docs/intro.html - platform/external/mesa3d - Gitiles

 <HTML>

 <TITLE>Mesa Introduction</TITLE>

 <link rel="stylesheet" type="text/css" href="mesa.css"></head>

 <BODY>

 <H1>Introduction</H1>

 <p>
 Mesa is an open-source implementation of the
 <a href="http://www.opengl.org/" target="_parent">OpenGL</a> specification -
 a system for rendering interactive 3D graphics.
 </p>

 <p>
 A variety of device drivers allows Mesa to be used in many different
 environments ranging from software emulation to complete hardware acceleration
 for modern GPUs.
 </p>

 <p>
 Mesa ties into several other open-source projects: the
 <a href="http://dri.freedesktop.org/" target="_parent">Direct Rendering
 Infrastructure</a> and <a href="http://x.org" target="_parent">X.org</a> to
 provide OpenGL support to users of X on Linux, FreeBSD and other operating
 systems.
 </p>


 <H1>Project History</H1>

 <p>
 The Mesa project was originally started by Brian Paul.
 Here's a short history of the project.
 </p>

 <p>
 August, 1993: I begin working on Mesa in my spare time.  The project
 has no name at that point.  I was simply interested in writing a simple
 3D graphics library that used the then-new OpenGL API.  I was partially
 inspired by the <em>VOGL</em> library which emulated a subset of IRIS GL.
 I had been programming with IRIS GL since 1991.
 </p>

 <p>
 November 1994: I contact SGI to ask permission to distribute my OpenGL-like
 graphics library on the internet.  SGI was generally receptive to the
 idea and after negotiations with SGI's legal department, I get permission
 to release it.
 </p>

 <p>
 February 1995: Mesa 1.0 is released on the internet.  I expected that
 a few people would be interested in it, but not thousands.
 I was soon receiving patches, new features and thank-you notes on a
 daily basis.  That encouraged me to continue working on Mesa.  The
 name Mesa just popped into my head one day.  SGI had asked me not to use
 the terms <em>"Open"</em> or <em>"GL"</em> in the project name and I didn't
 want to make up a new acronym.  Later, I heard of the Mesa programming
 language and the Mesa spreadsheet for NeXTStep.
 </p>

 <p>
 In the early days, OpenGL wasn't available on too many systems.
 It even took a while for SGI to support it across their product line.
 Mesa filled a big hole during that time.
 For a lot of people, Mesa was their first introduction to OpenGL.
 I think SGI recognized that Mesa actually helped to promote
 the OpenGL API, so they didn't feel threatened by the project.
 </p>


 <p>
 1995-1996: I continue working on Mesa both during my spare time and during
 my work hours at the Space Science and Engineering Center at the University
 of Wisconsin in Madison.  My supervisor, Bill Hibbard, lets me do this because
 Mesa is now being using for the <a href="http://www.ssec.wisc.edu/%7Ebillh/vis.html" target="_parent">Vis5D</a> project.
 </p><p>
 October 1996: Mesa 2.0 is released.  It implements the OpenGL 1.1 specification.
 </p>

 <p>
 March 1997: Mesa 2.2 is released.  It supports the new 3dfx Voodoo graphics
 card via the Glide library.  It's the first really popular hardware OpenGL
 implementation for Linux.
 </p>

 <p>
 September 1998: Mesa 3.0 is released.  It's the first publicly-available
 implementation of the OpenGL 1.2 API.
 </p>

 <p>
 March 1999: I attend my first OpenGL ARB meeting.  I contribute to the
 development of several official OpenGL extensions over the years.
 </p>

 <p>
 September 1999: I'm hired by Precision Insight, Inc.  Mesa is a key
 component of 3D hardware acceleration in the new DRI project for XFree86.
 Drivers for 3dfx, 3dLabs, Intel, Matrox and ATI hardware soon follow.
 </p>

 <p>
 October 2001: Mesa 4.0 is released.
 It implements the OpenGL 1.3 specification.
 </p>


 <p>
 November 2001: I cofounded Tungsten Graphics, Inc. with Keith Whitwell,
 Jens Owen, David Dawes and Frank LaMonica.
 Tungsten Graphics was acquired by VMware in December 2008.
 </p>

 <p>
 November 2002: Mesa 5.0 is released.
 It implements the OpenGL 1.4 specification.
 </p>

