| /** \mainpage |
| |
| \section about About |
| |
| Gallium3D is <a href="http://www.tungstengraphics.com/">Tungsten Graphics</a>' |
| new architecture for building 3D graphics drivers. Initially |
| supporting Mesa and Linux graphics drivers, Gallium3D is designed to allow |
| portability to all major operating systems and graphics interfaces. |
| |
| Compared to existing Linux graphics drivers, Gallium3D will: |
| |
| - Make drivers smaller and simpler. |
| Current DRI drivers are rather complicated. They're large, contain |
| duplicated code and are burdened with implementing many concepts tightly |
| tied to the OpenGL 1.x/2.x API. |
| |
| - Model modern graphics hardware. |
| The new driver architecture is an abstraction of modern graphics hardware, |
| rather than an OpenGL->hardware translator. The new driver interface will |
| assume the presence of programmable vertex/fragment shaders and flexible |
| memory objects. |
| |
| - Support multiple graphics APIs. |
| The OpenGL 3.0 API will be very different from OpenGL 1.x/2.x. We'd like a |
| driver model that is API-neutral so that it's not tied to a specific |
| graphics API. |
| |
| \section contents Contents |
| |
| - \ref overview |
| |
| - \ref statetracker |
| |
| - Pipe drivers: |
| - \ref softpipe |
| - \ref i915g |
| - Cell driver (cell_context.h, cell_winsys.h) |
| - \ref failover |
| |
| - Winsys drivers: |
| - X11 winsys driver (xm_winsys.c) |
| - Intel DRI winsys driver (intel_context.h, intel_winsys_pipe.c) |
| |
| - Ancillary Modules: |
| - \ref draw |
| - \ref tgsi |
| - LLVM TGSI backend (gallivm.h) |
| |
| - \ref callgraph |
| |
| \section external External documentation |
| |
| - <a href="http://www.tungstengraphics.com/gallium3D.htm">Gallium3D's Architectural Overview</a> |
| - <a href="http://www.tungstengraphics.com/wiki/index.php/Gallium3D">Technical Overview</a> |
| - <a href="http://www.tungstengraphics.com/wiki/files/gallium3d-xds2007.pdf">Gallium3D talk from XDS 2007</a> |
| |
| */ |
| |
| /** \page overview Overview |
| |
| The public interface of a Gallium3D driver is described by the p_context.h |
| header file. The pipe_context structure is an abstract base class with |
| methods for: |
| |
| - Setting rendering state (texture sampler state, vertex array info, drawing surfaces, etc.) |
| |
| - Setting shader state, using the TGSI binary shader representation. |
| |
| - Vertex array and indexed vertex array drawing. |
| |
| - Region (memory) management for textures, renderbuffers, vertex buffers, etc. |
| |
| - Hardware queries (number of texture units, max texture size, etc). |
| |
| The p_state.h header defines all the state objects (such as polygon |
| rasterization options, blend modes, etc) and resources (drawing surfaces, |
| textures, memory buffers). The pipe interface uses "constant state" objects. |
| That is, state objects are created once and are immutable. State objects are |
| put into effect by binding them. This allows Gallium3D drivers to create |
| corresponding hardware state objects which can be quickly handled. |
| |
| The p_defines.h header defines numerous constants and tokens (blend modes, |
| texture wrap modes, surface formats, etc. |
| |
| The p_winsys.h header defines the window system and OS facilities which |
| Gallium3D drivers rely upon. For example, memory allocation is typically a |
| service the OS provides while window size/position information is provided by |
| the window system. Pipe drivers use the winsys interface to handle these |
| things. |
| |
| By abstracting OS and window system services, pipe drivers are portable to |
| other platforms (e.g. embedded devices). |
| */ |
| |
| /** \page statetracker The State Tracker |
| |
| The state tracker is the piece which interfaces core Mesa to the Gallium3D |
| interface. It's responsible for translating Mesa state (blend modes, texture |
| state, etc) and drawing commands (like glDrawArrays and glDrawPixels) into |
| pipe objects and operations. |
| |
| Traditional fixed-function OpenGL components (such as lighting and texture |
| combining) are implemented with shaders. OpenGL commands such as glDrawPixels |
| are translated into textured quadrilateral rendering. Basically, any |
