $time = 0.0; private int $program = 0; private int $torus = 0; private int $torusCount = 0; private int $cube = 0; private int $voice = 0; public function enter(array $params = []): void { $this->time = 0.0; $this->engine->gl()->disable(); // this scene draws its 3D itself $gl = $this->engine->opengl(); if ($gl->isAvailable() && $this->program === 0) { $this->program = $gl->program(self::VERTEX, self::FRAGMENT, ['a_pos' => 0, 'a_normal' => 1]); $torus = self::torus(1.0, 0.38, 48, 20); $this->torusCount = intdiv(count($torus), 6); $this->torus = $gl->buffer($torus); $this->cube = $gl->buffer(self::cube()); } $audio = $this->engine->audio3d(); if ($audio->isAvailable() && !$audio->has('beep')) { $audio->synth('beep', Synth::sequence([[880, 0.08], [0, 0.25], [660, 0.08], [0, 0.25]], 'triangle')); } $this->voice = $audio->play('beep', [0, 0, -4], 0.8, 1.0, true); } public function exit(): void { $this->engine->audio3d()->stop($this->voice); } public function update(float $dt): void { if ($this->actions()->isPressed('back') || $this->actions()->isPressed('next')) { $this->scenes()->switchTo(TitleScene::class); return; } $this->time += $dt; // the listener at the camera, the sound on the orbiting cube $audio = $this->engine->audio3d(); $audio->listener([0, 1.5, 5], [0, -0.3, -1]); $audio->move($this->voice, $this->cubePosition()); } /** @return float[] */ private function cubePosition(): array { return [cos($this->time * 1.2) * 3.0, 0.4, sin($this->time * 1.2) * 3.0]; } public function render(Renderer $r): void { $gl = $this->engine->opengl(); $r->clear([8, 10, 26]); if ($gl->begin([8, 10, 26, 255])) { $this->draw3d($gl); $gl->end(); } else { $this->font()->draw($r, "NO OPENGL HERE\n(HEADLESS RUN)", $this->width() / 2, 70, 1, [255, 120, 120], 'center'); } $font = $this->font(); $r->fillRect(0, 0, $this->width(), 11, [0, 0, 0]); $font->draw($r, 'RAW OPENGL + OPENAL', 3, 2, 1, [255, 210, 63]); $sound = $this->engine->audio3d()->isAvailable() ? 'SOUND: 3D' : 'SOUND: NONE'; $font->draw($r, $sound, $this->width() - 3, 2, 1, [200, 220, 255], 'right'); $font->draw($r, 'THE BEEP COMES FROM THE CUBE ' . $this->actions()->label('next') . ' BACK', $this->width() / 2, $this->height() - 9, 1, [150, 150, 180], 'center'); } private function draw3d(OpenGl $gl): void { [$w, $h] = $gl->targetSize(); $eye = [0.0, 1.5, 5.0]; $viewProj = Mat4::multiply(Mat4::perspective(55, $w / $h, 0.1, 50), Mat4::lookAt($eye, [0, 0, 0])); glUseProgram($this->program); $mvp = glGetUniformLocation($this->program, 'u_mvp'); $model = glGetUniformLocation($this->program, 'u_model'); $color = glGetUniformLocation($this->program, 'u_color'); glUniform3f(glGetUniformLocation($this->program, 'u_eye'), ...$eye); glEnable(GL_CULL_FACE); glCullFace(GL_BACK); $objects = [ [$this->torus, $this->torusCount, Mat4::multiply(Mat4::rotateY($this->time * 0.7), Mat4::rotateX($this->time * 1.1)), [1.0, 0.45, 0.3]], [$this->cube, 36, Mat4::multiply(Mat4::translate(...$this->cubePosition()), Mat4::rotateY($this->time * 3), Mat4::scale(0.5)), [0.4, 1.0, 0.6]], ]; foreach ($objects as [$buffer, $count, $m, $rgb]) { glBindBuffer(GL_ARRAY_BUFFER, $buffer); glEnableVertexAttribArray(0); glVertexAttribPointer(0, 3, GL_FLOAT, 0, 24, 0); glEnableVertexAttribArray(1); glVertexAttribPointer(1, 3, GL_FLOAT, 0, 24, 12); glUniformMatrix4fv($mvp, 1, false, Mat4::multiply($viewProj, $m)); glUniformMatrix4fv($model, 1, false, $m); glUniform3f($color, ...$rgb); glDrawArrays(GL_TRIANGLES, 0, $count); } glDisableVertexAttribArray(0); glDisableVertexAttribArray(1); } /** A torus: position + normal per vertex. @return float[] */ private static function torus(float $major, float $minor, int $segments, int $sides): array { $point = function (int $i, int $j) use ($major, $minor, $segments, $sides): array { $u = 2 * M_PI * $i / $segments; $v = 2 * M_PI * $j / $sides; $n = [cos($v) * cos($u), sin($v), cos($v) * sin($u)]; return [($major + $minor * cos($v)) * cos($u), $minor * sin($v), ($major + $minor * cos($v)) * sin($u), ...$n]; }; $out = []; for ($i = 0; $i < $segments; $i++) { for ($j = 0; $j < $sides; $j++) { $q = [$point($i, $j), $point($i + 1, $j), $point($i + 1, $j + 1), $point($i, $j + 1)]; foreach ([0, 2, 1, 0, 3, 2] as $k) { array_push($out, ...$q[$k]); } } } return $out; } /** A cube of size 1: position + normal. @return float[] */ private static function cube(): array { $out = []; foreach ([[0, 1], [0, -1], [1, 1], [1, -1], [2, 1], [2, -1]] as [$axis, $sign]) { $n = [0, 0, 0]; $n[$axis] = $sign; $corner = function (float $a, float $b) use ($axis, $sign): array { $p = [0.0, 0.0, 0.0]; $p[$axis] = 0.5 * $sign; $p[($axis + 1) % 3] = $a * $sign; $p[($axis + 2) % 3] = $b; return $p; }; foreach ([[-0.5, -0.5], [0.5, -0.5], [0.5, 0.5], [-0.5, -0.5], [0.5, 0.5], [-0.5, 0.5]] as [$a, $b]) { array_push($out, ...$corner($a, $b), ...$n); } } return $out; }}