Revert 277208 "[PPAPI] Compositor API implementation."

ppapi/examples/compositor/spinning_cube.cc

Index: ppapi/examples/compositor/spinning_cube.cc
diff --git a/ppapi/examples/compositor/spinning_cube.cc b/ppapi/examples/compositor/spinning_cube.cc
deleted file mode 100644
index 2e76699c04609a3a7e47ea627840e2c2e4de0788..0000000000000000000000000000000000000000
--- a/ppapi/examples/compositor/spinning_cube.cc
+++ /dev/null
@@ -1,459 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// This example program is based on Simple_VertexShader.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 "ppapi/examples/compositor/spinning_cube.h"
-
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <algorithm>
-
-#include "ppapi/lib/gl/include/GLES2/gl2.h"
-
-namespace {
-
-const float kPi = 3.14159265359f;
-
-int GenerateCube(GLuint *vbo_vertices,
-                 GLuint *vbo_indices) {
-  const int num_indices = 36;
-
-  const GLfloat cube_vertices[] = {
-    -0.5f, -0.5f, -0.5f,
-     0.5f, -0.5f, -0.5f,
-     0.5f, -0.5f,  0.5f,
-    -0.5f, -0.5f,  0.5f,
-    -0.5f,  0.5f, -0.5f,
-     0.5f,  0.5f, -0.5f,
-     0.5f,  0.5f,  0.5f,
-    -0.5f,  0.5f,  0.5f,
-  };
-
-  const GLushort cube_indices[] = {
-    0, 2, 1,
-    0, 3, 2,
-    4, 5, 6,
-    4, 6, 7,
-    3, 6, 2,
-    3, 7, 6,
-    0, 1, 5,
-    0, 5, 4,
-    0, 7, 3,
-    0, 4, 7,
-    1, 2, 6,
-    1, 6, 5,
-  };
-
-  if (vbo_vertices) {
-    glGenBuffers(1, vbo_vertices);
-    glBindBuffer(GL_ARRAY_BUFFER, *vbo_vertices);
-    glBufferData(GL_ARRAY_BUFFER,
-                 sizeof(cube_vertices),
-                 cube_vertices,
-                 GL_STATIC_DRAW);
-    glBindBuffer(GL_ARRAY_BUFFER, 0);
-  }
-
-  if (vbo_indices) {
-    glGenBuffers(1, vbo_indices);
-    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, *vbo_indices);
-    glBufferData(GL_ELEMENT_ARRAY_BUFFER,
-                 sizeof(cube_indices),
-                 cube_indices,
-                 GL_STATIC_DRAW);
-    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
-  }
-
-  return num_indices;
-}
-
-GLuint LoadShader(GLenum type,
-                  const char* shader_source) {
-  GLuint shader = glCreateShader(type);
-  glShaderSource(shader, 1, &shader_source, NULL);
-  glCompileShader(shader);
-
-  GLint compiled = 0;
-  glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
-
-  if (!compiled) {
-    glDeleteShader(shader);
-    return 0;
-  }
-
-  return shader;
-}
-
-GLuint LoadProgram(const char* vertext_shader_source,
-                   const char* fragment_shader_source) {
-  GLuint vertex_shader = LoadShader(GL_VERTEX_SHADER,
-                                    vertext_shader_source);
-  if (!vertex_shader)
-    return 0;
-
-  GLuint fragment_shader = LoadShader(GL_FRAGMENT_SHADER,
-                                      fragment_shader_source);
-  if (!fragment_shader) {
-    glDeleteShader(vertex_shader);
-    return 0;
-  }
-
-  GLuint program_object = glCreateProgram();
-  glAttachShader(program_object, vertex_shader);
-  glAttachShader(program_object, fragment_shader);
-
-  glLinkProgram(program_object);
-
-  glDeleteShader(vertex_shader);
-  glDeleteShader(fragment_shader);
-
-  GLint linked = 0;
-  glGetProgramiv(program_object, GL_LINK_STATUS, &linked);
-
-  if (!linked) {
