NaCl VS Add-in hello_world_gles example

visual_studio/NativeClientVSAddIn/InstallerResources/examples/hello_world_gles/hello_world_gles/hello_world.cc

+/* Copyright (c) 2012 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.
+ */
+
+/** @file hello_world_gles.cc
+ * This example demonstrates loading and running a simple 3D openGL ES 2.0
+ * application.
+ */
+
+//-----------------------------------------------------------------------------
+// The spinning Cube
+//-----------------------------------------------------------------------------
+
+#define _USE_MATH_DEFINES 1
+#include <limits.h>
+#include <math.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ppapi/c/pp_stdint.h"
+#include "ppapi/c/pp_completion_callback.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/c/pp_graphics_3d.h"
+#include "ppapi/c/pp_module.h"
+#include "ppapi/c/pp_var.h"
+#include "ppapi/c/ppb.h"
+#include "ppapi/c/ppb_core.h"
+#include "ppapi/c/ppb_graphics_3d.h"
+#include "ppapi/c/ppb_instance.h"
+#include "ppapi/c/ppb_messaging.h"
+#include "ppapi/c/ppb_opengles2.h"
+#include "ppapi/c/ppb_var.h"
+#include "ppapi/c/ppp.h"
+#include "ppapi/c/ppp_instance.h"
+#include "ppapi/c/ppp_messaging.h"
+#include "ppapi/c/ppb_url_loader.h"
+#include "ppapi/c/ppb_url_request_info.h"
+
+#include "ppapi/c/ppp_graphics_3d.h"
+#include "ppapi/lib/gl/gles2/gl2ext_ppapi.h"
+
+#include <GLES2/gl2.h>
+#include "matrix.h"
+
+static PPB_Messaging* ppb_messaging_interface = NULL;
+static PPB_Var* ppb_var_interface = NULL;
+static PPB_Core* ppb_core_interface = NULL;
+static PPB_Graphics3D* ppb_g3d_interface = NULL;
+static PPB_Instance* ppb_instance_interface = NULL;
+static PPB_URLRequestInfo* ppb_urlrequestinfo_interface = NULL;
+static PPB_URLLoader* ppb_urlloader_interface = NULL;
+
+static PP_Instance g_instance;
+static PP_Resource g_context;
+
+GLuint  g_positionLoc;
+GLuint  g_texCoordLoc;
+GLuint  g_colorLoc;
+GLuint  g_MVPLoc;
+GLuint  g_vboID;
+GLuint  g_ibID;
+GLubyte g_Indices[36];
+
+GLuint g_programObj;
+GLuint g_vertexShader;
+GLuint g_fragmentShader;
+
+GLuint g_textureLoc = 0;
+GLuint g_textureID = 0;
+
+float g_fSpinX = 0.0f;
+float g_fSpinY = 0.0f;
+
+//-----------------------------------------------------------------------------
+// Rendering Assets
+//-----------------------------------------------------------------------------
+struct Vertex
+{
+  float tu, tv;
+  float color[3];
+  float loc[3];
+};
+
+Vertex *g_quadVertices = NULL;
+const char *g_TextureData = NULL;
+const char *g_VShaderData = NULL;
+const char *g_FShaderData = NULL;
+int g_LoadCnt = 0;
+
+//-----------------------------------------------------------------------------
+// PROTOTYPES
+//-----------------------------------------------------------------------------
+void PostMessage(const char *fmt, ...);
+char* LoadFile(const char *fileName);
+
+void BuildQuad(Vertex* verts, int axis[3], float depth, float color[3]);
+Vertex* BuildCube(void);
+
+void InitGL(void);
+void InitProgram(void);
+void Render(void);
+
+