 <p>
 January 2003: Mesa 6.0 is released.  It implements the OpenGL 1.5
 specification as well as the GL_ARB_vertex_program and
 GL_ARB_fragment_program extensions.
 </p>

 <p>
 June 2007: Mesa 7.0 is released, implementing the OpenGL 2.1 specification
 and OpenGL Shading Language.
 </p>


 <p>
 Ongoing: Mesa is used as the core of many hardware OpenGL drivers for
 the XFree86 and X.org X servers within the
 <A href="http://dri.freedesktop.org/" target="_parent">DRI project</A>.
 I continue to enhance Mesa with new extensions and features.
 </p>


 <H1>Major Versions</H1>

 <p>
 This is a summary of the major versions of Mesa.
 Mesa's major version number has been incremented whenever a new version
 of the OpenGL specification is implemented.
 </p>


 <H2>Version 7.x features</H2>
 <p>
 Version 7.x of Mesa implements the OpenGL 2.1 API.  The main feature
 of OpenGL 2.x is the OpenGL Shading Language.
 </p>


 <H2>Version 6.x features</H2>
 <p>
 Version 6.x of Mesa implements the OpenGL 1.5 API with the following
 extensions incorporated as standard features:
 </p>
 <ul>
 <li>GL_ARB_occlusion_query
 <li>GL_ARB_vertex_buffer_object
 <li>GL_EXT_shadow_funcs
 </ul>
 <p>
 Also note that several OpenGL tokens were renamed in OpenGL 1.5
 for the sake of consistency.
 The old tokens are still available.
 </p>
 <pre>
 New Token                   Old Token
 ------------------------------------------------------------
 GL_FOG_COORD_SRC            GL_FOG_COORDINATE_SOURCE
 GL_FOG_COORD                GL_FOG_COORDINATE
 GL_CURRENT_FOG_COORD        GL_CURRENT_FOG_COORDINATE
 GL_FOG_COORD_ARRAY_TYPE     GL_FOG_COORDINATE_ARRAY_TYPE
 GL_FOG_COORD_ARRAY_STRIDE   GL_FOG_COORDINATE_ARRAY_STRIDE
 GL_FOG_COORD_ARRAY_POINTER  GL_FOG_COORDINATE_ARRAY_POINTER
 GL_FOG_COORD_ARRAY          GL_FOG_COORDINATE_ARRAY
 GL_SRC0_RGB                 GL_SOURCE0_RGB
 GL_SRC1_RGB                 GL_SOURCE1_RGB
 GL_SRC2_RGB                 GL_SOURCE2_RGB
 GL_SRC0_ALPHA               GL_SOURCE0_ALPHA
 GL_SRC1_ALPHA               GL_SOURCE1_ALPHA
 GL_SRC2_ALPHA               GL_SOURCE2_ALPHA
 </pre>
 <p>
 See the
 <a href="http://www.opengl.org/documentation/spec.html" target="_parent">
 OpenGL specification</a> for more details.
 </p>


 <H2>Version 5.x features</H2>
 <p>
 Version 5.x of Mesa implements the OpenGL 1.4 API with the following
 extensions incorporated as standard features:
 </p>
 <ul>
 <li>GL_ARB_depth_texture
 <li>GL_ARB_shadow
 <li>GL_ARB_texture_env_crossbar
 <li>GL_ARB_texture_mirror_repeat
 <li>GL_ARB_window_pos
 <li>GL_EXT_blend_color
 <li>GL_EXT_blend_func_separate
 <li>GL_EXT_blend_logic_op
 <li>GL_EXT_blend_minmax
 <li>GL_EXT_blend_subtract
 <li>GL_EXT_fog_coord
 <li>GL_EXT_multi_draw_arrays
 <li>GL_EXT_point_parameters
 <li>GL_EXT_secondary_color
 <li>GL_EXT_stencil_wrap
 <li>GL_EXT_texture_lod_bias (plus, a per-texture LOD bias parameter)
 <li>GL_SGIS_generate_mipmap
 </ul>


 <H2>Version 4.x features</H2>

 <p>
 Version 4.x of Mesa implements the OpenGL 1.3 API with the following
 extensions incorporated as standard features:
 </p>

