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i965: Enable ARB_compute_shader extension on supported hardware

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Enable ARB_compute_shader on gen7+, on hardware that supports the
OpenGL 4.3 requirements of a local group size of 1024.

With SIMD16 support, this is limited to Ivy Bridge and Haswell.

Broadwell will work with a local group size up to 896 on SIMD16
meaning programs that use this size or lower should run when setting
MESA_EXTENSION_OVERRIDE=GL_ARB_compute_shader.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
This commit is contained in:
Jordan Justen 2015-09-02 15:47:33 -07:00
parent e288b4a133
commit d04612b60d
2 changed files with 8 additions and 5 deletions
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11
src/mesa/drivers/dri/i965/brw_context.c
View file

@ -349,7 +349,9 @@ brw_initialize_context_constants(struct brw_context *brw)
[MESA_SHADER_TESS_EVAL] = brw->gen >= 8,
[MESA_SHADER_GEOMETRY] = brw->gen >= 6,
[MESA_SHADER_FRAGMENT] = true,
[MESA_SHADER_COMPUTE] = _mesa_extension_override_enables.ARB_compute_shader,
[MESA_SHADER_COMPUTE] =
(ctx->Const.MaxComputeWorkGroupSize[0] >= 1024) ||
_mesa_extension_override_enables.ARB_compute_shader,
};
unsigned num_stages = 0;
@ -638,7 +640,7 @@ brw_initialize_context_constants(struct brw_context *brw)
}
static void
brw_adjust_cs_context_constants(struct brw_context *brw)
brw_initialize_cs_context_constants(struct brw_context *brw, unsigned max_threads)
{
struct gl_context *ctx = &brw->ctx;
@ -652,7 +654,7 @@ brw_adjust_cs_context_constants(struct brw_context *brw)
*/
const int simd_size = ctx->API == API_OPENGL_CORE ? 16 : 8;
const uint32_t max_invocations = simd_size * brw->max_cs_threads;
const uint32_t max_invocations = simd_size * max_threads;
ctx->Const.MaxComputeWorkGroupSize[0] = max_invocations;
ctx->Const.MaxComputeWorkGroupSize[1] = max_invocations;
ctx->Const.MaxComputeWorkGroupSize[2] = max_invocations;
@ -844,6 +846,7 @@ brwCreateContext(gl_api api,
if (INTEL_DEBUG & DEBUG_PERF)
brw->perf_debug = true;
brw_initialize_cs_context_constants(brw, devinfo->max_cs_threads);
brw_initialize_context_constants(brw);
ctx->Const.ResetStrategy = notify_reset
@ -898,8 +901,6 @@ brwCreateContext(gl_api api,
brw->urb.max_ds_entries = devinfo->urb.max_ds_entries;
brw->urb.max_gs_entries = devinfo->urb.max_gs_entries;
brw_adjust_cs_context_constants(brw);
/* Estimate the size of the mappable aperture into the GTT. There's an
* ioctl to get the whole GTT size, but not one to get the mappable subset.
* It turns out it's basically always 256MB, though some ancient hardware

2
src/mesa/drivers/dri/i965/intel_extensions.c
View file

@ -355,6 +355,8 @@ intelInitExtensions(struct gl_context *ctx)
ctx->Extensions.ARB_viewport_array = true;
ctx->Extensions.AMD_vertex_shader_viewport_index = true;
ctx->Extensions.ARB_shader_subroutine = true;
if (ctx->Const.MaxComputeWorkGroupSize[0] >= 1024)
ctx->Extensions.ARB_compute_shader = true;
}
}