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
  15 #include "context.h"
  16 #include "mixer.h"
  17 #include "ref_counted_gl_sync.h"
  18
  19 class QSurface;
  20 class QWidget;
  21
  22 #undef Success
  23 #include <movit/util.h>
  24 #include <string>
  25
  26 GLWidget::GLWidget(QWidget *parent)
  27     : QGLWidget(parent, global_share_widget),
  28       resource_pool(new movit::ResourcePool)
  29 {
  30 }
  31
  32 GLWidget::~GLWidget()
  33 {
  34 }
  35
  36 void GLWidget::initializeGL()
  37 {
  38         printf("egl context=%p\n", eglGetCurrentContext());
  39         //printf("threads: %p %p\n", QThread::currentThread(), qGuiApp->thread());
  40
  41         GLWidget *t = this;
  42         global_mixer->set_frame_ready_fallback([t]{
  43                 QMetaObject::invokeMethod(t, "update", Qt::AutoConnection);
  44         });
  45
  46         QSurfaceFormat fmt = QGLFormat::toSurfaceFormat(format());
  47         QSurface *surface = create_surface(fmt);
  48         QSurface *surface2 = create_surface(fmt);
  49         QSurface *surface3 = create_surface(fmt);
  50         QSurface *surface4 = create_surface(fmt);
  51         global_mixer = new Mixer;
  52         global_mixer->start(surface, surface2, surface3, surface4);
  53
  54         // Prepare the shaders to actually get the texture shown (ick).
  55         glDisable(GL_BLEND);
  56         glDisable(GL_DEPTH_TEST);
  57         glDepthMask(GL_FALSE);
  58
  59         std::string vert_shader =
  60                 "#version 130 \n"
  61                 "in vec2 position; \n"
  62                 "in vec2 texcoord; \n"
  63                 "out vec2 tc; \n"
  64                 " \n"
  65                 "void main() \n"
  66                 "{ \n"
  67                 "    gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
  68                 "    tc = texcoord; \n"
  69                 "    tc.y = 1.0 - tc.y; \n"
  70                 "} \n";
  71         std::string frag_shader =
  72                 "#version 130 \n"
  73                 "in vec2 tc; \n"
  74                 "uniform sampler2D tex; \n"
  75                 "void main() { \n"
  76                 "    gl_FragColor = texture2D(tex, tc); \n"
  77                 "} \n";
  78         program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader);
  79
  80         static const float vertices[] = {
  81                 0.0f, 2.0f,
  82                 0.0f, 0.0f,
  83                 2.0f, 0.0f
  84         };
  85         glGenVertexArrays(1, &vao);
  86         glBindVertexArray(vao);
  87         position_vbo = movit::fill_vertex_attribute(program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
  88         texcoord_vbo = movit::fill_vertex_attribute(program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
  89
  90 #if 0
  91         // Cleanup.
  92         cleanup_vertex_attribute(phases[0]->glsl_program_num, "position", position_vbo);
  93         cleanup_vertex_attribute(phases[0]->glsl_program_num, "texcoord", texcoord_vbo);
  94
  95         glDeleteVertexArrays(1, &vao);
  96         nheck_error();
  97 #endif
  98 }
  99
 100 void GLWidget::resizeGL(int width, int height)
 101 {
 102         glViewport(0, 0, width, height);
 103 }
 104
 105 void GLWidget::paintGL()
 106 {
 107         Mixer::DisplayFrame frame;
 108         if (!global_mixer->get_display_frame(&frame)) {
 109                 glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
 110                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 111                 return;
 112         }
 113
 114         glUseProgram(program_num);
 115         glActiveTexture(GL_TEXTURE0);
 116         glBindTexture(GL_TEXTURE_2D, frame.texnum);
 117         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 118         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 119         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 120
 121         glBindVertexArray(vao);
 122         glWaitSync(frame.ready_fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
 123         glDrawArrays(GL_TRIANGLES, 0, 3);
 124 }