在Android本机代码(NDK)中使用OpenGL ES 2.0 FrameBuffer(FBO)和Stencil
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13-11-2019 - |
题
我正在尝试使用NDK(R5B)生成FRMBuffer对象并在原生Android应用程序内使用模板。目标设备正在运行Froyo 2.2,支持OpenGL ES 2.0。
所以,我一直在我的c ++本地libs中编码了大量的gl代码,并且除此之外,没有任何问题。我似乎似乎不能做到它。
这是FrameBuffer创建的代码Snipplet。完全完全是好的,但屏幕仍然完全是黑色的。这就像我创造的fbo并不真正绑定到应用程序的Java部分创建的GL表面。我的其余应用程序代码都很好,如果我删除FBO创建和绑定,一切都适用于我没有我需要的模板工作的模板。
GLint backingWidth = 1024;
GLint backingHeight = 1024;
//Create the FrameBuffer and binds it
glGenFramebuffers(1, &_defaultFramebuffer);
checkGlError("glGenFramebuffers");
glBindFramebuffer(GL_FRAMEBUFFER, _defaultFramebuffer);
checkGlError("glBindFramebuffer");
//Create the RenderBuffer for offscreen rendering // Color
glGenRenderbuffers(1, &_colorRenderbuffer);
checkGlError("glGenRenderbuffers color");
glBindRenderbuffer(GL_RENDERBUFFER, _colorRenderbuffer);
checkGlError("glBindRenderbuffer color");
glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA4, backingWidth, backingHeight);
checkGlError("glRenderbufferStorage color");
//Create the RenderBuffer for offscreen rendering // Depth
glGenRenderbuffers(1, &_depthRenderbuffer);
checkGlError("glGenRenderbuffers depth");
glBindRenderbuffer(GL_RENDERBUFFER, _depthRenderbuffer);
checkGlError("glBindRenderbuffer depth");
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, backingWidth, backingHeight);
checkGlError("glRenderbufferStorage depth");
//Create the RenderBuffer for offscreen rendering // Stencil
glGenRenderbuffers(1, &_stencilRenderbuffer);
checkGlError("glGenRenderbuffers stencil");
glBindRenderbuffer(GL_RENDERBUFFER, _stencilRenderbuffer);
checkGlError("glBindRenderbuffer stencil");
glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, backingWidth, backingHeight);
checkGlError("glRenderbufferStorage stencil");
// bind renderbuffers to framebuffer object
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, _depthRenderbuffer);
checkGlError("glFramebufferRenderbuffer depth");
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, _colorRenderbuffer);
checkGlError("glFramebufferRenderbuffer color");
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, _stencilRenderbuffer);
checkGlError("glFramebufferRenderbuffer stencil");
//Test for FrameBuffer completeness
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
checkGlError("glCheckFramebufferStatus");
switch (status)
{
case GL_FRAMEBUFFER_COMPLETE: LOGI("\n\n\nFLIPBOOM : FBO complete GL_FRAMEBUFFER_COMPLETE %x\n\n\n", status);break;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: LOGI("\n\n\nFLIPBOOM : FBO GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT %x\n\n\n", status);break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: LOGI("\n\n\nFLIPBOOM : FBO FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT %x\n\n\n", status);break;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS: LOGI("\n\n\nFLIPBOOM : FBO FRAMEBUFFER_INCOMPLETE_DIMENSIONS %x\n\n\n", status);break;
case GL_FRAMEBUFFER_UNSUPPORTED: LOGI("\n\n\nFLIPBOOM : FBO GL_FRAMEBUFFER_UNSUPPORTED %x\n\n\n", status);break;
default : LOGI("\n\n\nFLIPBOOM : failed to make complete framebuffer object %x\n\n\n", status);
}
.
我还尝试渲染到2D纹理而不是渲染效果......不起作用。
所以,有没有办法解决这个问题?我在这里得到了什么问题吗?如果有人有任何想法,请lemme知道....一直在花费太多时间来看待这个问题......嘿嘿;)
提前感谢!
欢呼!
