[Mesa-dev] [RFC PATCH 06/12] gen7 depth surface: calculate minimum array element being rendered

[Jordan Justen]

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>
---
 src/mesa/drivers/dri/i965/gen7_blorp.cpp    |    6 ++++++
 src/mesa/drivers/dri/i965/gen7_misc_state.c |    9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/gen7_blorp.cpp b/src/mesa/drivers/dri/i965/gen7_blorp.cpp
index 7df78f6..3d1710e 100644
--- a/src/mesa/drivers/dri/i965/gen7_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/gen7_blorp.cpp
@@ -659,6 +659,7 @@ gen7_blorp_emit_depth_stencil_config(struct brw_context *brw,
    uint32_t tile_mask_x, tile_mask_y;
    uint32_t surftype;
    int depth = MAX2(params->depth.mt->logical_depth0, 1);
+   int min_array_element;
    GLenum gl_target = params->depth.mt->target;
    int lod;
 
@@ -678,6 +679,11 @@ gen7_blorp_emit_depth_stencil_config(struct brw_context *brw,
       break;
    }
 
+   min_array_element = params->depth.layer;
+   if (params->depth.mt->num_samples > 1) {
+      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 404d7d2..87fbfaa 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;
    int depth = 1;
+   int min_array_element;
    GLenum gl_target = GL_TEXTURE_2D;
    int lod;
    bool layered = false;
@@ -84,6 +85,14 @@ gen7_emit_depth_stencil_hiz(struct brw_context *brw,
       break;
    }
 
+   if (layered || !irb) {
+      min_array_element = 0;
+   } else if (irb->mt->num_samples > 1) {
+      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 */
-- 
1.7.10.4