 <ul>
 <li>GL_ARB_multisample
 <li>GL_ARB_multitexture
 <li>GL_ARB_texture_border_clamp
 <li>GL_ARB_texture_compression
 <li>GL_ARB_texture_cube_map
 <li>GL_ARB_texture_env_add
 <li>GL_ARB_texture_env_combine
 <li>GL_ARB_texture_env_dot3
 <li>GL_ARB_transpose_matrix
 </ul>

 <H2>Version 3.x features</H2>

 <p>
 Version 3.x of Mesa implements the OpenGL 1.2 API with the following
 features:
 </p>
 <ul>
 <li>BGR, BGRA and packed pixel formats
 <li>New texture border clamp mode
 <li>glDrawRangeElements()
 <li>standard 3-D texturing
 <li>advanced MIPMAP control
 <li>separate specular color interpolation
 </ul>


 <H2>Version 2.x features</H2>
 <p>
 Version 2.x of Mesa implements the OpenGL 1.1 API with the following
 features.
 </p>
 <ul>
 <li>Texture mapping:
 	<ul>
 	<li>glAreTexturesResident
 	<li>glBindTexture
 	<li>glCopyTexImage1D
 	<li>glCopyTexImage2D
 	<li>glCopyTexSubImage1D
 	<li>glCopyTexSubImage2D
 	<li>glDeleteTextures
 	<li>glGenTextures
 	<li>glIsTexture
 	<li>glPrioritizeTextures
 	<li>glTexSubImage1D
 	<li>glTexSubImage2D
 	</ul>
 <li>Vertex Arrays:
 	<ul>
 	<li>glArrayElement
 	<li>glColorPointer
 	<li>glDrawElements
 	<li>glEdgeFlagPointer
 	<li>glIndexPointer
 	<li>glInterleavedArrays
 	<li>glNormalPointer
 	<li>glTexCoordPointer
 	<li>glVertexPointer
 	</ul>
 <li>Client state management:
 	<ul>
 	<li>glDisableClientState
 	<li>glEnableClientState
 	<li>glPopClientAttrib
 	<li>glPushClientAttrib
 	</ul>
 <li>Misc:
 	<ul>
 	<li>glGetPointer
 	<li>glIndexub
 	<li>glIndexubv
 	<li>glPolygonOffset
 	</ul>
 </ul>


 </body>
 </html>
	<HTML>

	<TITLE>Mesa Introduction</TITLE>

	<link rel="stylesheet" type="text/css" href="mesa.css"></head>

	<BODY>

	<H1>Introduction</H1>

	<p>
	Mesa is an open-source implementation of the
	<a href="http://www.opengl.org/" target="_parent">OpenGL</a> specification -
	a system for rendering interactive 3D graphics.
	</p>

	<p>
	A variety of device drivers allows Mesa to be used in many different
	environments ranging from software emulation to complete hardware acceleration
	for modern GPUs.
	</p>

	<p>
	Mesa ties into several other open-source projects: the
	<a href="http://dri.freedesktop.org/" target="_parent">Direct Rendering
	Infrastructure</a> and <a href="http://x.org" target="_parent">X.org</a> to
	provide OpenGL support to users of X on Linux, FreeBSD and other operating
	systems.
	</p>



	<H1>Project History</H1>

	<p>
	The Mesa project was originally started by Brian Paul.
	Here's a short history of the project.
	</p>

	<p>
	August, 1993: I begin working on Mesa in my spare time. The project
	has no name at that point. I was simply interested in writing a simple
	3D graphics library that used the then-new OpenGL API. I was partially
	inspired by the <em>VOGL</em> library which emulated a subset of IRIS GL.
	I had been programming with IRIS GL since 1991.
	</p>

	<p>
	November 1994: I contact SGI to ask permission to distribute my OpenGL-like
	graphics library on the internet. SGI was generally receptive to the
	idea and after negotiations with SGI's legal department, I get permission
	to release it.
	</p>

	<p>
	February 1995: Mesa 1.0 is released on the internet. I expected that
	a few people would be interested in it, but not thousands.
	I was soon receiving patches, new features and thank-you notes on a
	daily basis. That encouraged me to continue working on Mesa. The
	name Mesa just popped into my head one day. SGI had asked me not to use
	the terms <em>"Open"</em> or <em>"GL"</em> in the project name and I didn't
	want to make up a new acronym. Later, I heard of the Mesa programming
	language and the Mesa spreadsheet for NeXTStep.
	</p>

