kc3-lang/angle/samples/gles1/SimpleTexture2D.cpp

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• Author : Lingfeng Yang
  Date : 2018-04-23 09:02:09
  Hash : 461b09a8
  Message : GLES1: Renderer (minimal) This is the renderer code for GLES1 that delivers basic vertex attributes, matrices, and allows texturing for unit 0 only (more units mean implementing the multitexturing pipeline). + Sample + Update test expectations for GLES1 conformance tests BUG=angleproject:2554 BUG=angleproject:2306 Change-Id: I398edc764f982fbfc4c5e0f9d6bfef1e91aec47c Reviewed-on: https://chromium-review.googlesource.com/1057356 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Lingfeng Yang <lfy@google.com>

• samples/gles1/SimpleTexture2D.cpp

• //
  // Copyright 2018 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  //            Based on Simple_Texture2D.c from
  // Book:      OpenGL(R) ES 2.0 Programming Guide
  // Authors:   Aaftab Munshi, Dan Ginsburg, Dave Shreiner
  // ISBN-10:   0321502795
  // ISBN-13:   9780321502797
  // Publisher: Addison-Wesley Professional
  // URLs:      http://safari.informit.com/9780321563835
  //            http://www.opengles-book.com
  
  #include "SampleApplication.h"
  #include "shader_utils.h"
  #include "texture_utils.h"
  
  #include <GLES/gl.h>
  
  class GLES1SimpleTexture2DSample : public SampleApplication
  {
    public:
      GLES1SimpleTexture2DSample(EGLint displayType)
          : SampleApplication("GLES1SimpleTexture2D", 1280, 720, 1, 0, displayType)
      {
      }
  
      bool initialize() override
      {
          // Load the texture
          mTexture = CreateSimpleTexture2D();
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
          glEnable(GL_TEXTURE_2D);
  
          return true;
      }
  
      void destroy() override { glDeleteTextures(1, &mTexture); }
  
      void draw() override
      {
          GLfloat vertices[] = {
              -0.5f, 0.5f,  0.0f,  // Position 0
              0.0f,  0.0f,         // TexCoord 0
              -0.5f, -0.5f, 0.0f,  // Position 1
              0.0f,  1.0f,         // TexCoord 1
              0.5f,  -0.5f, 0.0f,  // Position 2
              1.0f,  1.0f,         // TexCoord 2
              0.5f,  0.5f,  0.0f,  // Position 3
              1.0f,  0.0f          // TexCoord 3
          };
          GLushort indices[] = {0, 1, 2, 0, 2, 3};
  
          // Set the viewport
          glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
  
          // Clear the color buffer
          glClear(GL_COLOR_BUFFER_BIT);
  
          // Load the vertex position
          glVertexPointer(3, GL_FLOAT, 5 * sizeof(GLfloat), vertices);
          // Load the texture coordinate
          glTexCoordPointer(2, GL_FLOAT, 5 * sizeof(GLfloat), vertices + 3);
  
          glEnableClientState(GL_VERTEX_ARRAY);
          glEnableClientState(GL_TEXTURE_COORD_ARRAY);
  
          // Bind the texture
          glActiveTexture(GL_TEXTURE0);
          glBindTexture(GL_TEXTURE_2D, mTexture);
  
          glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
      }
  
    private:
      // Texture handle
      GLuint mTexture = 0;
  };
  
  int main(int argc, char **argv)
  {
      EGLint displayType = EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE;
  
      if (argc > 1)
      {
          displayType = GetDisplayTypeFromArg(argv[1]);
      }
  
      GLES1SimpleTexture2DSample app(displayType);
      return app.run();
  }