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使用PPAPI的Graphics 3D接口做了一个小示例，鼠标点击插件区域，绘制颜色，效果与ppapi_simple类似。
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项目与VS2013编译最简单的PPAPI插件这篇文章里说的ppapi_simple类似。
附加包含路径有些不同，如下：
附加库路径如下：
链接ppapi_gles2.lib，在E:\sources\CEF\2526\chromium\src\out\Release\obj\ppapi目录下。
需要新建一个c文件：ppapi_hello_gles.c。
代码生成里链接的运行库选择MD。
ppapi_hello_gles.c内容如下：
/* Copyright (c) 2016 foruok. All rights reserved.
* 欢迎关注我的微信订阅号“程序视界”
*/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <Windows.h>
#include <tchar.h>
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_module.h"
#include "ppapi/c/pp_rect.h"
#include "ppapi/c/pp_var.h"
#include "ppapi/c/ppb.h"
#include "ppapi/c/ppb_core.h"
#include "ppapi/c/ppb_instance.h"
#include "ppapi/c/ppb_view.h"
#include "ppapi/c/ppp.h"
#include "ppapi/c/ppp_instance.h"
#include "ppapi/c/ppb_input_event.h"
#include "ppapi/c/ppp_input_event.h"
#include "ppapi/c/ppb_graphics_3d.h"
#include "ppapi/c/ppb_opengles2.h"
#include "ppapi/lib/gl/include/GLES2/gl2.h"
#include "ppapi/lib/gl/gles2/gl2ext_ppapi.h"
PPB_GetInterface g_get_browser_interface = NULL;
const PPB_Core* g_core_interface;
const PPB_Graphics3D* g_graphics_3d_interface;
const PPB_Instance* g_instance_interface;
const PPB_View* g_view_interface;
const PPB_InputEvent *g_input_interface;
const PPB_MouseInputEvent *g_mouse_interface;
/* PPP_Instance implementation -----------------------------------------------*/
typedef struct InstanceInfo {
PP_Instance pp_instance;
struct PP_Size last_size;
PP_Resource graphics;
struct InstanceInfo* next;
} InstanceInfo;
/** Linked list of all live instances. */
struct InstanceInfo* all_instances = NULL;
/** Returns a refed resource corresponding to the created graphics 3d. */
PP_Resource MakeAndBindGraphics3D(PP_Instance instance,
const struct PP_Size* size) {
PP_Resource graphics;
int32_t attribs[] = { PP_GRAPHICS3DATTRIB_WIDTH, 800,
PP_GRAPHICS3DATTRIB_HEIGHT, 800,
PP_GRAPHICS3DATTRIB_NONE };
graphics = g_graphics_3d_interface->Create(instance, 0, attribs);
if (!graphics)
return 0;
if (!g_instance_interface->BindGraphics(instance, graphics)) {
g_core_interface->ReleaseResource(graphics);
return 0;
}
glSetCurrentContextPPAPI(graphics);
return graphics;
}
void ReinitializeGraphics3D(void *user_data, int32_t result)
{
InstanceInfo *inst = (InstanceInfo*)user_data;
inst->graphics = MakeAndBindGraphics3D(inst->pp_instance, &inst->last_size);
if (inst->graphics != 0)
{
glSetCurrentContextPPAPI(inst->graphics);
OutputDebugString(_T("reinitialize graphics 3d context sucess\r\n"));
}
}
void FlushCompletionCallback(void* user_data, int32_t result) {
/* Don‘t need to do anything here. */
if (result == PP_ERROR_CONTEXT_LOST)
{
OutputDebugString(_T("PP_ERROR_CONTEXT_LOST"));
//reinitialize context
g_core_interface->CallOnMainThread(0, PP_MakeCompletionCallback(ReinitializeGraphics3D, user_data), 0);
}
}
unsigned int g_colors[4] = { 0xFF0000FF, 0xFFFF00FF, 0xFF00FFFF, 0xFF2AFE00 };
unsigned int g_color_index = 0;
#define GETA(clr) ((clr >> 24) & 0xFF)
#define GETR(clr) ((clr >> 16) & 0xFF)
#define GETG(clr) ((clr >> 8) & 0xFF)
#define GETB(clr) (clr & 0xFF)
void Repaint(struct InstanceInfo* instance, const struct PP_Size* size) {
/* Ensure the graphics 3d is ready. */
if (!instance->graphics) {
instance->graphics = MakeAndBindGraphics3D(instance->pp_instance, size);
if (!instance->graphics)
return;
}
g_color_index++;
if (g_color_index >= sizeof(g_colors) / sizeof(g_colors[0])) g_color_index = 0;
struct PP_CompletionCallback callback = {
FlushCompletionCallback, instance, PP_COMPLETIONCALLBACK_FLAG_NONE,
};
glViewport(0, 0, instance->last_size.width, instance->last_size.height);
glClearColor(GETR(g_colors[g_color_index]),
GETG(g_colors[g_color_index]),
GETB(g_colors[g_color_index]),
GETA(g_colors[g_color_index]));
glClear(GL_COLOR_BUFFER_BIT);
g_graphics_3d_interface->SwapBuffers(instance->graphics, callback);
}
/** Returns the info for the given instance, or NULL if it‘s not found. */
struct InstanceInfo* FindInstance(PP_Instance instance) {
struct InstanceInfo* cur = all_instances;
while (cur) {
if (cur->pp_instance == instance)
return cur;
cur = cur->next;
}
return NULL;
}
PP_Bool Instance_DidCreate(PP_Instance instance,
uint32_t argc,
const char* argn[],
const char* argv[]) {
struct InstanceInfo* info =
(struct InstanceInfo*)calloc(1, sizeof(struct InstanceInfo));
info->pp_instance = instance;
/* Insert into linked list of live instances. */
info->next = all_instances;
all_instances = info;
g_input_interface->RequestInputEvents(instance, PP_INPUTEVENT_CLASS_MOUSE);
g_input_interface->RequestFilteringInputEvents(instance, PP_INPUTEVENT_CLASS_MOUSE);
OutputDebugString(_T("Instance_DidCreate\r\n"));
return PP_TRUE;
}
void Instance_DidDestroy(PP_Instance instance) {
/* Find the matching item in the linked list, delete it, and patch the
* links.
