[Mesa-dev] [PATCH] forward precise-flag if supported

[Erik Faye-Lund]

New versions of virglrenderer supports the precise-flag, so let's
forward it from TGSI if that's the case.

This fixes a few dEQP-GLES31 tests:
- dEQP-GLES31.functional.tessellation.common_edge.quads_equal_spacing_precise
- dEQP-GLES31.functional.tessellation.common_edge.quads_fractional_even_spacing_precise
- dEQP-GLES31.functional.tessellation.common_edge.quads_fractional_odd_spacing_precise
- dEQP-GLES31.functional.tessellation.common_edge.triangles_equal_spacing_precise
- dEQP-GLES31.functional.tessellation.common_edge.triangles_fractional_even_spacing_precise
- dEQP-GLES31.functional.tessellation.common_edge.triangles_fractional_odd_spacing_precise

Signed-off-by: Erik Faye-Lund <erik.faye-lund at collabora.com>
---

This matches this virglrenderer-series, which has been merged upstrea:
https://patchwork.freedesktop.org/series/46361/

 src/gallium/drivers/virgl/virgl_hw.h   | 1 +
 src/gallium/drivers/virgl/virgl_tgsi.c | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/virgl/virgl_hw.h b/src/gallium/drivers/virgl/virgl_hw.h
index ee6aa68c5a..8f4f0ab6d8 100644
--- a/src/gallium/drivers/virgl/virgl_hw.h
+++ b/src/gallium/drivers/virgl/virgl_hw.h
@@ -203,6 +203,7 @@ enum virgl_formats {
 #define VIRGL_CAP_TEXTURE_VIEW         (1 << 1)
 #define VIRGL_CAP_SET_MIN_SAMPLES      (1 << 2)
 #define VIRGL_CAP_COPY_IMAGE           (1 << 3)
+#define VIRGL_CAP_TGSI_PRECISE         (1 << 4)
 
 #define VIRGL_BIND_DEPTH_STENCIL (1 << 0)
 #define VIRGL_BIND_RENDER_TARGET (1 << 1)
diff --git a/src/gallium/drivers/virgl/virgl_tgsi.c b/src/gallium/drivers/virgl/virgl_tgsi.c
index ff5abf6ddb..d1f785d4d2 100644
--- a/src/gallium/drivers/virgl/virgl_tgsi.c
+++ b/src/gallium/drivers/virgl/virgl_tgsi.c
@@ -31,6 +31,7 @@
 struct virgl_transform_context {
    struct tgsi_transform_context base;
    bool cull_enabled;
+   bool has_precise;
 };
 
 static void
@@ -76,7 +77,8 @@ static void
 virgl_tgsi_transform_instruction(struct tgsi_transform_context *ctx,
 				 struct tgsi_full_instruction *inst)
 {
-   if (inst->Instruction.Precise)
+   struct virgl_transform_context *vtctx = (struct virgl_transform_context *)ctx;
+   if (!vtctx->has_precise && inst->Instruction.Precise)
       inst->Instruction.Precise = 0;
 
    for (unsigned i = 0; i < inst->Instruction.NumSrcRegs; i++) {
@@ -104,6 +106,7 @@ struct tgsi_token *virgl_tgsi_transform(struct virgl_context *vctx, const struct
    transform.base.transform_property = virgl_tgsi_transform_property;
    transform.base.transform_instruction = virgl_tgsi_transform_instruction;
    transform.cull_enabled = vscreen->caps.caps.v1.bset.has_cull;
+   transform.has_precise = vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TGSI_PRECISE;
    tgsi_transform_shader(tokens_in, new_tokens, newLen, &transform.base);
 
    return new_tokens;
-- 
2.18.0