gallium: Add a helper for implementing PIPE_CAP_* default values.

One of the pains of implementing a gallium driver is filling in a million
pipe caps you don't know about yet when you're just starting out.  One of
the pains of working on gallium is copy-and-pasting your new PIPE_CAP into
each driver.  We can fix both of these by having each driver call into the
default helper from their default case, so that both sides can ignore each
other until they need to.

v2: fix i915g build, revert swr change to avoid breaking scons build
    (https://travis-ci.org/anholt/mesa/jobs/419739857)
v3: Rebase on 3 new gallium caps.

Reviewed-by: Marek Olšák <[email protected]> (v1)
Cc: Bruce Cherniak <[email protected]>
Cc: George Kyriazis <[email protected]>
Cc: Kenneth Graunke <[email protected]>

4 files changed, 358 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index 626cde123af..d66fa85f798 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -317,6 +317,8 @@ C_SOURCES := \
 	util/u_ringbuffer.h \
 	util/u_sampler.c \
 	util/u_sampler.h \
+	util/u_screen.c \
+	util/u_screen.h \
 	util/u_simple_shaders.c \
 	util/u_simple_shaders.h \
 	util/u_split_prim.h \
diff --git a/src/gallium/auxiliary/meson.build b/src/gallium/auxiliary/meson.build
index 858c9d0c79c..be558e07b27 100644
--- a/src/gallium/auxiliary/meson.build
+++ b/src/gallium/auxiliary/meson.build
@@ -337,6 +337,8 @@ files_libgallium = files(
   'util/u_ringbuffer.h',
   'util/u_sampler.c',
   'util/u_sampler.h',
+  'util/u_screen.c',
+  'util/u_screen.h',
   'util/u_simple_shaders.c',
   'util/u_simple_shaders.h',
   'util/u_split_prim.h',
diff --git a/src/gallium/auxiliary/util/u_screen.c b/src/gallium/auxiliary/util/u_screen.c
new file mode 100644
index 00000000000..8c0a1297f2a
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_screen.c
@@ -0,0 +1,325 @@
+/*
+ * Copyright © 2018 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "pipe/p_screen.h"
+#include "util/u_screen.h"
+
+/**
+ * Helper to use from a pipe_screen->get_param() implementation to return
+ * default values for unsupported PIPE_CAPs.
+ *
+ * Call this function from your pipe_screen->get_param() implementation's
+ * default case, so that implementors of new pipe caps don't need to
+ */
+int
+u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
+                                 enum pipe_cap param)
+{
+   /* Let's keep these sorted by position in p_defines.h. */
+   switch (param) {
+   case PIPE_CAP_NPOT_TEXTURES:
+   case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
+   case PIPE_CAP_ANISOTROPIC_FILTER:
+   case PIPE_CAP_POINT_SPRITE:
+      return 0;
+
+   case PIPE_CAP_MAX_RENDER_TARGETS:
+      return 1;
+
+   case PIPE_CAP_OCCLUSION_QUERY:
+   case PIPE_CAP_QUERY_TIME_ELAPSED:
+   case PIPE_CAP_TEXTURE_SWIZZLE:
+      return 0;
+
+   case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
+   case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
+      unreachable("driver must implement these.");
+
+   case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
+   case PIPE_CAP_BLEND_EQUATION_SEPARATE:
+   case PIPE_CAP_SM3:
+   case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS: /* enables EXT_transform_feedback */
+   case PIPE_CAP_PRIMITIVE_RESTART:
+   case PIPE_CAP_INDEP_BLEND_ENABLE:
+   case PIPE_CAP_INDEP_BLEND_FUNC:
+      return 0;
+
+   case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
+      unreachable("driver must implement these.");
+
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
+   case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
+   case PIPE_CAP_DEPTH_CLIP_DISABLE:
+   case PIPE_CAP_SHADER_STENCIL_EXPORT:
+   case PIPE_CAP_TGSI_INSTANCEID:
+   case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
+   case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
+   case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
+   case PIPE_CAP_SEAMLESS_CUBE_MAP:
+   case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
+      return 0;
+
+   case PIPE_CAP_MIN_TEXEL_OFFSET:
+      /* GL 3.x minimum value. */
+      return -8;
+   case PIPE_CAP_MAX_TEXEL_OFFSET:
+      return 7;
+
+   case PIPE_CAP_CONDITIONAL_RENDER:
+   case PIPE_CAP_TEXTURE_BARRIER:
+      return 0;
+
+   case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
+      /* GL_EXT_transform_feedback minimum value. */