+static struct PP_Var CStrToVar(const char* str) {
+  if (ppb_var_interface != NULL) {
+    return ppb_var_interface->VarFromUtf8(str, strlen(str));
+  }
+  return PP_MakeUndefined();
+}
+
+
+void PostMessage(const char *fmt, ...) {
+  va_list args;
+  va_start(args, fmt);
+
+  char msg[4096];
+  vsnprintf(msg, sizeof(msg), fmt, args);
+
+  if (ppb_messaging_interface)
+    ppb_messaging_interface->PostMessage(g_instance, CStrToVar(msg));
+
+  va_end(args);
+}
+
+void MainLoop(void* foo, int bar) {
+  if (g_LoadCnt == 3) {
+    InitProgram();
+    g_LoadCnt++;
+  }
+  if (g_LoadCnt > 3) {
+    Render();
+    PP_CompletionCallback cc = PP_MakeCompletionCallback(MainLoop, 0);
+    ppb_g3d_interface->SwapBuffers(g_context, cc);
+  } else {
+    PP_CompletionCallback cc = PP_MakeCompletionCallback(MainLoop, 0);
+    ppb_core_interface->CallOnMainThread(0, cc, 0);
+  }
+}
+
+void InitGL(void)
+{
+  int32_t attribs[] = {
+    PP_GRAPHICS3DATTRIB_ALPHA_SIZE, 8,
+    PP_GRAPHICS3DATTRIB_DEPTH_SIZE, 24,
+    PP_GRAPHICS3DATTRIB_STENCIL_SIZE, 8,
+    PP_GRAPHICS3DATTRIB_SAMPLES, 0,
+    PP_GRAPHICS3DATTRIB_SAMPLE_BUFFERS, 0,
+    PP_GRAPHICS3DATTRIB_WIDTH, 640,
+    PP_GRAPHICS3DATTRIB_HEIGHT, 480,
+    PP_GRAPHICS3DATTRIB_NONE
+  };
+
+  g_context =  ppb_g3d_interface->Create(g_instance, 0, attribs);
+  int32_t success =  ppb_instance_interface->BindGraphics(g_instance, g_context);
+  if (success == PP_FALSE)
+  {
+    glSetCurrentContextPPAPI(0);
+    printf("Failed to set context.\n");
+    return;
+  }
+  glSetCurrentContextPPAPI(g_context);
+
+  glViewport(0,0, 640,480);
+  glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
+}
+
+
+GLuint compileShader(GLenum type, const char *data) {
+  const char *shaderStrings[1];
+  shaderStrings[0] = data;
+
+  GLuint shader = glCreateShader(type);
+  glShaderSource(shader, 1, shaderStrings, NULL );
+  glCompileShader(shader);
+  return shader;
+}
+
+
+void InitProgram( void )
+{
+  glSetCurrentContextPPAPI(g_context);
+
+  g_vertexShader = compileShader(GL_VERTEX_SHADER, g_VShaderData);
+  g_fragmentShader = compileShader(GL_FRAGMENT_SHADER, g_FShaderData);
+
+  g_programObj = glCreateProgram();
+  glAttachShader(g_programObj, g_vertexShader);
+  glAttachShader(g_programObj, g_fragmentShader);
+  glLinkProgram(g_programObj);
+
+  glGenBuffers(1, &g_vboID);
+  glBindBuffer(GL_ARRAY_BUFFER, g_vboID);
+  glBufferData(GL_ARRAY_BUFFER, 24 * sizeof(Vertex), (void*)&g_quadVertices[0],
+               GL_STATIC_DRAW);
+
+  glGenBuffers(1, &g_ibID);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ibID);
+  glBufferData(GL_ELEMENT_ARRAY_BUFFER, 36 * sizeof(char), (void*)&g_Indices[0],
+               GL_STATIC_DRAW);
+
+  //
+  // Create a texture to test out our fragment shader...
+  //
+  glGenTextures(1, &g_textureID);
+  glBindTexture(GL_TEXTURE_2D, g_textureID);
+  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 128, 128, 0, GL_RGB, GL_UNSIGNED_BYTE,
+               g_TextureData);
+
+  //
+  // Locate some parameters by name so we can set them later...
