[Mesa-dev] [PATCH 5/6] mesa: Implement a new GL_MESA_tile_raster_order extension.

Eric Anholt eric at anholt.net
Fri Jul 28 02:30:03 UTC 2017


The intent is to use this extension on vc4 to allow X11 to do overlapping
CopyArea() within a pixmap without first blitting the pixmap to a
temporary.  With associated glamor patches, improves x11perf
-copywinwin100 performance on a Raspberry Pi 3 from ~4700/sec to
~5130/sec, and is an even larger boost to uncomposited window movement
performance (most copywinwin100 copies don't overlap).
---
 docs/specs/MESA_tile_raster_order.spec        | 101 ++++++++++++++++++++++++++
 docs/specs/enums.txt                          |   5 ++
 include/GL/glext.h                            |   6 ++
 src/mapi/glapi/gen/MESA_tile_raster_order.xml |  13 ++++
 src/mapi/glapi/gen/Makefile.am                |   1 +
 src/mesa/main/context.c                       |   2 +
 src/mesa/main/enable.c                        |  27 +++++++
 src/mesa/main/extensions_table.h              |   1 +
 src/mesa/main/mtypes.h                        |  13 ++++
 src/mesa/state_tracker/st_atom_rasterizer.c   |   5 ++
 src/mesa/state_tracker/st_context.c           |   1 +
 src/mesa/state_tracker/st_extensions.c        |   1 +
 12 files changed, 176 insertions(+)
 create mode 100644 docs/specs/MESA_tile_raster_order.spec
 create mode 100644 src/mapi/glapi/gen/MESA_tile_raster_order.xml

diff --git a/docs/specs/MESA_tile_raster_order.spec b/docs/specs/MESA_tile_raster_order.spec
new file mode 100644
index 000000000000..b6362fc7e5a6
--- /dev/null
+++ b/docs/specs/MESA_tile_raster_order.spec
@@ -0,0 +1,101 @@
+Name
+
+    MESA_tile_raster_order
+
+Name Strings
+
+    GL_MESA_tile_raster_order
+
+Contact
+
+    Eric Anholt, Broadcom (eric at anholt.net)
+
+Status
+
+    Proposal
+
+Version
+
+    Last modified date: 26 July 2017
+
+Number
+
+    TBD
+
+Dependencies
+
+    GL_ARB_texture_barrier is required
+
+Overview
+
+    This extension extends the sampling-from-the-framebuffer behavior provided
+    by GL_ARB_texture_barrier to allow setting the rasterization order of the
+    scene, so that overlapping blits can be implemented.  This can be used for
+    scrolling or window movement within in 2D scenes, without first copying to
+    a temporary.
+
+IP Status
+
+    None
+
+Issues
+
+    1.  Should this extension also affect BlitFramebuffer?
+
+        NOT RESOLVED: BlitFramebuffer could use the same underlying
+        functionality to provide defined results for 1:1 overlapping blits,
+        but one could use the coordinates being copied to just produce the
+        right result automatically, rather than requiring the state flags to
+        be adjusted.
+
+New Procedures and Functions
+
+    None
+
+New Tokens
+
+    None
+
+Additions to Chapter 9 of the OpenGL 4.4 Specification (Per-Fragment
+Operations and the Frame Buffer)
+
+    Modify Section 9.3.1 Rendering Feedback Loops, p. 289
+
+    Add the following exception to the list after "There is only a single read
+    and write...":
+
+    - TILE_RASTER_ORDER_FIXED_MESA is enabled, and reads are only performed
+      from texels offset from the current fragment shader invocation in the
+      direction specified by TILE_RASTER_ORDER_INCREASING_X_MESA and
+      TILE_RASTER_ORDER_INCREASING_Y_MESA (where those being disabled mean
+      negative texel offsets), e.g. using "texelFetch2D(sampler,
+      ivec2(gl_FragCoord.xy + vec2(dx, dy)), 0);".
+
+Additions to the AGL/GLX/WGL Specifications
+
+    None
+
+GLX Protocol
+
+    None
+
+Errors
+
+    None
+
+New State
+
+    Get Value                            Type    Get Command    Initial Value Description                  Section   Attribute
+    -----------------------------------  ------  -------------  ------------- ---------------------------  --------  ------------
+    TILE_RASTER_ORDER_FIXED_MESA         B       IsEnabled      True          Tile rasterization order is  9.3.1     enable
+                                                                              defined by
+                                                                              TILE_RASTER_ORDER_INCREASING_*_MESA.
+                                                                              in increasing X direction
+    TILE_RASTER_ORDER_INCREASING_X_MESA  B       IsEnabled      True          Tiles are rasterized         9.3.1     enable
+                                                                              in increasing X direction
+    TILE_RASTER_ORDER_INCREASING_Y_MESA  B       IsEnabled      True          Tiles are rasterized         9.3.1     enable
+                                                                              in increasing Y direction
+
+Revision History
+
+    26 July 2017 - Initial draft
diff --git a/docs/specs/enums.txt b/docs/specs/enums.txt
index 00d808483a43..4b0485f34901 100644
--- a/docs/specs/enums.txt
+++ b/docs/specs/enums.txt
@@ -73,6 +73,11 @@ GL_MESA_program_debug
 	GL_FRAGMENT_PROGRAM_CALLBACK_FUNC_MESA	0x8BB6
 	GL_FRAGMENT_PROGRAM_CALLBACK_DATA_MESA	0x8BB7
 