+      return 4;
+   case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
+      return 64;
+
+   case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
+   case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
+   case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
+   case PIPE_CAP_VERTEX_COLOR_CLAMPED:
+      return 0;
+
+   case PIPE_CAP_GLSL_FEATURE_LEVEL:
+   case PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY:
+      /* Minimum GLSL level implemented by gallium drivers. */
+      return 120;
+
+   case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
+   case PIPE_CAP_USER_VERTEX_BUFFERS:
+   case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
+   case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
+   case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
+   case PIPE_CAP_COMPUTE:
+      return 0;
+
+   case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+      /* GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT default value. */
+      return 1;
+
+   case PIPE_CAP_START_INSTANCE:
+   case PIPE_CAP_QUERY_TIMESTAMP:
+   case PIPE_CAP_TEXTURE_MULTISAMPLE:
+      return 0;
+
+   case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
+      /* GL_ARB_map_buffer_alignment minimum value. All drivers expose the
+       * extension.
+       */
+      return 64;
+
+   case PIPE_CAP_CUBE_MAP_ARRAY:
+   case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
+      return 0;
+
+   case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
+      /* GL_EXT_texture_buffer minimum value. */
+      return 256;
+
+   case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
+   case PIPE_CAP_TGSI_TEXCOORD:
+      return 0;
+
+   case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
+      return 1;
+
+   case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
+   case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
+      return 0;
+
+   case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+      /* GL_EXT_texture_buffer minimum value. */
+      return 65536;
+
+   case PIPE_CAP_MAX_VIEWPORTS:
+      return 1;
+
+   case PIPE_CAP_ENDIANNESS:
+      return PIPE_ENDIAN_LITTLE;
+
+   case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
+   case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
+   case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
+   case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
+   case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS: /* Enables ARB_texture_gather */
+   case PIPE_CAP_TEXTURE_GATHER_SM5:
+   case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
+   case PIPE_CAP_FAKE_SW_MSAA:
+   case PIPE_CAP_TEXTURE_QUERY_LOD:
+      return 0;
+
+   case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
+      return -8;
+   case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
+      return 7;
+
+   case PIPE_CAP_SAMPLE_SHADING:
+   case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
+   case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
+   case PIPE_CAP_MAX_VERTEX_STREAMS:
+   case PIPE_CAP_DRAW_INDIRECT:
+   case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
+      return 0;
+
+   case PIPE_CAP_VENDOR_ID:
+   case PIPE_CAP_DEVICE_ID:
+      return 0xffffffff;
+
+   case PIPE_CAP_ACCELERATED:
+   case PIPE_CAP_VIDEO_MEMORY:
+   case PIPE_CAP_UMA:
+      unreachable("driver must implement these.");
+
+   case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
+      return 0;
+
+   case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
+      /* GL minimum value */
+      return 2048;
+
+   case PIPE_CAP_SAMPLER_VIEW_TARGET:
+   case PIPE_CAP_CLIP_HALFZ:
+   case PIPE_CAP_VERTEXID_NOBASE:
+   case PIPE_CAP_POLYGON_OFFSET_CLAMP:
+   case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
+   case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
+   case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
+   case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
+   case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
+   case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
+   case PIPE_CAP_DEPTH_BOUNDS_TEST:
+   case PIPE_CAP_TGSI_TXQS:
+   case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
+   case PIPE_CAP_SHAREABLE_SHADERS:
+   case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