+  //
+  g_textureLoc = glGetUniformLocation(g_programObj, "arrowTexture");
+  g_positionLoc = glGetAttribLocation(g_programObj, "a_position");
+  g_texCoordLoc = glGetAttribLocation(g_programObj, "a_texCoord");
+  g_colorLoc = glGetAttribLocation(g_programObj, "a_color");
+  g_MVPLoc = glGetUniformLocation(g_programObj, "a_MVP");
+}
+
+
+void BuildQuad(Vertex* verts, int axis[3], float depth, float color[3]) {
+  static float X[4] = { -1.0f, 1.0f, 1.0f, -1.0f };
+  static float Y[4] = { -1.0f, -1.0f, 1.0f, 1.0f };
+
+  for (int i = 0; i < 4; i++) {
+    verts[i].tu = (1.0 - X[i]) / 2.0f;
+    verts[i].tv = (Y[i] + 1.0f) / -2.0f * depth;
+    verts[i].loc[axis[0]] = X[i] * depth;
+    verts[i].loc[axis[1]] = Y[i] * depth;
+    verts[i].loc[axis[2]] = depth;
+    for (int j = 0; j < 3; j++)
+      verts[i].color[j] = color[j] * (Y[i] + 1.0f) / 2.0f;
+  }
+}
+
+
+Vertex *BuildCube() {
+  Vertex *verts = new Vertex[24];
+  for (int i = 0; i < 3; i++) {
+    int Faxis[3];
+    int Baxis[3];
+    float Fcolor[3];
+    float Bcolor[3];
+    for (int j = 0; j < 3; j++) {
+      Faxis[j] = (j + i) % 3;
+      Baxis[j] = (j + i) % 3;
+    }
+    memset(Fcolor, 0, sizeof(float) * 3);
+    memset(Bcolor, 0, sizeof(float) * 3);
+    Fcolor[i] = 0.5f;
+    Bcolor[i] = 1.0f;
+    BuildQuad(&verts[0 + i * 4], Faxis, 1.0f, Fcolor);
+    BuildQuad(&verts[12 + i * 4], Baxis, -1.0f, Bcolor);
+  }
+
+  for(int i = 0; i < 6; i++) {
+    g_Indices[i*6 + 0] = 2 + i * 4;
+    g_Indices[i*6 + 1] = 1 + i * 4;
+    g_Indices[i*6 + 2] = 0 + i * 4;
+    g_Indices[i*6 + 3] = 3 + i * 4;
+    g_Indices[i*6 + 4] = 2 + i * 4;
+    g_Indices[i*6 + 5] = 0 + i * 4;
+  }
+  return verts;
+}
+
+
+void Render( void )
+{
+  static float xRot = 0.0;
+  static float yRot = 0.0;
+
+  xRot += 2.0f;
+  yRot += 0.5f;
+  if (xRot >= 360.0f) xRot = 0.0;
+  if (yRot >= 360.0f) yRot = 0.0;
+
+  glClearColor(0.5,0.5,0.5,1);
+  glClearDepthf(1.0);
+  glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+  glEnable(GL_DEPTH_TEST);
+
+  //set what program to use
+  glUseProgram( g_programObj );
+  glActiveTexture ( GL_TEXTURE0 );
+  glBindTexture ( GL_TEXTURE_2D,g_textureID );
+  glUniform1i ( g_textureLoc, 0 );
+
+  //create our perspective matrix
+  float mpv[16];
+  float trs[16];
+  float rot[16];
+
+  identity_matrix(mpv);
+  glhPerspectivef2(&mpv[0], 45.0f, 640.0f / 480.0f,1, 10);
+
+  translate_matrix(0, 0, -4.0, trs);
+  rotate_matrix(xRot, yRot , 0.0f ,rot);
+  multiply_matrix(trs, rot, trs);
+  multiply_matrix(mpv, trs, mpv);
+  glUniformMatrix4fv(g_MVPLoc, 1, GL_FALSE, (GLfloat*) mpv);
+
+  //define the attributes of the vertex
+  glBindBuffer(GL_ARRAY_BUFFER, g_vboID);
+  glVertexAttribPointer(g_positionLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex,loc));
