mirror of
https://github.com/alibaba/GCanvas.git
synced 2025-12-08 17:36:42 +00:00
381 lines
13 KiB
C++
381 lines
13 KiB
C++
#include "GRenderContext.h"
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#include <fstream>
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#include <cmath>
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#include "GFrameBufferObject.h"
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#include "GLUtil.h"
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#include "Util.h"
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#include <EGL/egl.h>
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#include <vector>
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namespace NodeBinding
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{
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static std::vector<GRenderContext *> g_RenderContextVC;
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static EGLContext g_eglContext = EGL_NO_CONTEXT;
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static EGLDisplay g_eglDisplay = EGL_NO_DISPLAY;
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GRenderContext::GRenderContext(int width, int height)
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: mWidth(width), mHeight(height), mRatio(2.0), mEglDisplay(EGL_NO_DISPLAY)
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{
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GCanvasConfig config = {true, false};
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this->mCanvas = std::make_shared<gcanvas::GCanvas>("node-gcanvas", config, nullptr);
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mCanvasWidth = width * mRatio;
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mCanvasHeight = height * mRatio;
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}
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GRenderContext::GRenderContext(int width, int height, int ratio)
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: mWidth(width), mHeight(height), mRatio(ratio), mEglDisplay(EGL_NO_DISPLAY)
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{
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GCanvasConfig config = {true, true};
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this->mCanvas = std::make_shared<gcanvas::GCanvas>("node-gcanvas", config, nullptr);
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mCanvasWidth = width * mRatio;
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mCanvasHeight = height * mRatio;
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}
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void GRenderContext::initRenderEnviroment()
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{
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InitSharedContextIfNot();
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#ifdef CONTEXT_ES20
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EGLint ai32ContextAttribs[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE};
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#endif
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// Step 1 - Get the default display.
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if (mEglDisplay == EGL_NO_DISPLAY)
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{
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mEglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
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// Step 2 - Initialize EGL.
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eglInitialize(mEglDisplay, 0, 0);
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}
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#ifdef CONTEXT_ES20
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// Step 3 - Make OpenGL ES the current API.
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eglBindAPI(EGL_OPENGL_ES_API);
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// Step 4 - Specify the required configuration attributes.
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EGLint pi32ConfigAttribs[5];
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pi32ConfigAttribs[0] = EGL_SURFACE_TYPE;
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pi32ConfigAttribs[1] = EGL_WINDOW_BIT;
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pi32ConfigAttribs[2] = EGL_RENDERABLE_TYPE;
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pi32ConfigAttribs[3] = EGL_OPENGL_ES2_BIT;
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pi32ConfigAttribs[4] = EGL_NONE;
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#else
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EGLint pi32ConfigAttribs[3];
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pi32ConfigAttribs[0] = EGL_SURFACE_TYPE;
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pi32ConfigAttribs[1] = EGL_WINDOW_BIT;
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pi32ConfigAttribs[2] = EGL_NONE;
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#endif
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// Step 5 - Find a config that matches all requirements.
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int iConfigs;
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EGLConfig eglConfig;
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eglChooseConfig(mEglDisplay, pi32ConfigAttribs, &eglConfig, 1,
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&iConfigs);
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if (iConfigs != 1)
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{
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printf("Error: eglChooseConfig(): config not found \n");
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exit(-1);
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}
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// Step 6 - Create a surface to draw to.
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mEglSurface = eglCreatePbufferSurface(mEglDisplay, eglConfig, NULL);
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// Step 7 - Create a context.
