kc3-lang/angle/samples/simple_texture_cubemap

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• Author : Jamie Madill
  Date : 2018-12-02 12:03:33
  Hash : 35cd7332
  Message : Refactor test shader style. This change enforces a lot more consistency. We pass const char * to the Compile functions instead of std::string. Also fixes the indentation of C++11 block comments to be more consistent. Bug: angleproject:2995 Change-Id: Id6e5ea94055d8cbd420df4ea2e81b2d96cb5ce78 Reviewed-on: https://chromium-review.googlesource.com/c/1357103 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• SimpleTextureCubemap.cpp

• //
  // Copyright (c) 2014 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_TextureCubemap.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 "texture_utils.h"
  #include "util/geometry_utils.h"
  #include "util/shader_utils.h"
  
  class SimpleTextureCubemapSample : public SampleApplication
  {
    public:
      SimpleTextureCubemapSample(int argc, char **argv)
          : SampleApplication("SimpleTextureCubemap", argc, argv)
      {}
  
      bool initialize() override
      {
          constexpr char kVS[] = R"(attribute vec4 a_position;
  attribute vec3 a_normal;
  varying vec3 v_normal;
  void main()
  {
      gl_Position = a_position;
      v_normal = a_normal;
  })";
  
          constexpr char kFS[] = R"(precision mediump float;
  varying vec3 v_normal;
  uniform samplerCube s_texture;
  void main()
  {
      gl_FragColor = textureCube(s_texture, v_normal);
  })";
  
          mProgram = CompileProgram(kVS, kFS);
          if (!mProgram)
          {
              return false;
          }
  
          // Get the attribute locations
          mPositionLoc = glGetAttribLocation(mProgram, "a_position");
          mNormalLoc   = glGetAttribLocation(mProgram, "a_normal");
  
          // Get the sampler locations
          mSamplerLoc = glGetUniformLocation(mProgram, "s_texture");
  
          // Load the texture
          mTexture = CreateSimpleTextureCubemap();
  
          // Generate the geometry data
          CreateSphereGeometry(128, 0.75f, &mSphere);
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
          glCullFace(GL_BACK);
          glEnable(GL_CULL_FACE);
  
          return true;
      }
  
      void destroy() override
      {
          glDeleteProgram(mProgram);
          glDeleteTextures(1, &mTexture);
      }
  
      void draw() override
      {
          // Set the viewport
          glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
  
          // Clear the color buffer
          glClear(GL_COLOR_BUFFER_BIT);
  
          // Use the program object
          glUseProgram(mProgram);
  
          // Load the vertex position
          glVertexAttribPointer(mPositionLoc, 3, GL_FLOAT, GL_FALSE, 0, mSphere.positions.data());
          glEnableVertexAttribArray(mPositionLoc);
  
          // Load the normal
          glVertexAttribPointer(mNormalLoc, 3, GL_FLOAT, GL_FALSE, 0, mSphere.normals.data());
          glEnableVertexAttribArray(mNormalLoc);
  
          // Bind the texture
          glActiveTexture(GL_TEXTURE0);
          glBindTexture(GL_TEXTURE_CUBE_MAP, mTexture);
  
          // Set the texture sampler to texture unit to 0
          glUniform1i(mSamplerLoc, 0);
  
          glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(mSphere.indices.size()),
                         GL_UNSIGNED_SHORT, mSphere.indices.data());
      }
  
    private:
      // Handle to a program object
      GLuint mProgram;
  
      // Attribute locations
      GLint mPositionLoc;
      GLint mNormalLoc;
  
      // Sampler location
      GLint mSamplerLoc;
  
      // Texture handle
      GLuint mTexture;
  
      // Geometry data
      SphereGeometry mSphere;
  };
  
  int main(int argc, char **argv)
  {
      SimpleTextureCubemapSample app(argc, argv);
      return app.run();
  }