This is required for any serious constant buffer support.
Constant buffer offsets on ATI and NVIDIA DX10 and DX11 GPUs must be
a multiple of 256.
In OpenGL, this can be queried via GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT.
---
src/gallium/docs/source/screen.rst | 2 ++
src/gallium/drivers/i915/i915_screen.c | 3 +++
src/gallium/drivers/llvmpipe/lp_screen.c | 2 ++
src/gallium/drivers/nv30/nv30_screen.c | 2 ++
src/gallium/drivers/nv50/nv50_screen.c | 2 ++
src/gallium/drivers/nvc0/nvc0_screen.c | 2 ++
src/gallium/drivers/r300/r300_screen.c | 3 +++
src/gallium/drivers/r600/r600_pipe.c | 3 +++
src/gallium/drivers/radeonsi/radeonsi_pipe.c | 3 +++
src/gallium/drivers/softpipe/sp_screen.c | 2 ++
src/gallium/drivers/svga/svga_screen.c | 2 ++
src/gallium/include/pipe/p_defines.h | 3 ++-
12 files changed, 28 insertions(+), 1 deletions(-)
diff --git a/src/gallium/docs/source/screen.rst
b/src/gallium/docs/source/screen.rst
index b73c4d2..f6c6f3f 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -116,6 +116,8 @@ The integer capabilities:
* ``PIPE_CAP_USER_CONSTANT_BUFFERS``: Whether user constant buffers are
supported. If not, the state tracker must upload constants which are not in
hw
resources.
+* ``PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT``: Describes the required
+ alignment of pipe_constant_buffer::buffer_offset.
diff --git a/src/gallium/drivers/i915/i915_screen.c
b/src/gallium/drivers/i915/i915_screen.c
index 1b3c4be..0046860 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -208,6 +208,9 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap
cap)
case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
return 0;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 16;
+
/* Features we can lie about (boolean caps). */
case PIPE_CAP_OCCLUSION_QUERY:
return is->debug.lie ? 1 : 0;
diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c
b/src/gallium/drivers/llvmpipe/lp_screen.c
index 1a3e2bd..40037a5 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -163,6 +163,8 @@ llvmpipe_get_param(struct pipe_screen *screen, enum
pipe_cap param)
case PIPE_CAP_USER_INDEX_BUFFERS:
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 16;
default:
return 0;
}
diff --git a/src/gallium/drivers/nv30/nv30_screen.c
b/src/gallium/drivers/nv30/nv30_screen.c
index 74d425a..32cbc55 100644
--- a/src/gallium/drivers/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nv30/nv30_screen.c
@@ -82,6 +82,8 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum
pipe_cap param)
case PIPE_CAP_USER_INDEX_BUFFERS:
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 16;
/* nv4x capabilities */
case PIPE_CAP_BLEND_EQUATION_SEPARATE:
case PIPE_CAP_NPOT_TEXTURES:
diff --git a/src/gallium/drivers/nv50/nv50_screen.c
b/src/gallium/drivers/nv50/nv50_screen.c
index ad40cb4..20a135b 100644
--- a/src/gallium/drivers/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nv50/nv50_screen.c
@@ -154,6 +154,8 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum
pipe_cap param)
case PIPE_CAP_USER_INDEX_BUFFERS:
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 256;
case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
diff --git a/src/gallium/drivers/nvc0/nvc0_screen.c
b/src/gallium/drivers/nvc0/nvc0_screen.c
index 7e6c1d4..366e6fb 100644
--- a/src/gallium/drivers/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nvc0/nvc0_screen.c
@@ -144,6 +144,8 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum
pipe_cap param)
case PIPE_CAP_USER_INDEX_BUFFERS:
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 256;
case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
diff --git a/src/gallium/drivers/r300/r300_screen.c
b/src/gallium/drivers/r300/r300_screen.c
index ff9d395..f84f3e5 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -110,6 +110,9 @@ static int r300_get_param(struct pipe_screen* pscreen, enum
pipe_cap param)
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 16;
+
case PIPE_CAP_GLSL_FEATURE_LEVEL:
return 120;
diff --git a/src/gallium/drivers/r600/r600_pipe.c
b/src/gallium/drivers/r600/r600_pipe.c
index c0219b2..a9e5466 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -407,6 +407,9 @@ static int r600_get_param(struct pipe_screen* pscreen, enum
pipe_cap param)
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 256;
+
case PIPE_CAP_GLSL_FEATURE_LEVEL:
return rscreen->glsl_feature_level;
diff --git a/src/gallium/drivers/radeonsi/radeonsi_pipe.c
b/src/gallium/drivers/radeonsi/radeonsi_pipe.c
index cd78ed8..7ecbf7c 100644
--- a/src/gallium/drivers/radeonsi/radeonsi_pipe.c
+++ b/src/gallium/drivers/radeonsi/radeonsi_pipe.c
@@ -349,6 +349,9 @@ static int r600_get_param(struct pipe_screen* pscreen, enum
pipe_cap param)
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 256;
+
case PIPE_CAP_GLSL_FEATURE_LEVEL:
return debug_get_bool_option("R600_GLSL130", FALSE) ? 130 : 120;
diff --git a/src/gallium/drivers/softpipe/sp_screen.c
b/src/gallium/drivers/softpipe/sp_screen.c
index ec8aceb..cdc7867 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -142,6 +142,8 @@ softpipe_get_param(struct pipe_screen *screen, enum
pipe_cap param)
case PIPE_CAP_USER_INDEX_BUFFERS:
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 16;
default:
return 0;
}
diff --git a/src/gallium/drivers/svga/svga_screen.c
b/src/gallium/drivers/svga/svga_screen.c
index e6933a9..51c8583 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -164,6 +164,8 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap
param)
case PIPE_CAP_USER_INDEX_BUFFERS:
case PIPE_CAP_USER_CONSTANT_BUFFERS:
return 1;
+ case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
+ return 16;
case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
{
diff --git a/src/gallium/include/pipe/p_defines.h
b/src/gallium/include/pipe/p_defines.h
index 4d75dec..398cb98 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -478,7 +478,8 @@ enum pipe_cap {
PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY = 66,
PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY = 67,
PIPE_CAP_USER_INDEX_BUFFERS = 68,
- PIPE_CAP_USER_CONSTANT_BUFFERS = 69
+ PIPE_CAP_USER_CONSTANT_BUFFERS = 69,
+ PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT = 70
};
/**
--
1.7.5.4
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