git.sesse.net Git - nageru/blob - glwidget.cpp

   1 #include <qmetatype.h>
   2 #include <qdatastream.h>
   3 #include <qtextstream.h>
   4 #include <qcursor.h>
   5 #include <qcoreevent.h>
   6 #include <epoxy/gl.h>
   7 #include <epoxy/egl.h>
   8 #include "context.h"
   9 #include "glwidget.h"
  10 #include "mixer.h"
  11 #include <QCoreApplication>
  12 #include <QGuiApplication>
  13 #include <QThread>
  14 #include <math.h>
  15 #include <thread>
  16 #include <movit/resource_pool.h>
  17 #undef Success
  18 #include <movit/util.h>
  19
  20 GLWidget::GLWidget(QWidget *parent)
  21     : QOpenGLWidget(parent),
  22       resource_pool(new movit::ResourcePool)
  23 {
  24 }
  25
  26 GLWidget::~GLWidget()
  27 {
  28 }
  29
  30 void GLWidget::initializeGL()
  31 {
  32         printf("egl context=%p\n", eglGetCurrentContext());
  33         //printf("threads: %p %p\n", QThread::currentThread(), qGuiApp->thread());
  34
  35         GLWidget *t = this;
  36         set_frame_ready_fallback([t]{
  37                 QMetaObject::invokeMethod(t, "update", Qt::AutoConnection);
  38         });
  39
  40         QSurface *surface = create_surface(format());
  41         QSurface *surface2 = create_surface(format());
  42         QSurface *surface3 = create_surface(format());
  43         QSurface *surface4 = create_surface(format());
  44         start_mixer(surface, surface2, surface3, surface4);
  45
  46         // Prepare the shaders to actually get the texture shown (ick).
  47         glDisable(GL_BLEND);
  48         glDisable(GL_DEPTH_TEST);
  49         glDepthMask(GL_FALSE);
  50
  51         std::string vert_shader =
  52                 "#version 130 \n"
  53                 "in vec2 position; \n"
  54                 "in vec2 texcoord; \n"
  55                 "out vec2 tc; \n"
  56                 " \n"
  57                 "void main() \n"
  58                 "{ \n"
  59                 "    gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
  60                 "    tc = texcoord; \n"
  61                 "    tc.y = 1.0 - tc.y; \n"
  62                 "} \n";
  63         std::string frag_shader =
  64                 "#version 130 \n"
  65                 "in vec2 tc; \n"
  66                 "uniform sampler2D tex; \n"
  67                 "void main() { \n"
  68                 "    gl_FragColor = texture2D(tex, tc); \n"
  69                 "} \n";
  70         program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader);
  71
  72         static const float vertices[] = {
  73                 0.0f, 2.0f,
  74                 0.0f, 0.0f,
  75                 2.0f, 0.0f
  76         };
  77         glGenVertexArrays(1, &vao);
  78         glBindVertexArray(vao);
  79         position_vbo = movit::fill_vertex_attribute(program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
  80         texcoord_vbo = movit::fill_vertex_attribute(program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
  81
  82 #if 0
  83         // Cleanup.
  84         cleanup_vertex_attribute(phases[0]->glsl_program_num, "position", position_vbo);
  85         cleanup_vertex_attribute(phases[0]->glsl_program_num, "texcoord", texcoord_vbo);
  86
  87         glDeleteVertexArrays(1, &vao);
  88         nheck_error();
  89 #endif
  90 }
  91
  92 void GLWidget::paintGL()
  93 {
  94         DisplayFrame frame;
  95         if (!mixer_get_display_frame(&frame)) {
  96                 glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
  97                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  98                 return;
  99         }
 100
 101         glUseProgram(program_num);
 102         glActiveTexture(GL_TEXTURE0);
 103         glBindTexture(GL_TEXTURE_2D, frame.texnum);
 104         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 105         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 106         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 107
 108         glBindVertexArray(vao);
 109         glWaitSync(frame.ready_fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
 110         glDrawArrays(GL_TRIANGLES, 0, 3);
 111 }