	<p>
	In the early days, OpenGL wasn't available on too many systems.
	It even took a while for SGI to support it across their product line.
	Mesa filled a big hole during that time.
	For a lot of people, Mesa was their first introduction to OpenGL.
	I think SGI recognized that Mesa actually helped to promote
	the OpenGL API, so they didn't feel threatened by the project.
	</p>


	<p>
	1995-1996: I continue working on Mesa both during my spare time and during
	my work hours at the Space Science and Engineering Center at the University
	of Wisconsin in Madison. My supervisor, Bill Hibbard, lets me do this because
	Mesa is now being using for the <a href="http://www.ssec.wisc.edu/%7Ebillh/vis.html" target="_parent">Vis5D</a> project.
	</p><p>
	October 1996: Mesa 2.0 is released. It implements the OpenGL 1.1 specification.
	</p>

	<p>
	March 1997: Mesa 2.2 is released. It supports the new 3dfx Voodoo graphics
	card via the Glide library. It's the first really popular hardware OpenGL
	implementation for Linux.
	</p>

	<p>
	September 1998: Mesa 3.0 is released. It's the first publicly-available
	implementation of the OpenGL 1.2 API.
	</p>

	<p>
	March 1999: I attend my first OpenGL ARB meeting. I contribute to the
	development of several official OpenGL extensions over the years.
	</p>

	<p>
	September 1999: I'm hired by Precision Insight, Inc. Mesa is a key
	component of 3D hardware acceleration in the new DRI project for XFree86.
	Drivers for 3dfx, 3dLabs, Intel, Matrox and ATI hardware soon follow.
	</p>

	<p>
	October 2001: Mesa 4.0 is released.
	It implements the OpenGL 1.3 specification.
	</p>


	<p>
	November 2001: I cofounded Tungsten Graphics, Inc. with Keith Whitwell,
	Jens Owen, David Dawes and Frank LaMonica.
	Tungsten Graphics was acquired by VMware in December 2008.
	</p>

	<p>
	November 2002: Mesa 5.0 is released.
	It implements the OpenGL 1.4 specification.
	</p>

	<p>
	January 2003: Mesa 6.0 is released. It implements the OpenGL 1.5
	specification as well as the GL_ARB_vertex_program and
	GL_ARB_fragment_program extensions.
	</p>

	<p>
	June 2007: Mesa 7.0 is released, implementing the OpenGL 2.1 specification
	and OpenGL Shading Language.
	</p>


	<p>
	Ongoing: Mesa is used as the core of many hardware OpenGL drivers for
	the XFree86 and X.org X servers within the
	<A href="http://dri.freedesktop.org/" target="_parent">DRI project</A>.
	I continue to enhance Mesa with new extensions and features.
	</p>



	<H1>Major Versions</H1>

	<p>
	This is a summary of the major versions of Mesa.
	Mesa's major version number has been incremented whenever a new version
	of the OpenGL specification is implemented.
	</p>


	<H2>Version 7.x features</H2>
	<p>
	Version 7.x of Mesa implements the OpenGL 2.1 API. The main feature
	of OpenGL 2.x is the OpenGL Shading Language.
	</p>


	<H2>Version 6.x features</H2>
	<p>
	Version 6.x of Mesa implements the OpenGL 1.5 API with the following
	extensions incorporated as standard features:
	</p>
	<ul>
	<li>GL_ARB_occlusion_query
	<li>GL_ARB_vertex_buffer_object
	<li>GL_EXT_shadow_funcs
	</ul>
	<p>
	Also note that several OpenGL tokens were renamed in OpenGL 1.5
	for the sake of consistency.
	The old tokens are still available.
	</p>
	<pre>
	New Token Old Token
	------------------------------------------------------------
	GL_FOG_COORD_SRC GL_FOG_COORDINATE_SOURCE
	GL_FOG_COORD GL_FOG_COORDINATE
	GL_CURRENT_FOG_COORD GL_CURRENT_FOG_COORDINATE
	GL_FOG_COORD_ARRAY_TYPE GL_FOG_COORDINATE_ARRAY_TYPE
	GL_FOG_COORD_ARRAY_STRIDE GL_FOG_COORDINATE_ARRAY_STRIDE
	GL_FOG_COORD_ARRAY_POINTER GL_FOG_COORDINATE_ARRAY_POINTER
	GL_FOG_COORD_ARRAY GL_FOG_COORDINATE_ARRAY
	GL_SRC0_RGB GL_SOURCE0_RGB
	GL_SRC1_RGB GL_SOURCE1_RGB
	GL_SRC2_RGB GL_SOURCE2_RGB
	GL_SRC0_ALPHA GL_SOURCE0_ALPHA
	GL_SRC1_ALPHA GL_SOURCE1_ALPHA
	GL_SRC2_ALPHA GL_SOURCE2_ALPHA
	</pre>
	<p>
	See the
	<a href="http://www.opengl.org/documentation/spec.html" target="_parent">
	OpenGL specification</a> for more details.
	</p>