*/
struct InstanceInfo** prev_ptr = &all_instances;
struct InstanceInfo* cur = all_instances;
while (cur) {
if (instance == cur->pp_instance) {
*prev_ptr = cur->next;
g_core_interface->ReleaseResource(cur->graphics);
free(cur);
return;
}
prev_ptr = &cur->next;
cur = cur->next;
}
}
void Instance_DidChangeView(PP_Instance pp_instance,
PP_Resource view) {
struct PP_Rect position;
struct InstanceInfo* info = FindInstance(pp_instance);
if (!info)
return;
if (g_view_interface->GetRect(view, &position) == PP_FALSE)
return;
if (info->last_size.width != position.size.width ||
info->last_size.height != position.size.height) {
info->last_size.width = position.size.width;
info->last_size.height = position.size.height;
/* Got a resize, repaint the plugin. */
Repaint(info, &position.size);
}
OutputDebugString(_T("Instance_DidChangeView\r\n"));
}
void Instance_DidChangeFocus(PP_Instance pp_instance, PP_Bool has_focus) {
}
PP_Bool Instance_HandleDocumentLoad(PP_Instance pp_instance,
PP_Resource pp_url_loader) {
return PP_FALSE;
}
static PPP_Instance instance_interface = {
&Instance_DidCreate,
&Instance_DidDestroy,
&Instance_DidChangeView,
&Instance_DidChangeFocus,
&Instance_HandleDocumentLoad
};
PP_Bool InputEvent_HandleInputEvent(PP_Instance instance, PP_Resource input_event)
{
struct PP_Point pt;
TCHAR szLog[512] = { 0 };
switch (g_input_interface->GetType(input_event))
{
case PP_INPUTEVENT_TYPE_MOUSEDOWN:
pt = g_mouse_interface->GetPosition(input_event);
_stprintf_s(szLog, 512, _T("InputEvent_HandleInputEvent, mouse down at [%d, %d]\r\n"), pt.x, pt.y);
OutputDebugString(szLog);
break;
default:
return PP_FALSE;
}
struct InstanceInfo* info = FindInstance(instance);
if (info && info->last_size.width > 0)
{
Repaint(info, &info->last_size);
}
return PP_TRUE;
}
static PPP_InputEvent input_interface = {
&InputEvent_HandleInputEvent
};
/* Global entrypoints --------------------------------------------------------*/
PP_EXPORT int32_t PPP_InitializeModule(PP_Module module,
PPB_GetInterface get_browser_interface) {
g_get_browser_interface = get_browser_interface;
g_core_interface = (const PPB_Core*)
get_browser_interface(PPB_CORE_INTERFACE);
g_instance_interface = (const PPB_Instance*)
get_browser_interface(PPB_INSTANCE_INTERFACE);
g_graphics_3d_interface = (const PPB_Graphics3D*)
get_browser_interface(PPB_GRAPHICS_3D_INTERFACE);
g_view_interface = (const PPB_View*)
get_browser_interface(PPB_VIEW_INTERFACE);
g_input_interface = (const PPB_InputEvent*)get_browser_interface(PPB_INPUT_EVENT_INTERFACE);
g_mouse_interface = (const PPB_MouseInputEvent*)get_browser_interface(PPB_MOUSE_INPUT_EVENT_INTERFACE);
if (!g_core_interface || !g_instance_interface ||
!g_graphics_3d_interface || !g_view_interface ||
!g_input_interface || !g_mouse_interface)
return -1;
if (GL_TRUE != glInitializePPAPI(get_browser_interface))
return -1;
OutputDebugString(_T("PPP_InitializeModule\r\n"));
return PP_OK;
}
PP_EXPORT void PPP_ShutdownModule() {
}
PP_EXPORT const void* PPP_GetInterface(const char* interface_name) {
if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0)
{
OutputDebugString(_T("PPP_GetInterface, instance_interface\r\n"));
return &instance_interface;
}
else if (strcmp(interface_name, PPP_INPUT_EVENT_INTERFACE) == 0)
{
OutputDebugString(_T("PPP_GetInterface, input_interface\r\n"));
return &input_interface;
}
return NULL;
}
代码的基本结构和ppapi_simple类似。不同的是使用了Graphics 3D接口。下面是代码中使用Graphics 3D接口的步骤：
这个示例仅仅通过glClear来清除颜色缓冲区来达到变换颜色的效果。后面会进一步使用gles的API绘制点儿东西。
其他参考文章：
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原文地址：http://blog.csdn.net/foruok/article/details/50563676