| rendering operation that isn't directly supported by modern graphics hardware |
| is translated into a hardware-friendly form. |
| |
| Future state trackers will be created for OpenGL 3.0 and OpenGL-ES 2.x. |
| */ |
| |
| /** \page softpipe Softpipe Driver |
| |
| The softpipe driver is a software implementation of the Gallium3D interface. |
| It will be used as a reference implementation and as a fallback driver when a |
| hardware driver isn't available. The softpipe driver will make extensive use |
| of run-time code generation to efficiently execute vertex, fragment and |
| rasterization operations. |
| |
| \sa sp_winsys.h |
| */ |
| |
| /** \page i915g i915 Driver |
| |
| The i915 Gallium3D Driver is an initial hardware driver implementation within |
| the Gallium3D driver architecture. We expect that once complete this driver |
| will have equivalent functionality and performance to the current Mesa |
| i915tex driver, but from a much smaller codebase. |
| |
| \sa i915_context.h |
| \sa i915_winsys.h |
| */ |
| |
| /** \page failover Failover Module |
| |
| The failover module acts as a selector between a hardware driver and the |
| softpipe driver. When the hardware can't implement a particular rendering |
| operation, the failover module will pass the request to the softpipe driver. |
| This is a different solution to the "software fallbacks" scheme of previous |
| Mesa drivers. |
| |
| \sa fo_winsys.h |
| */ |
| |
| /** \page draw Draw Module |
| The Draw module provides point/line/polygon rendering services such as |
| vertex transformation, polygon culling and clipping. It will be used by |
| drivers for hardware which lacks vertex transformation (such as the |
| i915/i945). It may also be instantiated and used directly by the state |
| tracker to implement some API functionality that doesn't map well to hardware |
| capabilities. |
| |
| The interface of this module corresponds closely to the subset of the Gallium |
| Driver Interface which is relevent to these steps in the pipeline. Specifically |
| there are calls for: |
| |
| - Vertex shader constant state objects |
| - Vertex buffer binding |
| - Vertex element layout (vertex fetch) constant state objects |
| - DrawArrays and DrawElements |
| - Rasterizer constant state objects. |
| |
| The Draw module is effectively the part of \ref softpipe which is concerned with |
| vertex processing, split off into a separate module so that it can be reused |
| by drivers for rasterization-only hardware. As such it is also instantiated |
| by the \ref i915g driver. |
| |
| Additionally, there are cases in the Mesa OpenGL state_tracker where it is |
| required to obtain transformed vertices and yet it is anticipated that using |
| hardware transformation even if available would reduce performance, usually |
| because the setup costs or latency are prohibitive. For this reason the Mesa |
| state_tracker also instantiates a copy of this module. |
| |
| \sa draw_context.h |
| */ |
| |
| /** \page tgsi TGSI |
| |
| The TGSI module provides a universal representation of shaders and |
| CPU-based execution of shaders. All Mesa vertex/fragment programs and shaders |
| are translated into the TGSI representation before being passed to the |
| driver. In turn, the driver will convert the TGSI instructions into |
| GPU-specific instructions. For hardware that lacks vertex or fragment shader |
| support, the TGSI's executor can be used. The TGSI executor includes support |
| for SSE code generation. Support for other processors (such as Cell) will be |
| added in the future. |
| |
| \sa tgsi_parse.h |
| \sa <a href="http://www.tungstengraphics.com/wiki/files/tgsi.pdf">TGSI specification</a> |
| */ |
| |
| /** \page callgraph Glxgears callgraph example |
| |
| Below is a call graph of the glxgears application together with the Gallium3D's softpipe reference driver. |
| |
| \htmlonly |
| The functions in the graph below are clickable. |
| \endhtmlonly |
| |
| \dot |
| digraph { |
| graph [fontname=Arial, fontsize=10]; |
| node [fontcolor=white, fontname=Arial, style=filled, fontsize=10, shape=box]; |
| edge [fontname=Arial, fontsize=10]; |
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| 1 -> 2 [color="#fe0400", fontcolor="#fe0400", label="99.32%\n1433"]; |