+GL_MESA_tile_raster_order
+	GL_TILE_RASTER_ORDER_FIXED_MESA		0x8BB8
+	GL_TILE_RASTER_ORDER_INCREASING_X_MESA	0x8BB9
+	GL_TILE_RASTER_ORDER_INCREASING_Y_MESA	0x8BBA
+
 EGL_MESA_drm_image
         EGL_DRM_BUFFER_FORMAT_MESA		0x31D0
         EGL_DRM_BUFFER_USE_MESA			0x31D1
diff --git a/include/GL/glext.h b/include/GL/glext.h
index b7f611907211..a00f42c536b4 100644
--- a/include/GL/glext.h
+++ b/include/GL/glext.h
@@ -12403,6 +12403,12 @@ GLAPI void APIENTRY glReplacementCodeuiTexCoord2fColor4fNormal3fVertex3fvSUN (co
 #define GL_FOG_SPECULAR_TEXTURE_WIN       0x80EC
 #endif /* GL_WIN_specular_fog */
 
+/* XXX: Get a regenerated header with the enums properly present. */
+#define GL_TILE_RASTER_ORDER_FIXED_MESA          0x8BB8
+#define GL_TILE_RASTER_ORDER_INCREASING_X_MESA   0x8BB9
+#define GL_TILE_RASTER_ORDER_INCREASING_Y_MESA   0x8BBA
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/mapi/glapi/gen/MESA_tile_raster_order.xml b/src/mapi/glapi/gen/MESA_tile_raster_order.xml
new file mode 100644
index 000000000000..a1f0cb89bee4
--- /dev/null
+++ b/src/mapi/glapi/gen/MESA_tile_raster_order.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<!DOCTYPE OpenGLAPI SYSTEM "gl_API.dtd">
+
+<OpenGLAPI>
+
+<!-- XXX: need an extension number -->
+<category name="GL_MESA_tile_rasterizer_order">
+    <enum name="TILE_RASTER_ORDER_FIXED_MESA"              value="0x8BB8"/>
+    <enum name="TILE_RASTER_ORDER_INCREASING_X_MESA"       value="0x8BB9"/>
+    <enum name="TILE_RASTER_ORDER_INCREASING_Y_MESA"       value="0x8BBA"/>
+</category>
+
+</OpenGLAPI>
diff --git a/src/mapi/glapi/gen/Makefile.am b/src/mapi/glapi/gen/Makefile.am
index bd04519f8042..45f30b7819c5 100644
--- a/src/mapi/glapi/gen/Makefile.am
+++ b/src/mapi/glapi/gen/Makefile.am
@@ -208,6 +208,7 @@ API_XML = \
 	KHR_robustness.xml \
 	KHR_robustness_es.xml \
 	KHR_texture_compression_astc.xml \
+	MESA_tile_raster_order.xml \
 	NV_conditional_render.xml \
 	NV_primitive_restart.xml \
 	NV_texture_barrier.xml \
diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index fe527a0ae29b..f744801fc730 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -864,6 +864,8 @@ init_attrib_groups(struct gl_context *ctx)
    _mesa_init_texture_s3tc( ctx );
 
