intel: Add flags to intel_context for hiz and separate stencil

Add the following flags:
    intel_context.has_separate_stencil
    intel_context.must_use_separate_stencil
    intel_context.has_hiz

The flags are currently set to false, and will be enabled for a given
chipset once the feature is completely implemented.

Since it may be some time before these features are completed, their
values can be overridden with environment variables INTEL_HIZ and
INTEL_SEPARATE_STENCIL. Valid values for these environment variables are
"0" and "1".

Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>
Signed-off-by: Chad Versace <[email protected]>

2 files changed, 58 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index 4516db20ffc..91cf5dbf44b 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -620,6 +620,53 @@ intelInitDriverFunctions(struct dd_function_table *functions)
    intel_init_syncobj_functions(functions);
 }
 
+/**
+ * Override intel->has_hiz with environment variable INTEL_HIZ.
+ *
+ * Valid values for INTEL_HIZ are "0" and "1". If an invalid valid value is
+ * encountered, a warning is emitted and INTEL_HIZ is ignored.
+ */
+static void
+intel_override_hiz(struct intel_context *intel)
+{
+   const char *s = getenv("INTEL_HIZ");
+   if (!s) {
+      return;
+   } else if (!strncmp("0", s, 2)) {
+      intel->has_hiz = false;
+   } else if (!strncmp("1", s, 2)) {
+      intel->has_hiz = true;
+   } else {
+      _mesa_warning(&intel->ctx,
+                    "env variable INTEL_HIZ=\"%s\" has invalid value and "
+                    "is ignored", s);
+   }
+}
+
+/**
+ * Override intel->has_separate_stencil with environment variable
+ * INTEL_SEPARATE_STENCIL.
+ *
+ * Valid values for INTEL_SEPARATE_STENCIL are "0" and "1". If an invalid
+ * value is encountered, a warning is emitted and INTEL_SEPARATE_STENCIL is
+ * ignored.
+ */
+static void
+intel_override_separate_stencil(struct intel_context *intel)
+{
+   const char *s = getenv("INTEL_SEPARATE_STENCIL");
+   if (!s) {
+      return;
+   } else if (!strncmp("0", s, 2)) {
+      intel->has_separate_stencil = false;
+   } else if (!strncmp("1", s, 2)) {
+      intel->has_separate_stencil = true;
+   } else {
+      _mesa_warning(&intel->ctx,
+                    "env variable INTEL_SEPARATE_STENCIL=\"%s\" has invalid "
+                    "value and is ignored", s);
+   }
+}
 
 GLboolean
 intelInitContext(struct intel_context *intel,
@@ -667,9 +714,14 @@ intelInitContext(struct intel_context *intel,
    if (IS_GEN7(intel->intelScreen->deviceID)) {
       intel->needs_ff_sync = GL_TRUE;
       intel->has_luminance_srgb = GL_TRUE;
+      /* FINISHME: Enable intel->has_separate_stencil on Gen7. */
+      /* FINISHME: Enable intel->must_use_separate_stencil on Gen7. */
+      /* FINISHME: Enable intel->has_hiz on Gen7. */
    } else if (IS_GEN6(intel->intelScreen->deviceID)) {
       intel->needs_ff_sync = GL_TRUE;
       intel->has_luminance_srgb = GL_TRUE;
+      /* FINISHME: Enable intel->has_separate_stencil on Gen6. */
+      /* FINISHME: Enable intel->has_hiz on Gen6. */
    } else if (IS_GEN5(intel->intelScreen->deviceID)) {
       intel->needs_ff_sync = GL_TRUE;
       intel->has_luminance_srgb = GL_TRUE;
@@ -689,6 +741,9 @@ intelInitContext(struct intel_context *intel,
       }
    }
 
+   intel_override_hiz(intel);
+   intel_override_separate_stencil(intel);
+
    memset(&ctx->TextureFormatSupported, 0,
 	  sizeof(ctx->TextureFormatSupported));
    ctx->TextureFormatSupported[MESA_FORMAT_ARGB8888] = GL_TRUE;
diff --git a/src/mesa/drivers/dri/intel/intel_context.h b/src/mesa/drivers/dri/intel/intel_context.h
index d3a8a659caa..007eaf9d616 100644
--- a/src/mesa/drivers/dri/intel/intel_context.h
+++ b/src/mesa/drivers/dri/intel/intel_context.h
@@ -166,6 +166,9 @@ struct intel_context
    GLboolean is_945;
    GLboolean has_luminance_srgb;
    GLboolean has_xrgb_textures;
+   GLboolean has_separate_stencil;
+   GLboolean must_use_separate_stencil;
+   GLboolean has_hiz;
 
    int urb_size;