-    glDeleteProgram(program_object);
-    return 0;
-  }
-
-  return program_object;
-}
-
-class ESMatrix {
- public:
-  GLfloat m[4][4];
-
-  ESMatrix() {
-    LoadZero();
-  }
-
-  void LoadZero() {
-    memset(this, 0x0, sizeof(ESMatrix));
-  }
-
-  void LoadIdentity() {
-    LoadZero();
-    m[0][0] = 1.0f;
-    m[1][1] = 1.0f;
-    m[2][2] = 1.0f;
-    m[3][3] = 1.0f;
-  }
-
-  void Multiply(ESMatrix* a, ESMatrix* b) {
-    ESMatrix result;
-    for (int i = 0; i < 4; ++i) {
-      result.m[i][0] = (a->m[i][0] * b->m[0][0]) +
-                       (a->m[i][1] * b->m[1][0]) +
-                       (a->m[i][2] * b->m[2][0]) +
-                       (a->m[i][3] * b->m[3][0]);
-
-      result.m[i][1] = (a->m[i][0] * b->m[0][1]) +
-                       (a->m[i][1] * b->m[1][1]) +
-                       (a->m[i][2] * b->m[2][1]) +
-                       (a->m[i][3] * b->m[3][1]);
-
-      result.m[i][2] = (a->m[i][0] * b->m[0][2]) +
-                       (a->m[i][1] * b->m[1][2]) +
-                       (a->m[i][2] * b->m[2][2]) +
-                       (a->m[i][3] * b->m[3][2]);
-
-      result.m[i][3] = (a->m[i][0] * b->m[0][3]) +
-                       (a->m[i][1] * b->m[1][3]) +
-                       (a->m[i][2] * b->m[2][3]) +
-                       (a->m[i][3] * b->m[3][3]);
-    }
-    *this = result;
-  }
-
-  void Frustum(float left,
-               float right,
-               float bottom,
-               float top,
-               float near_z,
-               float far_z) {
-    float delta_x = right - left;
-    float delta_y = top - bottom;
-    float delta_z = far_z - near_z;
-
-    if ((near_z <= 0.0f) ||
-        (far_z <= 0.0f) ||
-        (delta_z <= 0.0f) ||
-        (delta_y <= 0.0f) ||
-        (delta_y <= 0.0f))
-      return;
-
-    ESMatrix frust;
-    frust.m[0][0] = 2.0f * near_z / delta_x;
-    frust.m[0][1] = frust.m[0][2] = frust.m[0][3] = 0.0f;
-
-    frust.m[1][1] = 2.0f * near_z / delta_y;
-    frust.m[1][0] = frust.m[1][2] = frust.m[1][3] = 0.0f;
-
-    frust.m[2][0] = (right + left) / delta_x;
-    frust.m[2][1] = (top + bottom) / delta_y;
-    frust.m[2][2] = -(near_z + far_z) / delta_z;
-    frust.m[2][3] = -1.0f;
-
-    frust.m[3][2] = -2.0f * near_z * far_z / delta_z;
-    frust.m[3][0] = frust.m[3][1] = frust.m[3][3] = 0.0f;
-
-    Multiply(&frust, this);
-  }
-
-  void Perspective(float fov_y, float aspect, float near_z, float far_z) {
-    GLfloat frustum_h = tanf(fov_y / 360.0f * kPi) * near_z;
-    GLfloat frustum_w = frustum_h * aspect;
-    Frustum(-frustum_w, frustum_w, -frustum_h, frustum_h, near_z, far_z);
-  }
-
-  void Translate(GLfloat tx, GLfloat ty, GLfloat tz) {
-    m[3][0] += m[0][0] * tx + m[1][0] * ty + m[2][0] * tz;
-    m[3][1] += m[0][1] * tx + m[1][1] * ty + m[2][1] * tz;
-    m[3][2] += m[0][2] * tx + m[1][2] * ty + m[2][2] * tz;
-    m[3][3] += m[0][3] * tx + m[1][3] * ty + m[2][3] * tz;
-  }
-
-  void Rotate(GLfloat angle, GLfloat x, GLfloat y, GLfloat z) {
-    GLfloat mag = sqrtf(x * x + y * y + z * z);
-
-    GLfloat sin_angle = sinf(angle * kPi / 180.0f);
-    GLfloat cos_angle = cosf(angle * kPi / 180.0f);
-    if (mag > 0.0f) {
-      GLfloat xx, yy, zz, xy, yz, zx, xs, ys, zs;
-      GLfloat one_minus_cos;
-      ESMatrix rotation;
-