    /* Miscellaneous */
+   ctx->TileRasterOrderIncreasingX = GL_TRUE;
+   ctx->TileRasterOrderIncreasingY = GL_TRUE;
    ctx->NewState = _NEW_ALL;
    ctx->NewDriverState = ~0;
    ctx->ErrorValue = GL_NO_ERROR;
diff --git a/src/mesa/main/enable.c b/src/mesa/main/enable.c
index 2e5fb009314d..6d419b0013fa 100644
--- a/src/mesa/main/enable.c
+++ b/src/mesa/main/enable.c
@@ -1040,6 +1040,33 @@ _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
          }
          break;
 
+      case GL_TILE_RASTER_ORDER_FIXED_MESA:
+         CHECK_EXTENSION(MESA_tile_raster_order, cap);
+         if (ctx->TileRasterOrderFixed != state) {
+            FLUSH_VERTICES(ctx, 0);
+            ctx->NewDriverState |= ctx->DriverFlags.NewTileRasterOrder;
+            ctx->TileRasterOrderFixed = state;
+         }
+         break;
+
+      case GL_TILE_RASTER_ORDER_INCREASING_X_MESA:
+         CHECK_EXTENSION(MESA_tile_raster_order, cap);
+         if (ctx->TileRasterOrderIncreasingX != state) {
+            FLUSH_VERTICES(ctx, 0);
+            ctx->NewDriverState |= ctx->DriverFlags.NewTileRasterOrder;
+            ctx->TileRasterOrderIncreasingX = state;
+         }
+         break;
+
+      case GL_TILE_RASTER_ORDER_INCREASING_Y_MESA:
+         CHECK_EXTENSION(MESA_tile_raster_order, cap);
+         if (ctx->TileRasterOrderIncreasingY != state) {
+            FLUSH_VERTICES(ctx, 0);
+            ctx->NewDriverState |= ctx->DriverFlags.NewTileRasterOrder;
+            ctx->TileRasterOrderIncreasingY = state;
+         }
+         break;
+
       /* GL 3.1 primitive restart.  Note: this enum is different from
        * GL_PRIMITIVE_RESTART_NV (which is client state).
        */
diff --git a/src/mesa/main/extensions_table.h b/src/mesa/main/extensions_table.h
index 757b7bf94239..08f7a3f49f07 100644
--- a/src/mesa/main/extensions_table.h
+++ b/src/mesa/main/extensions_table.h
@@ -310,6 +310,7 @@ EXT(KHR_texture_compression_astc_hdr        , KHR_texture_compression_astc_hdr
 EXT(KHR_texture_compression_astc_ldr        , KHR_texture_compression_astc_ldr       , GLL, GLC,  x , ES2, 2012)
 EXT(KHR_texture_compression_astc_sliced_3d  , KHR_texture_compression_astc_sliced_3d , GLL, GLC,  x , ES2, 2015)
 
+EXT(MESA_tile_raster_order                  , MESA_tile_raster_order                 , GLL, GLC,  x , ES2, 2017)
 EXT(MESA_pack_invert                        , MESA_pack_invert                       , GLL, GLC,  x ,  x , 2002)
 EXT(MESA_shader_integer_functions           , MESA_shader_integer_functions          , GLL, GLC,  x ,  30, 2016)
 EXT(MESA_texture_signed_rgba                , EXT_texture_snorm                      , GLL, GLC,  x ,  x , 2009)
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 0d0536c7750e..34be919102ee 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -4166,6 +4166,7 @@ struct gl_extensions
    GLboolean KHR_texture_compression_astc_hdr;
    GLboolean KHR_texture_compression_astc_ldr;
    GLboolean KHR_texture_compression_astc_sliced_3d;
+   GLboolean MESA_tile_raster_order;
    GLboolean MESA_pack_invert;
    GLboolean MESA_shader_framebuffer_fetch;
    GLboolean MESA_shader_framebuffer_fetch_non_coherent;
@@ -4418,6 +4419,9 @@ struct gl_driver_flags
    /** gl_context::RasterDiscard */
    uint64_t NewRasterizerDiscard;
 
