106 lines
3.3 KiB
RPMSpec
106 lines
3.3 KiB
RPMSpec
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Name
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MESA_sampler_objects
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Name Strings
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GL_MESA_sampler_objects
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Contact
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Adam Jackson <ajax@redhat.com>
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Contributors
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Emma Anholt
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The contributors to ARB_sampler_objects and OpenGL ES 3
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Status
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Shipping
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Version
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Last Modified Date: 14 Sep 2021
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Author Revision: 3
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Number
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TBD
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Dependencies
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OpenGL ES 2.0 is required.
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This extension interacts with:
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- EXT_shadow_samplers
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- EXT_texture_filter_anisotropic
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- EXT_texture_sRGB_decode
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- OES_texture_border_clamp
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Overview
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This extension makes the sampler object subset of OpenGL ES 3.0 available
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in OpenGL ES 2.0 contexts. As the intent is to allow access to the API
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without necessarily requiring additional renderer functionality, some
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sampler state that would be mandatory in GLES 3 is dependent on the
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presence of additional extensions. Under GLES 3.0 or above this extension's
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name string may be exposed for compatibility, but it is otherwise without
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effect.
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Refer to the OpenGL ES 3.0 specification for API details not covered here.
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New Procedures and Functions
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void glGenSamplers (GLsizei count, GLuint *samplers);
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void glDeleteSamplers (GLsizei count, const GLuint *samplers);
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GLboolean glIsSampler (GLuint sampler);
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void glBindSampler (GLuint unit, GLuint sampler);
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void glSamplerParameteri (GLuint sampler, GLenum pname, GLint param);
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void glSamplerParameteriv (GLuint sampler, GLenum pname, const GLint *param);
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void glSamplerParameterf (GLuint sampler, GLenum pname, GLfloat param);
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void glSamplerParameterfv (GLuint sampler, GLenum pname, const GLfloat *param);
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void glGetSamplerParameteriv (GLuint sampler, GLenum pname, GLint *params);
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void glGetSamplerParameterfv (GLuint sampler, GLenum pname, GLfloat *params);
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Note that these names are exactly as in ES3, with no MESA suffix.
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New Tokens
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SAMPLER_BINDING 0x8919
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Interactions
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If EXT_shadow_samplers is not supported then TEXTURE_COMPARE_MODE and
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TEXTURE_COMPARE_FUNC will generate INVALID_ENUM.
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If EXT_texture_filter_anisotropic is not supported then
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TEXTURE_MAX_ANISOTROPY_EXT will generate INVALID_ENUM.
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If EXT_texture_sRGB_decode is not supported then TEXTURE_SRGB_DECODE_EXT
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will generate INVALID_ENUM.
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If OES_texture_border_clamp is not supported then TEXTURE_BORDER_COLOR
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will generate INVALID_ENUM.
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Issues
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1) Why bother?
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Sampler objects, at least in Mesa, are generically supported without any
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driver-dependent requirements, so enabling this is essentially free. This
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simplifies application support for otherwise GLES2 hardware, and for
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drivers in development that haven't yet achieved GLES3.
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Revision History
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Rev. Date Author Changes
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---- -------- -------- ---------------------------------------------
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1 2019/10/22 ajax Initial revision
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2 2019/11/14 ajax Add extension interactions:
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- EXT_shadow_samplers
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- EXT_texture_filter_anisotropic
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- EXT_texture_sRGB_decode
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- OES_texture_border_clamp
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3 2021/09/14 ajax Expand the justification and ES3 interaction
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