+   case PIPE_CAP_CLEAR_TEXTURE:
+   case PIPE_CAP_DRAW_PARAMETERS:
+   case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
+   case PIPE_CAP_MULTI_DRAW_INDIRECT:
+   case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
+   case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
+   case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
+      return 0;
+
+   case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
+      /* Enables GL_ARB_shader_storage_buffer_object */
+      return 0;
+
+   case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
+   case PIPE_CAP_STRING_MARKER:
+   case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
+   case PIPE_CAP_QUERY_BUFFER_OBJECT:
+   case PIPE_CAP_QUERY_MEMORY_INFO: /* Enables GL_ATI_meminfo */
+      return 0;
+
+   case PIPE_CAP_PCI_GROUP:
+   case PIPE_CAP_PCI_BUS:
+   case PIPE_CAP_PCI_DEVICE:
+   case PIPE_CAP_PCI_FUNCTION:
+      unreachable("driver must implement these.");
+
+   case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
+   case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+   case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
+   case PIPE_CAP_TGSI_VOTE:
+   case PIPE_CAP_MAX_WINDOW_RECTANGLES: /* Enables EXT_window_rectangles */
+   case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
+   case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
+   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
+   case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
+   case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
+   case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
+   case PIPE_CAP_NATIVE_FENCE_FD:
+      return 0;
+
+   case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
+      return 1;
+
+   case PIPE_CAP_TGSI_FS_FBFETCH:
+   case PIPE_CAP_TGSI_MUL_ZERO_WINS:
+   case PIPE_CAP_DOUBLES:
+   case PIPE_CAP_INT64:
+   case PIPE_CAP_INT64_DIVMOD:
+   case PIPE_CAP_TGSI_TEX_TXF_LZ:
+   case PIPE_CAP_TGSI_CLOCK:
+   case PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE:
+   case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
+   case PIPE_CAP_TGSI_BALLOT:
+   case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
+   case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
+      return 0;
+
+   case PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION:
+      /* Drivers generally support this, and it reduces GL overhead just to
+       * throw an error when buffers are mapped.
+       */
+      return 1;
+
+   case PIPE_CAP_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_BINDLESS_TEXTURE:
+   case PIPE_CAP_NIR_SAMPLERS_AS_DEREF:
+   case PIPE_CAP_QUERY_SO_OVERFLOW:
+   case PIPE_CAP_MEMOBJ:
+   case PIPE_CAP_LOAD_CONSTBUF:
+   case PIPE_CAP_TGSI_ANY_REG_AS_ADDRESS:
+   case PIPE_CAP_TILE_RASTER_ORDER:
+      return 0;
+
+   case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
+      /* nonzero overrides defaults */
+      return 0;
+
+   case PIPE_CAP_FRAMEBUFFER_MSAA_CONSTRAINTS:
+   case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
+   case PIPE_CAP_CONTEXT_PRIORITY_MASK:
+   case PIPE_CAP_FENCE_SIGNAL:
+   case PIPE_CAP_CONSTBUF0_FLAGS:
+   case PIPE_CAP_PACKED_UNIFORMS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_SNAP_POINTS_LINES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_TRIANGLES:
+   case PIPE_CAP_CONSERVATIVE_RASTER_PRE_SNAP_POINTS_LINES:
+   case PIPE_CAP_MAX_CONSERVATIVE_RASTER_SUBPIXEL_PRECISION_BIAS:
+   case PIPE_CAP_CONSERVATIVE_RASTER_POST_DEPTH_COVERAGE:
+   case PIPE_CAP_PROGRAMMABLE_SAMPLE_LOCATIONS:
+      return 0;
+
+   case PIPE_CAP_MAX_GS_INVOCATIONS:
+      return 32;
+
+   case PIPE_CAP_MAX_SHADER_BUFFER_SIZE:
+      return 1 << 27;
+
+   case PIPE_CAP_TEXTURE_MIRROR_CLAMP_TO_EDGE:
+      return 0;
+
+   default:
+      unreachable("bad PIPE_CAP_*");
+   }
+}
diff --git a/src/gallium/auxiliary/util/u_screen.h b/src/gallium/auxiliary/util/u_screen.h
new file mode 100644
index 00000000000..65afb277ef3
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_screen.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright © 2018 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+struct pipe_screen;
+enum pipe_cap;
+
+int
+u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
+                                 enum pipe_cap param);