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Properly check which OpenGL features are supported

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QOpenGLShaderProgram::hasOpenGLShaderPrograms tests whether
QOpenGLFunctions::Shaders is provided for the given context. As the
initialization code assumed OpenGL 2 this always was true. But
unfortunately we still cannot assume that OpenGL 2 is universally
supported. E.g. indirect rendering (no matter how bad that idea is)
does not support OpenGL 2 on all hardware and the Shader related
extensions are not available.

This change makes sure that only when OpenGL 2 is available the
features provided by OpenGL 2 are enabled. If OpenGL 2 is not
available the extensions are tested. The checks are slightly
reordered to not do the extension tests at all if OpenGL 2 is
available.

Task-number: QTBUG-39730
Change-Id: Ic775163e0dcc519925b1287f3c4ca5e8ebf101d5
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
This commit is contained in:
Martin Gräßlin 2014-06-18 13:03:15 +02:00
parent 075c36e39b
commit 473ed1c1aa
1 changed files with 40 additions and 38 deletions
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78
src/gui/opengl/qopenglfunctions.cpp
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@ -283,46 +283,48 @@ static int qt_gl_resolve_features()
QSurfaceFormat format = QOpenGLContext::currentContext()->format();
QOpenGLExtensionMatcher extensions;
// Recognize features by extension name.
if (extensions.match("GL_ARB_multitexture"))
features |= QOpenGLFunctions::Multitexture;
if (extensions.match("GL_ARB_shader_objects"))
features |= QOpenGLFunctions::Shaders;
if (extensions.match("GL_EXT_framebuffer_object") ||
extensions.match("GL_ARB_framebuffer_object"))
features |= QOpenGLFunctions::Framebuffers;
if (extensions.match("GL_EXT_blend_color"))
features |= QOpenGLFunctions::BlendColor;
if (extensions.match("GL_EXT_blend_equation_separate"))
features |= QOpenGLFunctions::BlendEquationSeparate;
if (extensions.match("GL_EXT_blend_func_separate"))
features |= QOpenGLFunctions::BlendFuncSeparate;
if (extensions.match("GL_EXT_blend_subtract"))
features |= QOpenGLFunctions::BlendSubtract;
if (extensions.match("GL_ARB_texture_compression"))
features |= QOpenGLFunctions::CompressedTextures;
if (extensions.match("GL_ARB_multisample"))
features |= QOpenGLFunctions::Multisample;
if (extensions.match("GL_ARB_texture_non_power_of_two"))
features |= QOpenGLFunctions::NPOTTextures |
QOpenGLFunctions::NPOTTextureRepeat;
// assume version 2.0 or higher
features |= QOpenGLFunctions::BlendColor |
QOpenGLFunctions::BlendEquation |
QOpenGLFunctions::Multitexture |
QOpenGLFunctions::CompressedTextures |
QOpenGLFunctions::Multisample |
QOpenGLFunctions::BlendFuncSeparate |
QOpenGLFunctions::Buffers |
QOpenGLFunctions::Shaders |
QOpenGLFunctions::StencilSeparate |
QOpenGLFunctions::BlendEquationSeparate |
QOpenGLFunctions::NPOTTextures |
QOpenGLFunctions::NPOTTextureRepeat;
if (format.majorVersion() >= 3)
features |= QOpenGLFunctions::Framebuffers;
else if (extensions.match("GL_EXT_framebuffer_object") ||
extensions.match("GL_ARB_framebuffer_object"))
features |= QOpenGLFunctions::Framebuffers;
if (format.majorVersion() >= 2) {
features |= QOpenGLFunctions::BlendColor |
QOpenGLFunctions::BlendEquation |
QOpenGLFunctions::BlendSubtract |
QOpenGLFunctions::Multitexture |
QOpenGLFunctions::CompressedTextures |
QOpenGLFunctions::Multisample |
QOpenGLFunctions::BlendFuncSeparate |
QOpenGLFunctions::Buffers |
QOpenGLFunctions::Shaders |
QOpenGLFunctions::StencilSeparate |
QOpenGLFunctions::BlendEquationSeparate |
QOpenGLFunctions::NPOTTextures |
QOpenGLFunctions::NPOTTextureRepeat;
} else {
// Recognize features by extension name.
if (extensions.match("GL_ARB_multitexture"))
features |= QOpenGLFunctions::Multitexture;
if (extensions.match("GL_ARB_shader_objects"))
features |= QOpenGLFunctions::Shaders;
if (extensions.match("GL_EXT_blend_color"))
features |= QOpenGLFunctions::BlendColor;
if (extensions.match("GL_EXT_blend_equation_separate"))
features |= QOpenGLFunctions::BlendEquationSeparate;
if (extensions.match("GL_EXT_blend_subtract"))
features |= QOpenGLFunctions::BlendSubtract;
if (extensions.match("GL_EXT_blend_func_separate"))
features |= QOpenGLFunctions::BlendFuncSeparate;
if (extensions.match("GL_ARB_texture_compression"))
features |= QOpenGLFunctions::CompressedTextures;
if (extensions.match("GL_ARB_multisample"))
features |= QOpenGLFunctions::Multisample;
if (extensions.match("GL_ARB_texture_non_power_of_two"))
features |= QOpenGLFunctions::NPOTTextures |
QOpenGLFunctions::NPOTTextureRepeat;
}
const QPair<int, int> version = format.version();
if (version < qMakePair(3, 0)