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         global_mixer = new Mixer(QGLFormat::toSurfaceFormat(format()));
  42         global_mixer->set_frame_ready_fallback([this]{
  43                 QMetaObject::invokeMethod(this, "update", Qt::AutoConnection);
  44         });
  45         global_mixer->start();
  46
  47         // Prepare the shaders to actually get the texture shown (ick).
  48         glDisable(GL_BLEND);
  49         glDisable(GL_DEPTH_TEST);
  50         glDepthMask(GL_FALSE);
  51
  52         std::string vert_shader =
  53                 "#version 130 \n"
  54                 "in vec2 position; \n"
  55                 "in vec2 texcoord; \n"
  56                 "out vec2 tc; \n"
  57                 " \n"
  58                 "void main() \n"
  59                 "{ \n"
  60                 "    gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
  61                 "    tc = texcoord; \n"
  62                 "    tc.y = 1.0 - tc.y; \n"
  63                 "} \n";
  64         std::string frag_shader =
  65                 "#version 130 \n"
  66                 "in vec2 tc; \n"
  67                 "uniform sampler2D tex; \n"
  68                 "void main() { \n"
  69                 "    gl_FragColor = texture2D(tex, tc); \n"
  70                 "} \n";
  71         program_num = resource_pool->compile_glsl_program(vert_shader, frag_shader);
  72
  73         static const float vertices[] = {
  74                 0.0f, 2.0f,
  75                 0.0f, 0.0f,
  76                 2.0f, 0.0f
  77         };
  78         glGenVertexArrays(1, &vao);
  79         glBindVertexArray(vao);
  80         position_vbo = movit::fill_vertex_attribute(program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
  81         texcoord_vbo = movit::fill_vertex_attribute(program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
  82
  83 #if 0
  84         // Cleanup.
  85         cleanup_vertex_attribute(phases[0]->glsl_program_num, "position", position_vbo);
  86         cleanup_vertex_attribute(phases[0]->glsl_program_num, "texcoord", texcoord_vbo);
  87
  88         glDeleteVertexArrays(1, &vao);
  89         nheck_error();
  90 #endif
  91 }
  92
  93 void GLWidget::resizeGL(int width, int height)
  94 {
  95         glViewport(0, 0, width, height);
  96 }
  97
  98 void GLWidget::paintGL()
  99 {
 100         Mixer::DisplayFrame frame;
 101         if (!global_mixer->get_display_frame(&frame)) {
 102                 glClearColor(0.0f, 1.0f, 0.0f, 1.0f);
 103                 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 104                 return;
 105         }
 106
 107         glUseProgram(program_num);
 108         glActiveTexture(GL_TEXTURE0);
 109         glBindTexture(GL_TEXTURE_2D, frame.texnum);
 110         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 111         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 112         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 113
 114         glBindVertexArray(vao);
 115         glWaitSync(frame.ready_fence.get(), /*flags=*/0, GL_TIMEOUT_IGNORED);
 116         glDrawArrays(GL_TRIANGLES, 0, 3);
 117 }