Hi
I wonder if OpenGL supports any functions to test GPU memory status which we could use before allocating memory space for buffers?
If I see weird results while drawing using VBOs - how can I know if it's caused by not enough GPU memory?
P.S. I'm using ATI HD Mobility Radeon card
TIA.
Thanks! That was fast.. I will try to use this.
You can also use glGetError to check for out of memory errors. In my current project I was allocating a lot of space for some massive offscreen render targets. And it was becoming unpredictable. Nvidia would give me an out of memory message, ATI would just die with style
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
I just gave up with it. Various graphics cards become unpredictable when u ask for too much memory. My nvidia 9800gt would often give out of memory messages, then it was like russian roulette if it worked or not. In the end I rewrote my renderer as a tile based engine ;p
Hi
Does someone know if these 2 functions are connected?
wglGetGPUInfoAMD( uGPUIDs[0],
WGL_GPU_RAM_AMD,
GL_UNSIGNED_INT,
sizeof( GLuint ),
&uTotalMemoryInMB );
GLint nCurAvailMemoryInKB = 0;
glGetIntegerv( GL_TEXTURE_FREE_MEMORY_ATI,
&nCurAvailMemoryInKB );
Do I need to call wglGetGPUInfoAMD first in order to get free memory info ,or simply glGetIntegerv(GL_TEXTURE_FREE_MEMORY_ATI,&nCur AvailMemoryInKB ) is enough?
I tried to call only the last one ,but returned value does'nt seem logical to me .
I can't call the first function since I don't know yet how to update my header files the way that wglGetGPUInfoAMD is recognized...I 'm in big delay so I don't have a time for it.
Thanks in advance
It says wglGetGPUInfoAMD returns value in MB.
glGetIntegerv returns in KB.
Header files are at http://www.opengl.org/registry/
------------------------------
Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);
Thanks, my mistake, it returns more less correct values , these functions are not connected, glGetIntegerv(..) is enough.
This ATI HD Mobility Radeon card is driving me nuts.
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