-      x /= mag;
-      y /= mag;
-      z /= mag;
-
-      xx = x * x;
-      yy = y * y;
-      zz = z * z;
-      xy = x * y;
-      yz = y * z;
-      zx = z * x;
-      xs = x * sin_angle;
-      ys = y * sin_angle;
-      zs = z * sin_angle;
-      one_minus_cos = 1.0f - cos_angle;
-
-      rotation.m[0][0] = (one_minus_cos * xx) + cos_angle;
-      rotation.m[0][1] = (one_minus_cos * xy) - zs;
-      rotation.m[0][2] = (one_minus_cos * zx) + ys;
-      rotation.m[0][3] = 0.0F;
-
-      rotation.m[1][0] = (one_minus_cos * xy) + zs;
-      rotation.m[1][1] = (one_minus_cos * yy) + cos_angle;
-      rotation.m[1][2] = (one_minus_cos * yz) - xs;
-      rotation.m[1][3] = 0.0F;
-
-      rotation.m[2][0] = (one_minus_cos * zx) - ys;
-      rotation.m[2][1] = (one_minus_cos * yz) + xs;
-      rotation.m[2][2] = (one_minus_cos * zz) + cos_angle;
-      rotation.m[2][3] = 0.0F;
-
-      rotation.m[3][0] = 0.0F;
-      rotation.m[3][1] = 0.0F;
-      rotation.m[3][2] = 0.0F;
-      rotation.m[3][3] = 1.0F;
-
-      Multiply(&rotation, this);
-    }
-  }
-};
-
-float RotationForTimeDelta(float delta_time) {
-  return delta_time * 40.0f;
-}
-
-float RotationForDragDistance(float drag_distance) {
-  return drag_distance / 5; // Arbitrary damping.
-}
-
-}  // namespace
-
-class SpinningCube::GLState {
- public:
-  GLState();
-
-  void OnGLContextLost();
-
-  GLfloat angle_;  // Survives losing the GL context.
-
-  GLuint program_object_;
-  GLint position_location_;
-  GLint mvp_location_;
-  GLuint vbo_vertices_;
-  GLuint vbo_indices_;
-  int num_indices_;
-  ESMatrix mvp_matrix_;
-};
-
-SpinningCube::GLState::GLState()
-    : angle_(0) {
-  OnGLContextLost();
-}
-
-void SpinningCube::GLState::OnGLContextLost() {
-  program_object_ = 0;
-  position_location_ = 0;
-  mvp_location_ = 0;
-  vbo_vertices_ = 0;
-  vbo_indices_ = 0;
-  num_indices_ = 0;
-}
-
-SpinningCube::SpinningCube()
-    : initialized_(false),
-      width_(0),
-      height_(0),
-      state_(new GLState()),
-      fling_multiplier_(1.0f),
-      direction_(1) {
-  state_->angle_ = 45.0f;
-}
-
-SpinningCube::~SpinningCube() {
-  if (!initialized_)
-    return;
-  if (state_->vbo_vertices_)
-    glDeleteBuffers(1, &state_->vbo_vertices_);
-  if (state_->vbo_indices_)
-    glDeleteBuffers(1, &state_->vbo_indices_);
-  if (state_->program_object_)
-    glDeleteProgram(state_->program_object_);
-
-  delete state_;
-}
-
-void SpinningCube::Init(uint32_t width, uint32_t height) {
-  width_ = width;
-  height_ = height;
-
-  if (!initialized_) {
-    initialized_ = true;
-    const char vertext_shader_source[] =
-        "uniform mat4 u_mvpMatrix;                   \n"
-        "attribute vec4 a_position;                  \n"
-        "varying vec4 v_color;                       \n"
-        "void main()                                 \n"
-        "{                                           \n"
-        "   gl_Position = u_mvpMatrix * a_position;  \n"
-        "   v_color = vec4(a_position.x + 0.5,       \n"
-        "                  a_position.y + 0.5,       \n"
-        "                  a_position.z + 0.5,       \n"
-        "                  0.8);                     \n"
-        "}                                           \n";
-
-    const char fragment_shader_source[] =
