From 507e71e45a2e46c6e01423ab00948a72f435396c Mon Sep 17 00:00:00 2001
From: Eric Anholt <eric@anholt.net>
Date: Thu, 17 Nov 2011 17:19:12 -0800
Subject: [PATCH] i965: Add support for GL_ARB_depth_buffer_float under 3.0
 override.

This is not exposed generally yet because some of the swrast paths hit
in piglit (drawpixels, copypixels, blit) aren't yet converted to
MapRenderbuffer.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_misc_state.c       |  5 ++++-
 src/mesa/drivers/dri/i965/brw_wm_surface_state.c | 10 ++++++++++
 src/mesa/drivers/dri/intel/intel_extensions.c    |  2 ++
 src/mesa/drivers/dri/intel/intel_tex_format.c    |  4 ++++
 4 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/brw_misc_state.c b/src/mesa/drivers/dri/i965/brw_misc_state.c
index ad49c8fe688..e76901a3136 100644
--- a/src/mesa/drivers/dri/i965/brw_misc_state.c
+++ b/src/mesa/drivers/dri/i965/brw_misc_state.c
@@ -209,7 +209,8 @@ brw_depthbuffer_format(struct brw_context *brw)
    if (!drb &&
        (srb = intel_get_renderbuffer(fb, BUFFER_STENCIL)) &&
        !srb->mt->stencil_mt &&
-       srb->Base.Format == MESA_FORMAT_S8_Z24) {
+       (srb->Base.Format == MESA_FORMAT_S8_Z24 ||
+	srb->Base.Format == MESA_FORMAT_Z32_FLOAT_X24S8)) {
       drb = srb;
    }
 
@@ -225,6 +226,8 @@ brw_depthbuffer_format(struct brw_context *brw)
       return BRW_DEPTHFORMAT_D24_UNORM_X8_UINT;
    case MESA_FORMAT_S8_Z24:
       return BRW_DEPTHFORMAT_D24_UNORM_S8_UINT;
+   case MESA_FORMAT_Z32_FLOAT_X24S8:
+      return BRW_DEPTHFORMAT_D32_FLOAT_S8X24_UINT;
    default:
       _mesa_problem(ctx, "Unexpected depth format %s\n",
 		    _mesa_get_format_name(drb->Base.Format));
diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index d36b6f871b1..7a959522a09 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -541,12 +541,16 @@ brw_init_surface_formats(struct brw_context *brw)
    brw->format_supported_as_render_target[MESA_FORMAT_X8_Z24] = true;
    brw->format_supported_as_render_target[MESA_FORMAT_S8] = true;
    brw->format_supported_as_render_target[MESA_FORMAT_Z16] = true;
+   brw->format_supported_as_render_target[MESA_FORMAT_Z32_FLOAT] = true;
+   brw->format_supported_as_render_target[MESA_FORMAT_Z32_FLOAT_X24S8] = true;
 
    /* We remap depth formats to a supported texturing format in
     * translate_tex_format().
     */
    ctx->TextureFormatSupported[MESA_FORMAT_S8_Z24] = true;
    ctx->TextureFormatSupported[MESA_FORMAT_X8_Z24] = true;
+   ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT] = true;
+   ctx->TextureFormatSupported[MESA_FORMAT_Z32_FLOAT_X24S8] = true;
 }
 
 bool
@@ -574,6 +578,12 @@ translate_tex_format(gl_format mesa_format,
    case MESA_FORMAT_X8_Z24:
       return BRW_SURFACEFORMAT_I24X8_UNORM;
 
+   case MESA_FORMAT_Z32_FLOAT:
+      return BRW_SURFACEFORMAT_I32_FLOAT;
+
+   case MESA_FORMAT_Z32_FLOAT_X24S8:
+      return BRW_SURFACEFORMAT_R32G32_FLOAT;
+
    case MESA_FORMAT_SARGB8:
    case MESA_FORMAT_SLA8:
    case MESA_FORMAT_SL8:
diff --git a/src/mesa/drivers/dri/intel/intel_extensions.c b/src/mesa/drivers/dri/intel/intel_extensions.c
index 681f5f25496..2e2a31f89eb 100644
--- a/src/mesa/drivers/dri/intel/intel_extensions.c
+++ b/src/mesa/drivers/dri/intel/intel_extensions.c
@@ -109,6 +109,8 @@ intelInitExtensions(struct gl_context *ctx)
 
    if (intel->gen >= 4) {
       ctx->Extensions.ARB_color_buffer_float = true;
+      if (override_version >= 30)
+	 ctx->Extensions.ARB_depth_buffer_float = true;
       ctx->Extensions.ARB_depth_clamp = true;
       ctx->Extensions.ARB_fragment_coord_conventions = true;
       ctx->Extensions.ARB_fragment_program_shadow = true;
diff --git a/src/mesa/drivers/dri/intel/intel_tex_format.c b/src/mesa/drivers/dri/intel/intel_tex_format.c
index 898846fd233..f53054d55d3 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_format.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_format.c
@@ -41,6 +41,10 @@ intel_mesa_format_to_rb_datatype(gl_format format)
    case MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32:
       return GL_FLOAT;
 
+      /* The core depthstencil wrappers demand this. */
+   case MESA_FORMAT_Z32_FLOAT_X24S8:
+      return GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
+
    default:
       /* Unsupported format.  We may hit this when people ask for FBO-incomplete
        * formats.