kc3-lang/angle/samples/torus_lighting/TorusLightingES2.cpp

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• Hash : 5a65a2b1
  Author :
  Date : 2022-07-06T11:46:17
  

  Fix samples' arguments to SampleApplication
  
  Two new parameters were added in
  https://chromium-review.googlesource.com/c/angle/angle/+/3664916 with
  default values, but not all samples were updated to accomodate them.  As
  a result, many samples passed in the major version for client type and
  thus couldn't run.
  
  This change introduces an enum class for the client type + version to
  make sure such a mistake is impossible.
  
  Bug: angleproject:7360
  Change-Id: I450edee612d08a7b67530b61615f63268fefb200
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3748413
  Auto-Submit: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Lingfeng Yang <lfy@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• samples/torus_lighting/TorusLightingES2.cpp

• //
  // Copyright 2021 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 CubeMapActivity.java from The Android Open Source Project ApiDemos
  // https://android.googlesource.com/platform/development/+/refs/heads/master/samples/ApiDemos/src/com/example/android/apis/graphics/CubeMapActivity.java
  
  #include "SampleApplication.h"
  
  #include "torus.h"
  #include "util/Matrix.h"
  #include "util/shader_utils.h"
  
  const float kDegreesPerSecond = 90.0f;
  
  class GLES2TorusLightingSample : public SampleApplication
  {
    public:
      GLES2TorusLightingSample(int argc, char **argv)
          : SampleApplication("GLES2 Torus Lighting", argc, argv)
      {}
  
      bool initialize() override
      {
          constexpr char kVS[] = R"(uniform mat4 mv;
  uniform mat4 mvp;
  
  attribute vec4 position;
  attribute vec3 normal;
  
  varying vec3 normal_view;
  
  void main()
  {
      normal_view = vec3(mv * vec4(normal, 0.0));
      gl_Position = mvp * position;
  })";
  
          constexpr char kFS[] = R"(precision mediump float;
  
  varying vec3 normal_view;
  
  void main() {
      gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0) * dot(vec3(0.0, 0, 1.0), normalize(normal_view));
  })";
  
          mProgram = CompileProgram(kVS, kFS);
          if (!mProgram)
          {
              return false;
          }
  
          mPositionLoc = glGetAttribLocation(mProgram, "position");
          mNormalLoc   = glGetAttribLocation(mProgram, "normal");
  
          mMVPMatrixLoc = glGetUniformLocation(mProgram, "mvp");
          mMVMatrixLoc  = glGetUniformLocation(mProgram, "mv");
  
          glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
          glEnable(GL_DEPTH_TEST);
  
          GenerateTorus(&mVertexBuffer, &mIndexBuffer, &mIndexCount);
  
          glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());
          glUseProgram(mProgram);
          glEnableVertexAttribArray(mPositionLoc);
          glBindBuffer(GL_ARRAY_BUFFER, mVertexBuffer);
          glVertexAttribPointer(mPositionLoc, 3, GL_FLOAT, false, 6 * sizeof(GLfloat), nullptr);
  
          glVertexAttribPointer(mNormalLoc, 3, GL_FLOAT, false, 6 * sizeof(GLfloat),
                                reinterpret_cast<const void *>(3 * sizeof(GLfloat)));
          glEnableVertexAttribArray(mNormalLoc);
  
          glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mIndexBuffer);
  
          float ratio = static_cast<float>(getWindow()->getWidth()) /
                        static_cast<float>(getWindow()->getHeight());
          mPerspectiveMatrix = Matrix4::frustum(-ratio, ratio, -1, 1, 1.0f, 20.0f);
          mTranslationMatrix = Matrix4::translate(angle::Vector3(0, 0, -5));
  
          return true;
      }
  
      void destroy() override
      {
          glDisableVertexAttribArray(mPositionLoc);
          glDisableVertexAttribArray(mNormalLoc);
          glBindBuffer(GL_ARRAY_BUFFER, 0);
          glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
          glDeleteProgram(mProgram);
          glDeleteBuffers(1, &mVertexBuffer);
          glDeleteBuffers(1, &mIndexBuffer);
      }
  
      void step(float dt, double totalTime) override { mAngle += kDegreesPerSecond * dt; }
  
      void draw() override
      {
          glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  
          Matrix4 modelMatrix = mTranslationMatrix * Matrix4::rotate(mAngle, mYUnitVec) *
                                Matrix4::rotate(mAngle * 0.25f, mXUnitVec);
  
          Matrix4 mvpMatrix = mPerspectiveMatrix * modelMatrix;
  
          glUniformMatrix4fv(mMVMatrixLoc, 1, GL_FALSE, modelMatrix.data);
          glUniformMatrix4fv(mMVPMatrixLoc, 1, GL_FALSE, mvpMatrix.data);
  
          glDrawElements(GL_TRIANGLES, mIndexCount, GL_UNSIGNED_SHORT, 0);
      }
  
    private:
      GLuint mProgram = 0;
  
      GLint mPositionLoc = 0;
      GLint mNormalLoc   = 0;
  
      GLuint mMVPMatrixLoc = 0;
      GLuint mMVMatrixLoc  = 0;
  
      GLuint mVertexBuffer = 0;
      GLuint mIndexBuffer  = 0;
      GLsizei mIndexCount  = 0;
  
      float mAngle = 0;
  
      Matrix4 mPerspectiveMatrix;
      Matrix4 mTranslationMatrix;
  
      const angle::Vector3 mYUnitVec{0.0f, 1.0f, 0.0f};
      const angle::Vector3 mXUnitVec{1.0f, 0.0f, 0.0f};
  };
  
  int main(int argc, char **argv)
  {
      GLES2TorusLightingSample app(argc, argv);
      return app.run();
  }
  

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