| 2 [color="#fe0400", URL="\ref do_draw", label="do_draw\n99.32% (0.00%)\n1433"]; |
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| 2 -> 39 [color="#0d4f76", fontcolor="#0d4f76", label="2.45%\n1433"]; |
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| 3 -> 5 [color="#f91301", fontcolor="#f91301", label="96.38%\n17196"]; |
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| 9 [color="#f32a02", URL="\ref cull_tri", label="cull_tri\n91.88% (0.20%)\n1261040"]; |
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| 9 -> 12 [color="#0d805e", fontcolor="#0d805e", label="10.57%\n560810"]; |
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| 11 [color="#ec3f03", URL="\ref softpipe_draw_elements", label="softpipe_draw_elements\n87.48% (0.10%)\n30093"]; |
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| 13 [color="#e74e04", URL="\ref flatshade_tri", label="flatshade_tri\n84.25% (0.29%)\n1146400"]; |
| 13 -> 8 [color="#e75004", fontcolor="#e75004", label="83.95%\n1146400"]; |
| 14 [color="#e35c04", URL="\ref shade_quad", label="shade_quad\n81.31% (7.73%)\n15910811"]; |
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| 14 -> 26 [color="#0c883c", fontcolor="#0c883c", label="16.24%\n15910811"]; |
| 15 [color="#e35d04", URL="\ref setup_tri", label="setup_tri\n81.12% (1.47%)\n560810"]; |
| 15 -> 16 [color="#e06505", fontcolor="#e06505", label="79.26%\n1121620"]; |
| 16 [color="#e06505", URL="\ref subtriangle", label="subtriangle\n79.26% (3.91%)\n1121620"]; |
| 16 -> 12 [color="#da7606", fontcolor="#da7606", label="75.34%\n4025366"]; |
| 17 [color="#cf9507", URL="\ref draw_arrays", label="draw_arrays\n67.61% (0.00%)\n30093"]; |
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| 18 [color="#cf9607", URL="\ref do_ef_triangle", label="do_ef_triangle\n67.42% (0.49%)\n1261040"]; |
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| 19 [color="#cf9607", URL="\ref do_quad", label="do_quad\n67.42% (0.00%)\n630520"]; |
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| 20 -> 7 [color="#cd9907", fontcolor="#cd9907", label="66.54%\n71650"]; |
| 21 [color="#c0bb09", URL="\ref depth_test_quad", label="depth_test_quad\n57.24% (1.08%)\n13903725"]; |
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| 24 -> 44 [color="#0d4c76", fontcolor="#0d4c76", label="2.25%\n13903725"]; |
| 25 [color="#0c8c2b", URL="\ref write_quad_f_swz", label="write_quad_f_swz\n19.28% (16.14%)\n13074127"]; |
| 25 -> 38 [color="#0d5877", fontcolor="#0d5877", label="3.13%\n26148254"]; |
| 26 [color="#0c883a", URL="\ref tgsi_exec_machine_init", label="tgsi_exec_machine_init\n16.73% (10.27%)\n16326381"]; |
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| 29 [color="#0d737a", URL="\ref get_row_rgba", label="get_row_rgba\n5.48% (5.48%)\n14446870"]; |
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| 33 [color="#0d5f78", URL="\ref softpipe_set_vertex_buffer", label="softpipe_set_vertex_buffer\n3.72% (0.00%)\n34392"]; |
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| 38 [color="#0d5877", URL="\ref put_row_8R8G8B_ximage", label="put_row_8R8G8B_ximage\n3.13% (3.13%)\n26148254"]; |
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| 41 [color="#0d4d76", URL="\ref xmesa_clear", label="xmesa_clear\n2.35% (0.00%)\n2866"]; |
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| 43 [color="#0d4c76", URL="\ref sp_region_fill", label="sp_region_fill\n2.25% (2.25%)\n1433"]; |
| 44 [color="#0d4c76", URL="\ref s8z24_write_quad_z", label="s8z24_write_quad_z\n2.25% (2.25%)\n13903725"]; |
| 45 [color="#0d4475", URL="\ref tgsi_parse_free", label="tgsi_parse_free\n1.76% (0.78%)\n16326383"]; |
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| 50 [color="#0d3674", URL="\ref draw_set_rasterizer_state", label="draw_set_rasterizer_state\n0.98% (0.00%)\n8599"]; |
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| 51 -> 50 [color="#0d3674", fontcolor="#0d3674", label="0.98%\n8599"]; |
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| 53 [color="#0d2f74", URL="\ref draw_vertex_fetch", label="draw_vertex_fetch\n0.68% (0.68%)\n415570"]; |
| } |
| |
| \enddot |
| |
| The graph above was generated by the <a href="http://code.google.com/p/jrfonseca/wiki/Gprof2Dot">gprof2dot.py script</a>. |
| */ |