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

   1 #include <qmetatype.h>  // Needs to come before egl.h.
   2 #include <qdatastream.h>  // Needs to come before egl.h.
   3 #include <qtextstream.h>  // Needs to come before egl.h.
   4 #include <qcursor.h>  // Needs to come before egl.h.
   5 #include <qcoreevent.h>  // Needs to come before egl.h.
   6 #include <epoxy/gl.h>
   7 #include <epoxy/egl.h>
   8 #include <QSurfaceFormat>
   9
  10 #include "glwidget.h"
  11
  12 #include <movit/resource_pool.h>
  13 #include <stdio.h>
  14 #include <mutex>
  15
  16 #include "context.h"
  17 #include "mixer.h"
  18 #include "ref_counted_gl_sync.h"
  19
  20 class QSurface;
  21 class QWidget;
  22
  23 #undef Success
  24 #include <movit/util.h>
  25 #include <string>
  26
  27 GLWidget::GLWidget(QWidget *parent)
  28     : QGLWidget(parent, global_share_widget),
  29       resource_pool(new movit::ResourcePool)
  30 {
  31 }
  32
  33 GLWidget::~GLWidget()
  34 {
  35 }
  36
  37 void GLWidget::initializeGL()
  38 {
  39         printf("egl context=%p\n", eglGetCurrentContext());
  40         //printf("threads: %p %p\n", QThread::currentThread(), qGuiApp->thread());
  41
  42         static std::once_flag flag;
  43         std::call_once(flag, [this]{
  44                 global_mixer = new Mixer(QGLFormat::toSurfaceFormat(format()));
  45                 global_mixer->start();
  46         });
  47         global_mixer->set_frame_ready_callback(output, [this]{
  48                 QMetaObject::invokeMethod(this, "update", Qt::AutoConnection);
  49         });
  50
  51         // Prepare the shaders to actually get the texture shown (ick).
  52         glDisable(GL_BLEND);
  53         glDisable(GL_DEPTH_TEST);
  54         glDepthMask(GL_FALSE);
  55
  56         std::string vert_shader =
  57                 "#version 130 \n"
  58                 "in vec2 position; \n"
  59                 "in vec2 texcoord; \n"
  60                 "out vec2 tc; \n"
  61                 " \n"
  62                 "void main() \n"
  63                 "{ \n"
  64                 "    gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
  65                 "    tc = texcoord; \n"
  66                 "    tc.y = 1.0 - tc.y; \n"
  67                 "} \n";
  68         std::string frag_shader =
  69                 "#version 130 \n"
  70                 "in vec2 tc; \n"
  71                 "uniform sampler2D tex; \n"
  72                 "void main() { \n"
  73                 "    gl_FragColor = texture2D(tex, tc); \n"
  74                 "} \n";
  75         program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader);
  76
  77         static const float vertices[] = {
  78                 0.0f, 2.0f,
  79                 0.0f, 0.0f,
  80                 2.0f, 0.0f
  81         };
  82         glGenVertexArrays(1, &vao);
  83         glBindVertexArray(vao);
  84         position_vbo = movit::fill_vertex_attribute(program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
  85         texcoord_vbo = movit::fill_vertex_attribute(program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
  86
  87 #if 0
  88         // Cleanup.
  89         cleanup_vertex_attribute(phases[0]->glsl_program_num, "position", position_vbo);
  90         cleanup_vertex_attribute(phases[0]->glsl_program_num, "texcoord", texcoord_vbo);
  91
  92         glDeleteVertexArrays(1, &vao);
  93         nheck_error();
  94 #endif
  95 }
  96
  97 void GLWidget::resizeGL(int width, int height)
  98 {
  99         glViewport(0, 0, width, height);
 100         global_mixer->set_preview_size(output, width, height);
 101 }
 102
 103 void GLWidget::paintGL()
 104 {
 105         Mixer::DisplayFrame frame;
 106         if (!global_mixer->get_display_frame(output, &frame)) {
 107                 glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
 108                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 109                 return;
 110         }
 111
 112         glUseProgram(program_num);
 113         glActiveTexture(GL_TEXTURE0);
 114         glBindTexture(GL_TEXTURE_2D, frame.texnum);
 115         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 116         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 117         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 118
 119         glBindVertexArray(vao);
 120         glWaitSync(frame.ready_fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
 121         glDrawArrays(GL_TRIANGLES, 0, 3);
 122 }