This only checks power of 2 sample counts for now, but maybe we would
like to probe the values in between too ...
nv50 for example can store 12 "coverage samples" in a depth surface, but
they have to be used in a hardware specific way together with
multisampled colour surfaces (which are always power of 2) which can
presently not be done through the gallium interface.
>From b35a1ce7248237ac0cf4209eb8703d13c380ff5a Mon Sep 17 00:00:00 2001
From: Christoph Bumiller <e0425...@student.tuwien.ac.at>
Date: Sat, 23 Jul 2011 00:55:20 +0200
Subject: [PATCH 3/6] st/mesa: determine Const.MaxSamples in init_extensions
---
src/mesa/state_tracker/st_extensions.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/src/mesa/state_tracker/st_extensions.c
b/src/mesa/state_tracker/st_extensions.c
index 99b231d..391ff1b 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -219,6 +219,7 @@ void st_init_extensions(struct st_context *st)
{
struct pipe_screen *screen = st->pipe->screen;
struct gl_context *ctx = st->ctx;
+ int i;
/*
* Extensions that are supported by all Gallium drivers:
@@ -596,6 +597,14 @@ void st_init_extensions(struct st_context *st)
ctx->Extensions.EXT_packed_float = GL_TRUE;
}
+ /* Maximum sample count. */
+ for (i = 1; i <= 16; i <<= 1)
+ if (!screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
+ PIPE_TEXTURE_2D, i << 1,
+ PIPE_BIND_RENDER_TARGET))
+ break;
+ ctx->Const.MaxSamples = i;
+
if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
--
1.7.2.2
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