+  glEnableVertexAttribArray(g_positionLoc);
+  glVertexAttribPointer(g_texCoordLoc, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex,tu));
+  glEnableVertexAttribArray(g_texCoordLoc);
+  glVertexAttribPointer(g_colorLoc, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex,color));
+  glEnableVertexAttribArray(g_colorLoc);
+
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ibID);
+  glDrawElements ( GL_TRIANGLES, 36, GL_UNSIGNED_BYTE ,0 );
+}
+
+
+typedef void (*OpenCB)(void *dataPtr);
+struct OpenRequest {
+  PP_Resource loader_;
+  PP_Resource request_;
+  char* buf_;
+  void* data_;
+  int64_t size_;
+  int64_t avail_;
+  OpenCB cb_;
+};
+
+
+void FreeRequest(OpenRequest* req) {
+  if (req) {
+    ppb_core_interface->ReleaseResource(req->request_);
+    ppb_core_interface->ReleaseResource(req->loader_);
+    free(req);
+  }
+}
+
+
+static void URLPartialRead(void* user_data, int mode) {
+  OpenRequest* req = (OpenRequest *) user_data;
+  int64_t total;
+  int32_t cnt;
+
+  if (mode < 0) {
+    free(req->buf_);
+    req->cb_(NULL);
+    FreeRequest(req);
+    return;
+  }
+
+  req->avail_ += mode;
+  total = req->size_ - req->avail_;
+
+  cnt = (total > LONG_MAX) ? LONG_MAX : (int32_t) total;
+  // If we still have more to do, re-issue the read.
+  if (cnt > 0) {
+    int32_t bytes = ppb_urlloader_interface->ReadResponseBody(req->loader_,
+        (void *) &req->buf_[req->avail_], cnt,
+        PP_MakeCompletionCallback(URLPartialRead, req));
+
+    // If the reissue completes immediately, then process it.
+    if (bytes != PP_OK_COMPLETIONPENDING) {
+      URLPartialRead(user_data, bytes);
+    }
+    return;
+  }
+
+  // Nothing left, so signal complete.
+  req->cb_(req);
+  FreeRequest(req);
+  printf("Loaded\n");
+}
+
+
+static void URLOpened(void* user_data, int mode) {
+  OpenRequest* req = (OpenRequest *) user_data;
+
+  int64_t cur, total;
+  int32_t cnt;
+  ppb_urlloader_interface->GetDownloadProgress(req->loader_, &cur, &total);
+
+  // If we can't preallocate the buffer because the size is unknown, then
+  // fail the load.
+  if (total == -1) {
+    req->cb_(NULL);
+    FreeRequest(req);
+    return;
+  }
+
+  // Otherwise allocate a buffer with enough space for a terminating
+  // NUL in case we need one.
+  cnt = (total > LONG_MAX) ? LONG_MAX : (int32_t) total;
+  req->buf_ = (char *) malloc(cnt + 1);
+  req->buf_[cnt] = 0;
+  req->size_ = cnt;
+  int32_t bytes = ppb_urlloader_interface->ReadResponseBody(req->loader_, req->buf_, cnt,
+      PP_MakeCompletionCallback(URLPartialRead, req));
+
+  // Usually we are pending.
+  if (bytes == PP_OK_COMPLETIONPENDING) return;
+
+  // But if we did complete the read, then dispatch the handler.
