Mesa (master): gen7 depth surface: calculate minimum array element being rendered

[Jordan Justen]

Module: Mesa
Branch: master
Commit: a23cfb86489af20ddc1f67395b1552560001f0d0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a23cfb86489af20ddc1f67395b1552560001f0d0

Author: Jordan Justen <jordan.l.justen at intel.com>
Date:   Tue Jul  9 15:24:56 2013 -0700

gen7 depth surface: calculate minimum array element being rendered

In layered rendering this will be 0. Otherwise it will be the
selected slice.

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Paul Berry <stereotype441 at gmail.com>

---

 src/mesa/drivers/dri/i965/gen7_blorp.cpp    |    7 +++++++
 src/mesa/drivers/dri/i965/gen7_misc_state.c |   10 ++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/gen7_blorp.cpp b/src/mesa/drivers/dri/i965/gen7_blorp.cpp
index 2ab7c57..9ce1a75 100644
--- a/src/mesa/drivers/dri/i965/gen7_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/gen7_blorp.cpp
@@ -665,6 +665,7 @@ gen7_blorp_emit_depth_stencil_config(struct brw_context *brw,
    uint8_t mocs = brw->is_haswell ? GEN7_MOCS_L3 : 0;
    uint32_t surftype;
    unsigned int depth = MAX2(params->depth.mt->logical_depth0, 1);
+   unsigned int min_array_element;
    GLenum gl_target = params->depth.mt->target;
    unsigned int lod;
 
@@ -689,6 +690,12 @@ gen7_blorp_emit_depth_stencil_config(struct brw_context *brw,
       break;
    }
 
+   min_array_element = params->depth.layer;
+   if (params->depth.mt->num_samples > 1) {
+      /* Convert physical layer to logical layer. */
+      min_array_element /= params->depth.mt->num_samples;
+   }
+
    lod = params->depth.level - params->depth.mt->first_level;
 
    /* 3DSTATE_DEPTH_BUFFER */
diff --git a/src/mesa/drivers/dri/i965/gen7_misc_state.c b/src/mesa/drivers/dri/i965/gen7_misc_state.c
index acbf79d..e9167b7 100644
--- a/src/mesa/drivers/dri/i965/gen7_misc_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_misc_state.c
@@ -45,6 +45,7 @@ gen7_emit_depth_stencil_hiz(struct brw_context *brw,
    struct gl_framebuffer *fb = ctx->DrawBuffer;
    uint32_t surftype;
    unsigned int depth = 1;
+   unsigned int min_array_element;
    GLenum gl_target = GL_TEXTURE_2D;
    unsigned int lod;
    const struct intel_renderbuffer *irb = NULL;
@@ -79,6 +80,15 @@ gen7_emit_depth_stencil_hiz(struct brw_context *brw,
       break;
    }
 
+   if (fb->Layered || !irb) {
+      min_array_element = 0;
+   } else if (irb->mt->num_samples > 1) {
+      /* Convert physical layer to logical layer. */
+      min_array_element = irb->mt_layer / irb->mt->num_samples;
+   } else {
+      min_array_element = irb->mt_layer;
+   }
+
    lod = irb ? irb->mt_level - irb->mt->first_level : 0;
 
    /* _NEW_DEPTH, _NEW_STENCIL, _NEW_BUFFERS */