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      1 /* Copyright 2016 The TensorFlow Authors. All Rights Reserved.
      2 
      3 Licensed under the Apache License, Version 2.0 (the "License");
      4 you may not use this file except in compliance with the License.
      5 You may obtain a copy of the License at
      6 
      7     http://www.apache.org/licenses/LICENSE-2.0
      8 
      9 Unless required by applicable law or agreed to in writing, software
     10 distributed under the License is distributed on an "AS IS" BASIS,
     11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 See the License for the specific language governing permissions and
     13 limitations under the License.
     14 ==============================================================================*/
     15 
     16 #ifndef TENSORFLOW_EXAMPLES_ANDROID_JNI_OBJECT_TRACKING_GL_UTILS_H_
     17 #define TENSORFLOW_EXAMPLES_ANDROID_JNI_OBJECT_TRACKING_GL_UTILS_H_
     18 
     19 #include <GLES/gl.h>
     20 #include <GLES/glext.h>
     21 
     22 #include "tensorflow/examples/android/jni/object_tracking/geom.h"
     23 
     24 namespace tf_tracking {
     25 
     26 // Draws a box at the given position.
     27 inline static void DrawBox(const BoundingBox& bounding_box) {
     28   const GLfloat line[] = {
     29       bounding_box.left_, bounding_box.bottom_,
     30       bounding_box.left_, bounding_box.top_,
     31       bounding_box.left_, bounding_box.top_,
     32       bounding_box.right_, bounding_box.top_,
     33       bounding_box.right_, bounding_box.top_,
     34       bounding_box.right_, bounding_box.bottom_,
     35       bounding_box.right_, bounding_box.bottom_,
     36       bounding_box.left_, bounding_box.bottom_
     37   };
     38 
     39   glVertexPointer(2, GL_FLOAT, 0, line);
     40   glEnableClientState(GL_VERTEX_ARRAY);
     41 
     42   glDrawArrays(GL_LINES, 0, 8);
     43 }
     44 
     45 
     46 // Changes the coordinate system such that drawing to an arbitrary square in
     47 // the world can thereafter be drawn to using coordinates 0 - 1.
     48 inline static void MapWorldSquareToUnitSquare(const BoundingSquare& square) {
     49   glScalef(square.size_, square.size_, 1.0f);
     50   glTranslatef(square.x_ / square.size_, square.y_ / square.size_, 0.0f);
     51 }
     52 
     53 }  // namespace tf_tracking
     54 
     55 #endif  // TENSORFLOW_EXAMPLES_ANDROID_JNI_OBJECT_TRACKING_GL_UTILS_H_
     56