+  URLPartialRead(req, bytes);
+}
+
+void LoadURL(PP_Instance inst, const char *url, OpenCB cb, void *data) {
+  OpenRequest* req = (OpenRequest*) malloc(sizeof(OpenRequest));
+  memset(req, 0, sizeof(OpenRequest));
+
+  req->loader_ = ppb_urlloader_interface->Create(inst);
+  req->request_ = ppb_urlrequestinfo_interface->Create(inst);
+  req->cb_ = cb;
+  req->data_ = data;
+
+  if (!req->loader_ || !req->request_) {
+    cb(NULL);
+    FreeRequest(req);
+    return;
+  }
+
+  ppb_urlrequestinfo_interface->SetProperty(req->request_,
+      PP_URLREQUESTPROPERTY_URL, CStrToVar(url));
+  ppb_urlrequestinfo_interface->SetProperty(req->request_,
+      PP_URLREQUESTPROPERTY_METHOD, CStrToVar("GET"));
+  ppb_urlrequestinfo_interface->SetProperty(req->request_,
+      PP_URLREQUESTPROPERTY_RECORDDOWNLOADPROGRESS, PP_MakeBool(PP_TRUE));
+
+  int val = ppb_urlloader_interface->Open(req->loader_, req->request_,
+      PP_MakeCompletionCallback(URLOpened, req));
+
+  if (val != PP_OK_COMPLETIONPENDING) {
+    cb(NULL);
+    free(req);
+  }
+}
+
+void Loaded(void* data) {
+  OpenRequest *req = (OpenRequest *) data;
+  if (req && req->buf_) {
+    char **pptr = (char **) req->data_;
+    *pptr = req->buf_;
+    g_LoadCnt++;
+    return;
+  }
+  PostMessage("Failed to load asset.\n");
+}
+
+
+/**
+ * Called when the NaCl module is instantiated on the web page. The identifier
+ * of the new instance will be passed in as the first argument (this value is
+ * generated by the browser and is an opaque handle).  This is called for each
+ * instantiation of the NaCl module, which is each time the <embed> tag for
+ * this module is encountered.
+ *
+ * If this function reports a failure (by returning @a PP_FALSE), the NaCl
+ * module will be deleted and DidDestroy will be called.
+ * @param[in] instance The identifier of the new instance representing this
+ *     NaCl module.
+ * @param[in] argc The number of arguments contained in @a argn and @a argv.
+ * @param[in] argn An array of argument names.  These argument names are
+ *     supplied in the <embed> tag, for example:
+ *       <embed id="nacl_module" dimensions="2">
+ *     will produce two arguments, one named "id" and one named "dimensions".
+ * @param[in] argv An array of argument values.  These are the values of the
+ *     arguments listed in the <embed> tag.  In the above example, there will
+ *     be two elements in this array, "nacl_module" and "2".  The indices of
+ *     these values match the indices of the corresponding names in @a argn.
+ * @return @a PP_TRUE on success.
+ */
+static PP_Bool Instance_DidCreate(PP_Instance instance,
+                                  uint32_t argc,
+                                  const char* argn[],
+                                  const char* argv[]) {
+  g_instance = instance;
+  LoadURL(instance, "hello.raw", Loaded, &g_TextureData);
+  LoadURL(instance, "vertex_shader_es2.vert", Loaded, &g_VShaderData);
+  LoadURL(instance, "fragment_shader_es2.frag", Loaded, &g_FShaderData);
+  g_quadVertices = BuildCube();
+  return PP_TRUE;
+}
+
+
+/**
+ * Called when the NaCl module is destroyed. This will always be called,
+ * even if DidCreate returned failure. This routine should deallocate any data
+ * associated with the instance.
+ * @param[in] instance The identifier of the instance representing this NaCl
+ *     module.
+ */
+static void Instance_DidDestroy(PP_Instance instance) {
+  delete[] g_TextureData;
+  delete[] g_VShaderData;
+  delete[] g_FShaderData;
+  delete[] g_quadVertices;
+}
+
+/**
+ * Called when the position, the size, or the clip rect of the element in the
+ * browser that corresponds to this NaCl module has changed.
+ * @param[in] instance The identifier of the instance representing this NaCl
+ *     module.
+ * @param[in] position The location on the page of this NaCl module. This is
+ *     relative to the top left corner of the viewport, which changes as the
+ *     page is scrolled.
+ * @param[in] clip The visible region of the NaCl module. This is relative to
+ *     the top left of the plugin's coordinate system (not the page).  If the
+ *     plugin is invisible, @a clip will be (0, 0, 0, 0).
