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mesa/st: Implement GL_TIME_ELAPSED w/ PIPE_QUERY_TIMESTAMP.

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ARB/EXT_timer_query's definition of GL_TIME_ELAPSED match precisely the
subtraction of two GL_TIMESTAMP queries.

And for a lot of drivers, that's precisely how they have to implement
internally -- by emitting two hardware timestamp queries.

So, to simplify driver implementation, simply allow doing so in the state
tracker.

Eventually if no driver implements PIPE_QUERY_TIME_ELAPSED then we could
retire it.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
José Fonseca
2012-12-09 10:08:13 +00:00
committed by José Fonseca
parent 9976216bf6
commit 3160b0b9fc
4 changed files with 79 additions and 22 deletions
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11
src/mesa/state_tracker/st_extensions.c
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@@ -371,6 +371,7 @@ void st_init_extensions(struct st_context *st)
{ o(ARB_shader_texture_lod), PIPE_CAP_SM3 },
{ o(ARB_shadow), PIPE_CAP_TEXTURE_SHADOW_MAP },
{ o(ARB_texture_non_power_of_two), PIPE_CAP_NPOT_TEXTURES },
{ o(ARB_timer_query), PIPE_CAP_QUERY_TIMESTAMP },
{ o(ARB_transform_feedback2), PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME },
{ o(ARB_transform_feedback3), PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME },
@@ -382,7 +383,6 @@ void st_init_extensions(struct st_context *st)
{ o(EXT_texture_filter_anisotropic), PIPE_CAP_ANISOTROPIC_FILTER },
{ o(EXT_texture_mirror_clamp), PIPE_CAP_TEXTURE_MIRROR_CLAMP },
{ o(EXT_texture_swizzle), PIPE_CAP_TEXTURE_SWIZZLE },
{ o(EXT_timer_query), PIPE_CAP_QUERY_TIME_ELAPSED },
{ o(EXT_transform_feedback), PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS },
{ o(AMD_seamless_cubemap_per_texture), PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE },
@@ -652,9 +652,12 @@ void st_init_extensions(struct st_context *st)
if (ctx->Const.MaxDualSourceDrawBuffers > 0)
ctx->Extensions.ARB_blend_func_extended = GL_TRUE;
if (screen->get_param(screen, PIPE_CAP_QUERY_TIME_ELAPSED) &&
screen->get_param(screen, PIPE_CAP_QUERY_TIMESTAMP)) {
ctx->Extensions.ARB_timer_query = GL_TRUE;
st->has_time_elapsed =
screen->get_param(screen, PIPE_CAP_QUERY_TIME_ELAPSED);
if (st->has_time_elapsed ||
ctx->Extensions.ARB_timer_query) {
ctx->Extensions.EXT_timer_query = GL_TRUE;
}
if (ctx->Extensions.ARB_transform_feedback2 &&