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Fast memcpy for openGL VBO

General and Gameplay Programming Programming

Started by Schinizer November 18, 2010 11:48 PM

1 comment, last by Gorax 13 years, 5 months ago

Schinizer

122

Author

November 18, 2010 11:48 PM

Hi everyone,
I'm trying to transfer data to vbo. However, with the current setup, it is slower than reinitializing the vbo with new data.

m_vertexBuffer is a std::vector<float> container, and I'm working on win32 platform.

glBindBuffer(GL_ARRAY_BUFFER, m_vertexBuffer);GLfloat* vertexPtr = (GLfloat*)glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);if(vertexPtr){	memcpy(vertexPtr, &m_renderingData[0], sizeof(float)*m_renderingData.size());	glUnmapBuffer(GL_ARRAY_BUFFER);}glBindBuffer(GL_ARRAY_BUFFER, 0);

Perhaps anyone had faced this problem and has a solution? Google had failed me this time.

Juanxo

189

November 19, 2010 01:04 AM

perhaps with glBufferSubData or glBufferData?

Gorax

202

November 20, 2010 02:21 AM

Quote:Original post by Juanxo
perhaps with glBufferSubData or glBufferData?

I'm going to have to agree with this approach. I've never been able to get the (un)map functions to work quite right (probably my fault more than anything), but the buffer functions work well. Textures get updated the exact same way, so I'm not entirely sure why they have the (un)map functions. Seems like overkill to me.

Fast memcpy for openGL VBO

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