+ */
+static void Instance_DidChangeView(PP_Instance instance,
+                                   PP_Resource view_resource) {
+  if (g_context == 0) {
+    InitGL();
+    MainLoop(NULL, 0);
+  }
+}
+
+/**
+ * Notification that the given NaCl module has gained or lost focus.
+ * Having focus means that keyboard events will be sent to the NaCl module
+ * represented by @a instance. A NaCl module's default condition is that it
+ * will not have focus.
+ *
+ * Note: clicks on NaCl modules will give focus only if you handle the
+ * click event. You signal if you handled it by returning @a true from
+ * HandleInputEvent. Otherwise the browser will bubble the event and give
+ * focus to the element on the page that actually did end up consuming it.
+ * If you're not getting focus, check to make sure you're returning true from
+ * the mouse click in HandleInputEvent.
+ * @param[in] instance The identifier of the instance representing this NaCl
+ *     module.
+ * @param[in] has_focus Indicates whether this NaCl module gained or lost
+ *     event focus.
+ */
+static void Instance_DidChangeFocus(PP_Instance instance,
+                                    PP_Bool has_focus) {
+}
+
+/**
+ * Handler that gets called after a full-frame module is instantiated based on
+ * registered MIME types.  This function is not called on NaCl modules.  This
+ * function is essentially a place-holder for the required function pointer in
+ * the PPP_Instance structure.
+ * @param[in] instance The identifier of the instance representing this NaCl
+ *     module.
+ * @param[in] url_loader A PP_Resource an open PPB_URLLoader instance.
+ * @return PP_FALSE.
+ */
+static PP_Bool Instance_HandleDocumentLoad(PP_Instance instance,
+                                           PP_Resource url_loader) {
+  /* NaCl modules do not need to handle the document load function. */
+  return PP_FALSE;
+}
+
+
+/**
+ * Entry points for the module.
+ * Initialize needed interfaces: PPB_Core, PPB_Messaging and PPB_Var.
+ * @param[in] a_module_id module ID
+ * @param[in] get_browser pointer to PPB_GetInterface
+ * @return PP_OK on success, any other value on failure.
+ */
+PP_EXPORT int32_t PPP_InitializeModule(PP_Module a_module_id,
+                                       PPB_GetInterface get_browser) {
+  ppb_core_interface = (PPB_Core*)(get_browser(PPB_CORE_INTERFACE));
+  ppb_instance_interface = (PPB_Instance*)get_browser(PPB_INSTANCE_INTERFACE);
+  ppb_messaging_interface =
+      (PPB_Messaging*)(get_browser(PPB_MESSAGING_INTERFACE));
+  ppb_var_interface = (PPB_Var*)(get_browser(PPB_VAR_INTERFACE));
+  ppb_urlloader_interface =
+      (PPB_URLLoader*)(get_browser(PPB_URLLOADER_INTERFACE));
+  ppb_urlrequestinfo_interface =
+      (PPB_URLRequestInfo*)(get_browser(PPB_URLREQUESTINFO_INTERFACE));
+  ppb_g3d_interface = (PPB_Graphics3D*)get_browser(PPB_GRAPHICS_3D_INTERFACE);
+  if (!glInitializePPAPI(get_browser))
+    return PP_ERROR_FAILED;
+  return PP_OK;
+}
+
+
+/**
+ * Returns an interface pointer for the interface of the given name, or NULL
+ * if the interface is not supported.
+ * @param[in] interface_name name of the interface
+ * @return pointer to the interface
+ */
+PP_EXPORT const void* PPP_GetInterface(const char* interface_name) {
+  if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0) {
+    static PPP_Instance instance_interface = {
+      &Instance_DidCreate,
+      &Instance_DidDestroy,
+      &Instance_DidChangeView,
+      &Instance_DidChangeFocus,
+      &Instance_HandleDocumentLoad,
+    };
+    return &instance_interface;
+  }
+  return NULL;
+}
+
+
+/**
+ * Called before the plugin module is unloaded.
+ */
+PP_EXPORT void PPP_ShutdownModule() {
+}