intel: Add flags to intel_screen for hiz and separate stencil

Add the fields below to intel_screen. The expression in parens is the
value to which intelInitScreen2() currently sets the field.
    GLboolean hw_has_separate_stencil      (true iff gen >= 7)
    GLboolean hw_must_use_separate_stencil (true iff gen >= 7)
    GLboolean hw_has_hiz                   (always false)
    enum intel_dri2_has_hiz dri2_has_hiz   (INTEL_DRI2_HAS_HIZ_UNKNOWN)

The analogous fields in intel_context now inherit their values from
intel_screen.

When hiz and separate stencil become completely implemented for a given
chipset, then the respective fields need to be enabled.

CC: Ian Romanick <idr@freedesktop.org>
CC: Kristian Høgsberg <krh@bitplanet.net>
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chad Versace <chad@chad-versace.us>

3 files changed, 73 insertions, 7 deletions

diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
index b6a017a876c..22704a30e1c 100644
--- a/src/mesa/drivers/dri/intel/intel_context.c
+++ b/src/mesa/drivers/dri/intel/intel_context.c
@@ -704,14 +704,9 @@ 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;
@@ -731,8 +726,9 @@ intelInitContext(struct intel_context *intel,
       }
    }
 
-   intel_override_hiz(intel);
-   intel_override_separate_stencil(intel);
+   intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
+   intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
+   intel->has_hiz = intel->intelScreen->hw_has_hiz;
 
    memset(&ctx->TextureFormatSupported, 0,
 	  sizeof(ctx->TextureFormatSupported));
diff --git a/src/mesa/drivers/dri/intel/intel_screen.c b/src/mesa/drivers/dri/intel/intel_screen.c
index deca11d8c34..646b96051d9 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.c
+++ b/src/mesa/drivers/dri/intel/intel_screen.c
@@ -507,6 +507,54 @@ intel_init_bufmgr(struct intel_screen *intelScreen)
 }
 
 /**
+ * Override intel_screen.hw_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_screen *intel)
+{
+   const char *s = getenv("INTEL_HIZ");
+   if (!s) {
+      return;
+   } else if (!strncmp("0", s, 2)) {
+      intel->hw_has_hiz = false;
+   } else if (!strncmp("1", s, 2)) {
+      intel->hw_has_hiz = true;
+   } else {
+      fprintf(stderr,
+	      "warning: env variable INTEL_HIZ=\"%s\" has invalid value "
+	      "and is ignored", s);
+   }
+}
+
+/**
+ * Override intel_screen.hw_has_separate_stencil with environment variable
+ * INTEL_SEPARATE_STENCIL.
+ *
+ * Valid values for INTEL_SEPARATE_STENCIL are "0" and "1". If an invalid
+ * valid value is encountered, a warning is emitted and INTEL_SEPARATE_STENCIL
+ * is ignored.
+ */
+static void
+intel_override_separate_stencil(struct intel_screen *screen)
+{
+   const char *s = getenv("INTEL_SEPARATE_STENCIL");
+   if (!s) {
+      return;
+   } else if (!strncmp("0", s, 2)) {
+      screen->hw_has_separate_stencil = false;
+   } else if (!strncmp("1", s, 2)) {
+      screen->hw_has_separate_stencil = true;
+   } else {
+      fprintf(stderr,
+	      "warning: env variable INTEL_SEPARATE_STENCIL=\"%s\" has "
+	      "invalid value and is ignored", s);
+   }
+}
+
+/**
  * This is the driver specific part of the createNewScreen entry point.
  * Called when using DRI2.
  *
@@ -570,6 +618,18 @@ __DRIconfig **intelInitScreen2(__DRIscreen *psp)
       intelScreen->gen = 2;
    }
 
+   /*
+    * FIXME: The hiz and separate stencil fields need updating once the
+    * FIXME: features are completely implemented for a given chipset.
+    */
+   intelScreen->hw_has_separate_stencil = intelScreen->gen >= 7;
+   intelScreen->hw_must_use_separate_stencil = intelScreen->gen >= 7;
+   intelScreen->hw_has_hiz = false;
+   intelScreen->dri2_has_hiz = INTEL_DRI2_HAS_HIZ_UNKNOWN;
+
+   intel_override_hiz(intelScreen);
+   intel_override_separate_stencil(intelScreen);
+
    api_mask = (1 << __DRI_API_OPENGL);
 #if FEATURE_ES1
    api_mask |= (1 << __DRI_API_GLES);
diff --git a/src/mesa/drivers/dri/intel/intel_screen.h b/src/mesa/drivers/dri/intel/intel_screen.h
index 5d13dfba612..b4afae9d62f 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.h
+++ b/src/mesa/drivers/dri/intel/intel_screen.h
@@ -102,6 +102,16 @@ struct intel_screen
    GLboolean no_hw;
    GLuint relaxed_relocations;
 
+   /*
+    * The hardware hiz and separate stencil fields are needed in intel_screen,
+    * rather than solely in intel_context, because glXCreatePbuffer and
+    * glXCreatePixmap are not passed a GLXContext.
+    */
+   GLboolean hw_has_separate_stencil;
+   GLboolean hw_must_use_separate_stencil;
+   GLboolean hw_has_hiz;
+   enum intel_dri2_has_hiz dri2_has_hiz;
+
    GLboolean no_vbo;
    dri_bufmgr *bufmgr;
    struct _mesa_HashTable *named_regions;