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if (g_eglContext == EGL_NO_CONTEXT)
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{
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#ifdef CONTEXT_ES20
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mEglContext = eglCreateContext(mEglDisplay, eglConfig, NULL, ai32ContextAttribs);
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#else
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mEglContext = eglCreateContext(mEglDisplay, eglConfig, NULL, NULL);
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#endif
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// g_eglContext = mEglContext;
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}
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else
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{
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#ifdef CONTEXT_ES20
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mEglContext = eglCreateContext(mEglDisplay, eglConfig, g_eglContext, ai32ContextAttribs);
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#else
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mEglContext = eglCreateContext(mEglDisplay, eglConfig, NULL, NULL);
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#endif
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}
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// Step 8 - Bind the context to the current thread
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if (eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext) != EGL_TRUE)
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{
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EGLint error = eglGetError();
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printf("eglMakeCurrent fail the error is %x\n", error);
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exit(-1);
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}
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// end of standard gl context setup
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// Step 9 - create framebuffer object
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glGenFramebuffers(1, &mFboId);
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glBindFramebuffer(GL_FRAMEBUFFER, mFboId);
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glGenRenderbuffers(1, &mRenderBuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, mRenderBuffer);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_RGB565, mCanvasWidth, mCanvasHeight);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, mRenderBuffer);
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glGenRenderbuffers(1, &mDepthRenderbuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, mDepthRenderbuffer);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8_OES, mCanvasWidth, mCanvasHeight);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, mDepthRenderbuffer);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, mDepthRenderbuffer);
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// check FBO status
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GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
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if (status != GL_FRAMEBUFFER_COMPLETE)
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{
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EGLint error = eglGetError();
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printf("Problem with OpenGL framebuffer after specifying color render buffer: %x the glError is %x \n", status, error);
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exit(-1);
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}
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else
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{
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printf("FBO create success %p, fboId=%d, renderbufferId=%d depthbufferId=%d\n", this, mFboId, mRenderBuffer, mDepthRenderbuffer);
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}
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GLint format = 0, type = 0;
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glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &format);
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glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &type);
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this->initCanvas();
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g_RenderContextVC.push_back(this);
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}
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void GRenderContext::makeCurrent()
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{
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if (mEglContext != nullptr)
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{
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//判断当前上下文是否是该canvas的上下文,减少makecurrent的切换过程
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EGLContext currentContext = eglGetCurrentContext();
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EGLSurface currentSurface = eglGetCurrentSurface(EGL_DRAW);
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if (mEglContext == currentContext && mEglSurface == currentSurface)
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{
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return;
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}
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}
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if (mEglContext != EGL_NO_CONTEXT && mEglDisplay != EGL_NO_DISPLAY)
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{
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if (eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext) != EGL_TRUE)
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{
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printf("eglMakeCurrent fail \n");
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exit(-1);
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}
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}
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this->BindFBO();
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}
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void GRenderContext::initCanvas()
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{
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mCanvas->CreateContext();
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mCanvas->GetGCanvasContext()->SetClearColor(gcanvas::StrValueToColorRGBA("white"));
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mCanvas->GetGCanvasContext()->ClearScreen();
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mCanvas->GetGCanvasContext()->SetDevicePixelRatio(mRatio);
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mCanvas->OnSurfaceChanged(0, 0, mCanvasWidth, mCanvasHeight);
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}
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void GRenderContext::drawFrame()
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{
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mCanvas->drawFrame();
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this->drawCount++;
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}
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int GRenderContext::getImagePixelPNG(std::vector<unsigned char> &in)
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{
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unsigned char *data = new unsigned char[4 * mWidth * mHeight];
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int ret = this->readPixelAndSampleFromCurrentCtx(data);
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if (ret == 0)
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{
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encodePNGInBuffer(in, data, mWidth, mHeight);
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}
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else
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{
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delete data;
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data = nullptr;
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return -1;
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}
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delete data;
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data = nullptr;
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return 0;
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}
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int GRenderContext::getImagePixelJPG(unsigned char **in, unsigned long &size)
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{
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unsigned char *data = new unsigned char[4 * mWidth * mHeight];
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int ret = this->readPixelAndSampleFromCurrentCtx(data);
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if (ret == 0)
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{
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encodeJPEGInBuffer(in, size, data, mWidth, mHeight);
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}
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else
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{
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delete data;
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data = nullptr;
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return -1;
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}
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delete data;
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data = nullptr;
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return 0;
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}
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int GRenderContext::readPixelAndSampleFromCurrentCtx(unsigned char *data)
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{
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//canvas的width默认是width的2倍,这样可以增高分辨率
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int size = 4 * mCanvasWidth * mCanvasHeight;
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unsigned char *canvasData = new unsigned char[size];
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if (!canvasData)
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{
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printf("Error: allocate inputData memeroy faied! \n");
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return -1;
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}
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glReadPixels(0, 0, mCanvasWidth, mCanvasHeight, GL_RGBA, GL_UNSIGNED_BYTE, canvasData);