	<H2>Version 5.x features</H2>
	<p>
	Version 5.x of Mesa implements the OpenGL 1.4 API with the following
	extensions incorporated as standard features:
	</p>
	<ul>
	<li>GL_ARB_depth_texture
	<li>GL_ARB_shadow
	<li>GL_ARB_texture_env_crossbar
	<li>GL_ARB_texture_mirror_repeat
	<li>GL_ARB_window_pos
	<li>GL_EXT_blend_color
	<li>GL_EXT_blend_func_separate
	<li>GL_EXT_blend_logic_op
	<li>GL_EXT_blend_minmax
	<li>GL_EXT_blend_subtract
	<li>GL_EXT_fog_coord
	<li>GL_EXT_multi_draw_arrays
	<li>GL_EXT_point_parameters
	<li>GL_EXT_secondary_color
	<li>GL_EXT_stencil_wrap
	<li>GL_EXT_texture_lod_bias (plus, a per-texture LOD bias parameter)
	<li>GL_SGIS_generate_mipmap
	</ul>


	<H2>Version 4.x features</H2>

	<p>
	Version 4.x of Mesa implements the OpenGL 1.3 API with the following
	extensions incorporated as standard features:
	</p>

	<ul>
	<li>GL_ARB_multisample
	<li>GL_ARB_multitexture
	<li>GL_ARB_texture_border_clamp
	<li>GL_ARB_texture_compression
	<li>GL_ARB_texture_cube_map
	<li>GL_ARB_texture_env_add
	<li>GL_ARB_texture_env_combine
	<li>GL_ARB_texture_env_dot3
	<li>GL_ARB_transpose_matrix
	</ul>

	<H2>Version 3.x features</H2>

	<p>
	Version 3.x of Mesa implements the OpenGL 1.2 API with the following
	features:
	</p>
	<ul>
	<li>BGR, BGRA and packed pixel formats
	<li>New texture border clamp mode
	<li>glDrawRangeElements()
	<li>standard 3-D texturing
	<li>advanced MIPMAP control
	<li>separate specular color interpolation
	</ul>


	<H2>Version 2.x features</H2>
	<p>
	Version 2.x of Mesa implements the OpenGL 1.1 API with the following
	features.
	</p>
	<ul>
	<li>Texture mapping:
	<ul>
	<li>glAreTexturesResident
	<li>glBindTexture
	<li>glCopyTexImage1D
	<li>glCopyTexImage2D
	<li>glCopyTexSubImage1D
	<li>glCopyTexSubImage2D
	<li>glDeleteTextures
	<li>glGenTextures
	<li>glIsTexture
	<li>glPrioritizeTextures
	<li>glTexSubImage1D
	<li>glTexSubImage2D
	</ul>
	<li>Vertex Arrays:
	<ul>
	<li>glArrayElement
	<li>glColorPointer
	<li>glDrawElements
	<li>glEdgeFlagPointer
	<li>glIndexPointer
	<li>glInterleavedArrays
	<li>glNormalPointer
	<li>glTexCoordPointer
	<li>glVertexPointer
	</ul>
	<li>Client state management:
	<ul>
	<li>glDisableClientState
	<li>glEnableClientState
	<li>glPopClientAttrib
	<li>glPushClientAttrib
	</ul>
	<li>Misc:
	<ul>
	<li>glGetPointer
	<li>glIndexub
	<li>glIndexubv
	<li>glPolygonOffset
	</ul>
	</ul>


	</body>
	</html>