Changes in v4:
- Use a single flag for state tracker -> driver like in v1, but with
a better name and separated from the other flags
- Fully clarify semantics of that flag
Changes in v3:
- Rework to use multiple flags
Changes in v2:
- Add a much longer and better comment
This allows:
1. The state tracker to tell the driver which normalizations it needs
2. The driver to tell the state tracker which normalization it prefers
---
src/gallium/include/pipe/p_defines.h | 55 ++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/src/gallium/include/pipe/p_defines.h
b/src/gallium/include/pipe/p_defines.h
index 00aa207..9625d52 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -313,6 +313,61 @@ enum pipe_transfer_usage {
/* Flags for the driver about resource behaviour:
*/
#define PIPE_RESOURCE_FLAG_GEN_MIPS (1 << 0) /* Driver performs autogen
mips */
+
+/*
+ * PIPE_CAP_FLEXIBLE_SAMPLING is a fictitious cap that doesn't currently
+ * exist, but will be supported by OpenCL-capable cards.
+ *
+ * If PIPE_CAP_FLEXIBLE_SAMPLING is supported:
+ * - PIPE_RESOURCE_FLAG_TEXTURE_RECT_SEMANTICS is ignored
+ * - if PIPE_RESOURCE_FLAG_PREFER_UNNORMALIZED_COORDS is set by the driver,
+ * should use unnormalized coordinates, but can use normalized too
+ * - If PIPE_RESOURCE_FLAG_PREFER_NORMALIZED_COORDS is set by the driver,
+ * should use normalized coordinates, but can use unnormalized too
+ * - Otherwise, can use any normalization indifferently
+
+ * If PIPE_CAP_FLEXIBLE_SAMPLING is not set
+ * and PIPE_RESOURCE_FLAG_TEXTURE_RECT_SEMANTICS is set:
+ * - last_level must be 0
+ * - Must use a clamp wrap mode
+ * - if PIPE_RESOURCE_FLAG_PREFER_NORMALIZED_COORDS is set by the driver,.
+ * should use normalized coordinates, but can use unnormalized too
+ * - if PIPE_RESOURCE_FLAG_PREFER_UNNORMALIZED_COORDS is set by the driver
+ * must use unnormalized coordinates
+ * - Otherwise, can use any normalization indifferently
+
+ * If PIPE_CAP_FLEXIBLE_SAMPLING is not set
+ * and PIPE_RESOURCE_FLAG_TEXTURE_RECT_SEMANTICS is not set:
+ * - If NPOT and PIPE_CAP_NPOT_TEXTURES is not supported,
+ * last_level must be 0
+ * - If using unnormalized coordinates or
+ * if NPOT and PIPE_CAP_NPOT_TEXTURES is not supported
+ * Must use a clamp wrap mode
+ * - if PIPE_RESOURCE_FLAG_PREFER_NORMALIZED_COORDS is set by the driver,.
+ * must use normalized coordinates
+ * - if PIPE_RESOURCE_FLAG_PREFER_UNNORMALIZED_COORDS is set by the driver
+ * and NPOT and PIPE_CAP_NPOT_TEXTURES is not supported,
+ * must use unnormalized coordinates
+ - if PIPE_RESOURCE_FLAG_PREFER_UNNORMALIZED_COORDS is set by the driver
+ * and POT or PIPE_CAP_NPOT_TEXTURES is supported,
+ * should use unnormalized coordinates, but can use normalized too
+ * - Otherwise, can use any normalization indifferently
+ */
+#define PIPE_RESOURCE_FLAG_TEXTURE_RECT_SEMANTICS (1 << 1)
+
+/* State trackers must not set these flags.
+ *
+ * Drivers should set these flags to inform the state tracker of the
normalization
+ * it should use in internal drawing code, if they prefer any.
+ *
+ * Drivers who need to always have the same normalization used for a given
+ * resource must set either flag depending on whether
+ * PIPE_RESOURCE_FLAG_TEXTURE_RECT_SEMANTICS has been specified by the
+ * driver
+ */
+#define PIPE_RESOURCE_FLAG_PREFER_UNNORMALIZED_COORDS (1 << 2)
+#define PIPE_RESOURCE_FLAG_PREFER_NORMALIZED_COORDS (1 << 3)
+
#define PIPE_RESOURCE_FLAG_DRV_PRIV (1 << 16) /* driver/winsys private */
#define PIPE_RESOURCE_FLAG_ST_PRIV (1 << 24) /* state-tracker/winsys
private */
--
1.7.0.4
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