+   /** gl_context::TileRasterOrder* */
+   uint64_t NewTileRasterOrder;
+
    /**
     * gl_context::UniformBufferBindings
     * gl_shader_program::UniformBlocks
@@ -4958,6 +4962,15 @@ struct gl_context
    GLboolean IntelConservativeRasterization; /**< GL_INTEL_CONSERVATIVE_RASTERIZATION */
 
    /**
+    * When set, TileRasterOrderIncreasingX/Y control the order that a tiled
+    * renderer's tiles should be excecuted, to meet the requirements of
+    * GL_MESA_tile_raster_order.
+    */
+   GLboolean TileRasterOrderFixed;
+   GLboolean TileRasterOrderIncreasingX;
+   GLboolean TileRasterOrderIncreasingY;
+
+   /**
     * \name Hooks for module contexts.  
     *
     * These will eventually live in the driver or elsewhere.
diff --git a/src/mesa/state_tracker/st_atom_rasterizer.c b/src/mesa/state_tracker/st_atom_rasterizer.c
index 39be6b15a70e..4147340fd79a 100644
--- a/src/mesa/state_tracker/st_atom_rasterizer.c
+++ b/src/mesa/state_tracker/st_atom_rasterizer.c
@@ -277,6 +277,11 @@ void st_update_rasterizer( struct st_context *st )
 
    /* ST_NEW_RASTERIZER */
    raster->rasterizer_discard = ctx->RasterDiscard;
+   if (ctx->TileRasterOrderFixed) {
+      raster->tile_raster_order_fixed = true;
+      raster->tile_raster_order_increasing_x = ctx->TileRasterOrderIncreasingX;
+      raster->tile_raster_order_increasing_y = ctx->TileRasterOrderIncreasingY;
+   }
 
    if (st->edgeflag_culls_prims) {
       /* All edge flags are FALSE. Cull the affected faces. */
diff --git a/src/mesa/state_tracker/st_context.c b/src/mesa/state_tracker/st_context.c
index 381ff9dae00d..ac214175b2cb 100644
--- a/src/mesa/state_tracker/st_context.c
+++ b/src/mesa/state_tracker/st_context.c
@@ -488,6 +488,7 @@ static void st_init_driver_flags(struct st_context *st)
 
    f->NewArray = ST_NEW_VERTEX_ARRAYS;
    f->NewRasterizerDiscard = ST_NEW_RASTERIZER;
+   f->NewTileRasterOrder = ST_NEW_RASTERIZER;
    f->NewUniformBuffer = ST_NEW_UNIFORM_BUFFER;
    f->NewDefaultTessLevels = ST_NEW_TESS_STATE;
 
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index 74193cc49285..f0fe7c2bb674 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -646,6 +646,7 @@ void st_init_extensions(struct pipe_screen *screen,
       { o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE    },
       { o(ATI_separate_stencil),             PIPE_CAP_TWO_SIDED_STENCIL                },
       { o(ATI_texture_mirror_once),          PIPE_CAP_TEXTURE_MIRROR_CLAMP             },
+      { o(MESA_tile_raster_order),           PIPE_CAP_TILE_RASTER_ORDER                },
       { o(NV_conditional_render),            PIPE_CAP_CONDITIONAL_RENDER               },
       { o(NV_fill_rectangle),                PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE      },
       { o(NV_primitive_restart),             PIPE_CAP_PRIMITIVE_RESTART                },
-- 
2.13.3



More information about the mesa-dev mailing list