-        "precision mediump float;                    \n"
-        "varying vec4 v_color;                       \n"
-        "void main()                                 \n"
-        "{                                           \n"
-        "  gl_FragColor = v_color;                   \n"
-        "}                                           \n";
-
-    state_->program_object_ = LoadProgram(
-        vertext_shader_source, fragment_shader_source);
-    state_->position_location_ = glGetAttribLocation(
-        state_->program_object_, "a_position");
-    state_->mvp_location_ = glGetUniformLocation(
-        state_->program_object_, "u_mvpMatrix");
-    state_->num_indices_ = GenerateCube(&state_->vbo_vertices_,
-                                        &state_->vbo_indices_);
-
-    glClearColor(0.0f, 0.0f, 0.0f, 0.2f);
-  }
-}
-
-void SpinningCube::OnGLContextLost() {
-  // TODO(yzshen): Is it correct that in this case we don't need to do cleanup
-  // for program and buffers?
-  initialized_ = false;
-  height_ = 0;
-  width_ = 0;
-  state_->OnGLContextLost();
-}
-
-void SpinningCube::SetFlingMultiplier(float drag_distance,
-                                      float drag_time) {
-  fling_multiplier_ = RotationForDragDistance(drag_distance) /
-      RotationForTimeDelta(drag_time);
-
-}
-
-void SpinningCube::UpdateForTimeDelta(float delta_time) {
-  state_->angle_ += RotationForTimeDelta(delta_time) * fling_multiplier_;
-  if (state_->angle_ >= 360.0f)
-    state_->angle_ -= 360.0f;
-
-  // Arbitrary 50-step linear reduction in spin speed.
-  if (fling_multiplier_ > 1.0f) {
-    fling_multiplier_ =
-        std::max(1.0f, fling_multiplier_ - (fling_multiplier_ - 1.0f) / 50);
-  }
-
-  Update();
-}
-
-void SpinningCube::UpdateForDragDistance(float distance) {
-  state_->angle_ += RotationForDragDistance(distance);
-  if (state_->angle_ >= 360.0f )
-    state_->angle_ -= 360.0f;
-
-  Update();
-}
-
-void SpinningCube::Draw() {
-  glViewport(0, 0, width_, height_);
-  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-  glEnable(GL_DEPTH_TEST);
-  glUseProgram(state_->program_object_);
-
-  glBindBuffer(GL_ARRAY_BUFFER, state_->vbo_vertices_);
-  glVertexAttribPointer(state_->position_location_,
-                        3,
-                        GL_FLOAT,
-                        GL_FALSE, 3 * sizeof(GLfloat),
-                        0);
-  glEnableVertexAttribArray(state_->position_location_);
-
-  glUniformMatrix4fv(state_->mvp_location_,
-                     1,
-                     GL_FALSE,
-                     (GLfloat*) &state_->mvp_matrix_.m[0][0]);
-  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, state_->vbo_indices_);
-  glDrawElements(GL_TRIANGLES,
-                 state_->num_indices_,
-                 GL_UNSIGNED_SHORT,
-                 0);
-}
-
-void SpinningCube::Update() {
-  float aspect = static_cast<GLfloat>(width_) / static_cast<GLfloat>(height_);
-
-  ESMatrix perspective;
-  perspective.LoadIdentity();
-  perspective.Perspective(60.0f, aspect, 1.0f, 20.0f );
-
-  ESMatrix modelview;
-  modelview.LoadIdentity();
-  modelview.Translate(0.0, 0.0, -2.0);
-  modelview.Rotate(state_->angle_ * direction_, 1.0, 0.0, 1.0);
-
-  state_->mvp_matrix_.Multiply(&modelview, &perspective);
-}