https://bugs.freedesktop.org/show_bug.cgi?id=49996
Bug #: 49996
Summary: DH61AG - HD Graphics 3000 - OpenGL sampler objects on
Ubuntu Linux 12.04 do not work
Classification: Unclassified
Product: Mesa
Version: unspecified
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: mesa-dev@lists.freedesktop.org
ReportedBy: mark.newi...@seefront.com
Configuration:
- Intel SandyBridge PC Mainboard DH61AG and integrated Intel HD Graphics 3000
- Dual OS: Windows 7 32bit and Ubuntu 12.04 32bit
When using OpenGL sampler objects for configuring textures, on Ubuntu Linux you
have to create a mipmap chain by calling “glGenerateMipmap()”. Otherwise the
texture sampling will not work (e.g. returns black).
Take the following example:
// Init
int texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(…);
int sampler;
glGenSamplers(1, &sampler);
glSamplerParameteri(sampler, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glSamplerParameteri(sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// Render loop
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture);
glBindSampler(0, sampler);
…
This works perfectly on Windows but not on Ubuntu Linux. For Ubuntu Linux I
have to add the following:
//Init
…
glTexImage2D(…);
glGenerateMipmap(GL_TEXTURE_2D);
Without the mipmap the texture sampling does not work, although mipmaps are not
used. When using the traditional texture filter configuration, this problem
does not occur and the code behaves the same on Windows and Linux:
// Render loop
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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