render to vertex array
Author
hi,
it is almost the same problem than in this topic :
http://www.gamedev.net/community/forums/topic.asp?topic_id=372387
the thing is that it is a bit old now (2006 the last answer)....
I just want to take from my FBO the position of particle and put in a VBO for rendering. is the PBO/VBO is always the best solution?
I heard about superbuffers?vertex texture?
Is there any example available for render to vertex array (I can't find one!!!just people speacking about)
thanks
"Render to Vertexbuffer in OpenGL (HowTo)" at:
http://www.devmaster.net/forums/showthread.php?t=7457
/Mike
http://www.devmaster.net/forums/showthread.php?t=7457
/Mike
Author
hello,
I used the tutorial
I choose to copy to a PBO and after to the VBO
but it doesn't work!!!!.........................; :evil: :twisted: :x :( :cry:
is it the good way to do it?? look at my code :
the function VBO/PBO are the same that the tutorial:
and I init the VBO in the main with :
without the VBO when I do a transferFromTexture I have the good thing in the array "data" but with the VBO it is not the same....
I should just read from my Attachmentpoint and not write on it (with the VBO)..isn't it?
I used the tutorial
I choose to copy to a PBO and after to the VBO
but it doesn't work!!!!.........................; :evil: :twisted: :x :( :cry:
is it the good way to do it?? look at my code :
void DrawGLScene(){ if (!p1->check() || !p2->check() || !p3->check() || !p4->check()){ // Calling glFinish() is only neccessary to get accurate timings, // and we need a high number of iterations to avoid timing noise. glFinish(); start = clock(); p1->resetForce(); p2->resetForce(); p3->resetForce(); p4->resetForce(); p1->computeForce(); p2->computeForce(); p3->computeForce(); p4->computeForce(); bindToText(); initFBO(); performComputation(); transferFromTexture(data,0); transferFromTexture(data2,1); transferFromTexture(force,2); setParticle(); copyFBOtoPBO(); drawVBO(); glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT0_EXT, target, 0, 0); glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,GL_COLOR_ATTACHMENT1_EXT, target, 0, 0); glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); glFinish(); end = clock(); total += (end-start); printf("total time = %lf\n",total); }}the function VBO/PBO are the same that the tutorial:
void copyFBOtoPBO(void){ glReadBuffer(attachmentpoints[flag]); glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, vbo_vertices_handle); glReadPixels(0, 0, texSize, texSize, GL_RGBA, GL_FLOAT, 0); glReadBuffer(GL_NONE); glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, 0 );}void drawVBO(void){ glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo_vertices_handle); glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer ( 4, GL_FLOAT,4*sizeof(float), (char *) 0); glDisable(GL_LIGHTING); glColor3f(1, 1, 1); glDrawArrays( GL_TRIANGLES, 0,texSize*texSize ); glEnable(GL_LIGHTING); glDisableClientState(GL_VERTEX_ARRAY);}and I init the VBO in the main with :
void initVBO(void){ glGenBuffersARB(1, &vbo_vertices_handle); glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, vbo_vertices_handle); glBufferDataARB(GL_PIXEL_PACK_BUFFER_EXT, texSize*texSize*4*sizeof(float),NULL, GL_STREAM_DRAW_ARB );}without the VBO when I do a transferFromTexture I have the good thing in the array "data" but with the VBO it is not the same....
I should just read from my Attachmentpoint and not write on it (with the VBO)..isn't it?
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