kc3-lang/angle/samples/multi_texture/MultiTexture.cpp

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• Author : Jamie Madill
  Date : 2019-09-25 18:29:28
  Hash : 57b37b6b
  Message : Rename util/system_utils to util/test_utils. This removes a GN naming conflict between util/system_utils and common/system_utils. This conflict was preventing us from adding unit tests to utils' version of system_utils. Since these functions are only useful to tests and samples rename them test_utils for simplicity. Will enable further development of ANGLE's standalone testing harness. Bug: angleproject:3162 Change-Id: I9e34fb69f96c5de6dc2453fce4148a0f285e15ed Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1825268 Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

• samples/multi_texture/MultiTexture.cpp

• //
  // Copyright 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 MultiTexture.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 "tga_utils.h"
  #include "util/shader_utils.h"
  #include "util/test_utils.h"
  
  class MultiTextureSample : public SampleApplication
  {
    public:
      MultiTextureSample(int argc, char **argv) : SampleApplication("MultiTexture", argc, argv) {}
  
      GLuint loadTexture(const std::string &path)
      {
          TGAImage img;
          if (!LoadTGAImageFromFile(path, &img))
          {
              return 0;
          }
  
          return LoadTextureFromTGAImage(img);
      }
  
      bool initialize() override
      {
          constexpr char kVS[] = R"(attribute vec4 a_position;
  attribute vec2 a_texCoord;
  varying vec2 v_texCoord;
  void main()
  {
      gl_Position = a_position;
      v_texCoord = a_texCoord;
  })";
  
          constexpr char kFS[] = R"(precision mediump float;
  varying vec2 v_texCoord;
  uniform sampler2D s_baseMap;
  uniform sampler2D s_lightMap;
  void main()
  {
      vec4 baseColor;
      vec4 lightColor;
  
      baseColor = texture2D(s_baseMap, v_texCoord);
      lightColor = texture2D(s_lightMap, v_texCoord);
      gl_FragColor = baseColor * (lightColor + 0.25);
  })";
  
          mProgram = CompileProgram(kVS, kFS);
          if (!mProgram)
          {
              return false;
          }
  
          // Get the attribute locations
          mPositionLoc = glGetAttribLocation(mProgram, "a_position");
          mTexCoordLoc = glGetAttribLocation(mProgram, "a_texCoord");
  
          // Get the sampler location
          mBaseMapLoc  = glGetUniformLocation(mProgram, "s_baseMap");
          mLightMapLoc = glGetUniformLocation(mProgram, "s_lightMap");
  
          // Load the textures
          std::stringstream baseStr;
          baseStr << angle::GetExecutableDirectory() << "/basemap.tga";
  
          std::stringstream lightStr;
          lightStr << angle::GetExecutableDirectory() << "/lightmap.tga";
  
          mBaseMapTexID  = loadTexture(baseStr.str());
          mLightMapTexID = loadTexture(lightStr.str());
          if (mBaseMapTexID == 0 || mLightMapTexID == 0)
          {
              return false;
          }
  
          return true;
      }
  
      void destroy() override
      {
          glDeleteProgram(mProgram);
          glDeleteTextures(1, &mBaseMapTexID);
          glDeleteTextures(1, &mLightMapTexID);
      }
  
      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);
  
          // Use the program object
          glUseProgram(mProgram);
  
          // Load the vertex position
          glVertexAttribPointer(mPositionLoc, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), vertices);
          // Load the texture coordinate
          glVertexAttribPointer(mTexCoordLoc, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat),
                                vertices + 3);
  
          glEnableVertexAttribArray(mPositionLoc);
          glEnableVertexAttribArray(mTexCoordLoc);
  
          // Bind the base map
          glActiveTexture(GL_TEXTURE0);
          glBindTexture(GL_TEXTURE_2D, mBaseMapTexID);
  
          // Set the base map sampler to texture unit to 0
          glUniform1i(mBaseMapLoc, 0);
  
          // Bind the light map
          glActiveTexture(GL_TEXTURE1);
          glBindTexture(GL_TEXTURE_2D, mLightMapTexID);
  
          // Set the light map sampler to texture unit 1
          glUniform1i(mLightMapLoc, 1);
  
          glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
      }
  
    private:
      // Handle to a program object
      GLuint mProgram;
  
      // Attribute locations
      GLint mPositionLoc;
      GLint mTexCoordLoc;
  
      // Sampler locations
      GLint mBaseMapLoc;
      GLint mLightMapLoc;
  
      // Texture handle
      GLuint mBaseMapTexID;
      GLuint mLightMapTexID;
  };
  
  int main(int argc, char **argv)
  {
      MultiTextureSample app(argc, argv);
      return app.run();
  }