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      1 /*
      2  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include "webrtc/test/gl/gl_renderer.h"
     12 
     13 #include <string.h>
     14 
     15 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
     16 
     17 namespace webrtc {
     18 namespace test {
     19 
     20 GlRenderer::GlRenderer()
     21     : is_init_(false), buffer_(NULL), width_(0), height_(0) {}
     22 
     23 void GlRenderer::Init() {
     24   assert(!is_init_);
     25   is_init_ = true;
     26 
     27   glGenTextures(1, &texture_);
     28 }
     29 
     30 void GlRenderer::Destroy() {
     31   if (!is_init_) {
     32     return;
     33   }
     34 
     35   is_init_ = false;
     36 
     37   delete[] buffer_;
     38   buffer_ = NULL;
     39 
     40   glDeleteTextures(1, &texture_);
     41 }
     42 
     43 void GlRenderer::ResizeViewport(size_t width, size_t height) {
     44   // TODO(pbos): Aspect ratio, letterbox the video.
     45   glViewport(0, 0, width, height);
     46 
     47   glMatrixMode(GL_PROJECTION);
     48   glLoadIdentity();
     49   glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
     50   glOrtho(0.0f, 1.0f, 1.0f, 0.0f, -1.0f, 1.0f);
     51   glMatrixMode(GL_MODELVIEW);
     52 }
     53 
     54 void GlRenderer::ResizeVideo(size_t width, size_t height) {
     55   assert(is_init_);
     56   width_ = width;
     57   height_ = height;
     58 
     59   buffer_size_ = width * height * 4;  // BGRA
     60 
     61   delete[] buffer_;
     62   buffer_ = new uint8_t[buffer_size_];
     63   assert(buffer_ != NULL);
     64   memset(buffer_, 0, buffer_size_);
     65   glBindTexture(GL_TEXTURE_2D, texture_);
     66   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
     67   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
     68   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_BGRA,
     69                GL_UNSIGNED_INT_8_8_8_8, static_cast<GLvoid*>(buffer_));
     70 }
     71 
     72 void GlRenderer::RenderFrame(const webrtc::I420VideoFrame& frame,
     73                              int /*render_delay_ms*/) {
     74   assert(is_init_);
     75 
     76   if (static_cast<size_t>(frame.width()) != width_ ||
     77       static_cast<size_t>(frame.height()) != height_) {
     78     ResizeVideo(frame.width(), frame.height());
     79   }
     80 
     81   webrtc::ConvertFromI420(frame, kBGRA, 0, buffer_);
     82 
     83   glEnable(GL_TEXTURE_2D);
     84   glBindTexture(GL_TEXTURE_2D, texture_);
     85   glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width_, height_, GL_BGRA,
     86                   GL_UNSIGNED_INT_8_8_8_8, buffer_);
     87 
     88   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     89 
     90   glLoadIdentity();
     91 
     92   glBegin(GL_QUADS);
     93   {
     94     glTexCoord2f(0.0f, 0.0f);
     95     glVertex3f(0.0f, 0.0f, 0.0f);
     96 
     97     glTexCoord2f(0.0f, 1.0f);
     98     glVertex3f(0.0f, 1.0f, 0.0f);
     99 
    100     glTexCoord2f(1.0f, 1.0f);
    101     glVertex3f(1.0f, 1.0f, 0.0f);
    102 
    103     glTexCoord2f(1.0f, 0.0f);
    104     glVertex3f(1.0f, 0.0f, 0.0f);
    105   }
    106   glEnd();
    107 
    108   glBindTexture(GL_TEXTURE_2D, 0);
    109   glFlush();
    110 }
    111 }  // test
    112 }  // webrtc
    113