编辑: 好的,我设法制作模板缓冲区工作,但FBO只是不起作用。我认为Android不完全支持OpenGL ES 2.0(使用R5B BTW)。我认为方法存根是定义的,但没有完全实现。或者创建的GlsurfaceView与FBO不正确链接。
为模板缓冲区,我必须做到
glEnable(GL_DEPTH_TEST);
.
并删除GldepthMask的使用情况,以便他们正常工作。
解决方案
@ zennichimaro,用于模板缓冲区使用!
在初始化期间:
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glEnable(GL_DEPTH_TEST);
.
在渲染过程中:
glViewport(0, 0, GetViewWidth(), GetViewHeight());
checkGlError("glViewport");
if (_firstRenderDone == false)
{
glClearDepthf( 0.9f );
glDepthMask( GL_TRUE );
glClear( GL_DEPTH_BUFFER_BIT );
glDepthMask( GL_FALSE );
_firstRenderDone = true;
}
glClearColor(M_channelToFloat(_backgroundColor.r),
M_channelToFloat(_backgroundColor.g),
M_channelToFloat(_backgroundColor.b),
M_channelToFloat(_backgroundColor.a));
checkGlError("glClearColor");
glClearStencil( 0 );
checkGlError("glClearStencil");
glClear( GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );
checkGlError("glClear");
_stencilLayer = 1;
//use our custom shaders
if( _program )
{
glUseProgram(_program);
if( transformMatrix3x3 != NULL )
{
glUniformMatrix3fv( _uniforms[OGL_UNIFORM_TRANSFORM], 1, false, transformMatrix3x3 );
}
// reset the shading.
glUniform1f( _uniforms[ OGL_UNIFORM_SHADE ], 0.0f );
}
//Do the actual drawing (Triangle Slip)
if( object )
{
_isRender = true;
object->OglDraw(this);
_isRender = false;
}
.
当我需要使用模板时,我使用以下方法取决于我需要的:
void GlEs2Renderer::StencilStartMask()
{
if (!USE_STENCIL) //For debugging purpose
return;
glEnable(GL_STENCIL_TEST);
//Turn off writing to the Color Buffer and Depth Buffer
//We want to draw to the Stencil Buffer only
glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
//Set 1 into the stencil buffer
glStencilFunc( GL_ALWAYS, NewStencilLayer(), 0xFFFFFFFF );
glStencilOp( GL_ZERO, GL_ZERO, GL_REPLACE );
}
void GlEs2Renderer::StencilUseMask()
{
if (!USE_STENCIL) //For debugging purpose
return;
//Turn back on Color Buffer and Depth Buffer
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
//Only write to the Stencil Buffer where 1 is set
glStencilFunc( GL_EQUAL, StencilLayer(), 0xFFFFFFFF);
//Keep the content of the Stencil Buffer
glStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
}
void GlEs2Renderer::StencilOverlayMask()
{
if (!USE_STENCIL) //For debugging purpose
return;
//Turn back on Color Buffer and Depth Buffer
glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
glDepthMask(true);
//Only write to the Stencil Buffer where 1 is set
glStencilFunc( GL_EQUAL, StencilLayer(), 0xFFFFFFFF);
//Keep the content of the Stencil Buffer and increase when z passed
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
}
.
最后我做了双手技术在模板内绘制...这里是一个例子:
glVertexAttribPointer(OGL_ATTRIB_VERTEX, 2, GL_FLOAT, 0, 0, _triangles);
glEnableVertexAttribArray(OGL_ATTRIB_VERTEX);
glVertexAttribPointer(OGL_ATTRIB_COLOR, 4, GL_UNSIGNED_BYTE, 1, 0, _colors);
glEnableVertexAttribArray(OGL_ATTRIB_COLOR);
glContext->StencilStartMask();
glDrawArrays(GL_TRIANGLE_STRIP, 0, _nPoints);
glContext->StencilUseMask();;
glDrawArrays(GL_TRIANGLE_STRIP, 0, _nPoints);
glContext->StencilEndMask();
.
我的代码很复杂,所以很难张贴与模板有关的东西,但我希望它会有所帮助;)
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