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if (!data)
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{
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printf("Error: allocate data memeroy faied! \n");
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delete canvasData;
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canvasData = nullptr;
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return -1;
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}
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//使用gcanvas进行采样，提高导出图片的清晰度
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gcanvas::PixelsSampler(mCanvasWidth, mCanvasHeight, (int *)canvasData, mWidth, mHeight, (int *)data);
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gcanvas::FlipPixel(data, mWidth, mHeight);
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delete canvasData;
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canvasData = nullptr;
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return 0;
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}
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void GRenderContext::render2file(std::string fileName, PIC_FORMAT format)
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{
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unsigned char *data = new unsigned char[4 * mWidth * mHeight];
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int ret = this->readPixelAndSampleFromCurrentCtx(data);
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if (ret == 0)
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{
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if (format == PNG_FORAMT)
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{
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encodePixelsToPNGFile(fileName + ".png", data, mWidth, mHeight);
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}
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else if (format == JPEG_FORMAT)
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{
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encodePixelsToJPEGFile(fileName + ".jpg", data, mWidth, mHeight);
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}
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}
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else
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//todo
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{
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}
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delete data;
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data = nullptr;
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}
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void GRenderContext::destoryRenderEnviroment()
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{
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if (this->mFboId != 0)
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{
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glDeleteFramebuffers(1, &this->mFboId);
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}
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if (this->mRenderBuffer != 0)
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{
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glDeleteRenderbuffers(1, &this->mRenderBuffer);
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}
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if (this->mDepthRenderbuffer != 0)
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{
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glDeleteRenderbuffers(1, &this->mDepthRenderbuffer);
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}
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if (this->textures.size() > 0)
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{
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glDeleteTextures(this->textures.size(), (GLuint *)&textures[0]);
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}
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if (mEglSurface != EGL_NO_SURFACE)
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{
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eglDestroySurface(mEglDisplay, mEglSurface);
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mEglSurface = EGL_NO_SURFACE;
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}
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std::vector<GRenderContext *>::iterator iter = find(g_RenderContextVC.begin(), g_RenderContextVC.end(), this);
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if (iter != g_RenderContextVC.end())
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{
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g_RenderContextVC.erase(iter);
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}
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if (mEglDisplay != EGL_NO_DISPLAY)
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{
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eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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if (mEglContext != EGL_NO_CONTEXT)
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{
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eglDestroyContext(mEglDisplay, mEglContext);
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}
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}
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mEglDisplay = EGL_NO_DISPLAY;
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mEglContext = EGL_NO_CONTEXT;
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//todo 考虑何时释放sharedContext?不用释放？等待进程销毁
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// if (g_RenderContextVC.size() == 0)
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// {
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// g_eglContext = EGL_NO_CONTEXT;
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// }
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}
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void GRenderContext::recordTextures(int textureId)
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{
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this->textures.push_back(textureId);
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}
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void GRenderContext::BindFBO()
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{
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GLint curFBOId = 0;
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &curFBOId);
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if (curFBOId != mFboId)
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{
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glBindFramebuffer(GL_FRAMEBUFFER, mFboId);
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// printf("bindfbo value is %d\n", mFboId);
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}
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}
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void GRenderContext::InitSharedContextIfNot()
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{
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if (g_eglDisplay == EGL_NO_DISPLAY && g_eglContext == EGL_NO_CONTEXT)
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{
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#ifdef CONTEXT_ES20
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EGLint ai32ContextAttribs[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE};
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#endif
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g_eglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
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// Step 2 - Initialize EGL.
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eglInitialize(g_eglDisplay, 0, 0);
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// Step 3 - Make OpenGL ES the current API.
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eglBindAPI(EGL_OPENGL_ES_API);
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// Step 4 - Specify the required configuration attributes.
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EGLint pi32ConfigAttribs[5];
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pi32ConfigAttribs[0] = EGL_SURFACE_TYPE;
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pi32ConfigAttribs[1] = EGL_WINDOW_BIT;
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pi32ConfigAttribs[2] = EGL_RENDERABLE_TYPE;
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pi32ConfigAttribs[3] = EGL_OPENGL_ES2_BIT;
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pi32ConfigAttribs[4] = EGL_NONE;
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// Step 5 - Find a config that matches all requirements.
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int iConfigs;
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EGLConfig eglConfig;
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eglChooseConfig(g_eglDisplay, pi32ConfigAttribs, &eglConfig, 1,
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&iConfigs);
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if (iConfigs != 1)
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{
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printf("Error: eglChooseConfig(): config not found \n");
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exit(-1);
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}
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// Step 7 - Create a context.
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if (g_eglContext == EGL_NO_CONTEXT)
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{
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#ifdef CONTEXT_ES20
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g_eglContext = eglCreateContext(g_eglDisplay, eglConfig, NULL, ai32ContextAttribs);
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#else
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g_eglContext = eglCreateContext(mEglDisplay, eglConfig, NULL, NULL);
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#endif
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}
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}
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}
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GRenderContext::~GRenderContext()
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{
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this->destoryRenderEnviroment();
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}
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} // namespace NodeBinding
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