mesa: add/update comments in _mesa_copy_buffer_subdata()

[mesa.git] / src / mesa / drivers / dri / i965 / brw_context.c

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index 5e9cb1f8b2fe208a9d8cdc18a4ba844288b2163b..48c141c9c2e7a3d681b087aa5e3aeeb344148eab 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -109,7 +109,8 @@ static void brwPrepareExecBegin(struct gl_context *ctx)
    }
 }
 
-static void brwInitDriverFunctions( struct dd_function_table *functions )
+static void brwInitDriverFunctions(struct intel_screen *screen,
+                                  struct dd_function_table *functions)
 {
    intelInitDriverFunctions( functions );
 
@@ -117,6 +118,12 @@ static void brwInitDriverFunctions( struct dd_function_table *functions )
    brw_init_queryobj_functions(functions);
 
    functions->PrepareExecBegin = brwPrepareExecBegin;
+   functions->BeginTransformFeedback = brw_begin_transform_feedback;
+
+   if (screen->gen >= 7)
+      functions->EndTransformFeedback = gen7_end_transform_feedback;
+   else
+      functions->EndTransformFeedback = brw_end_transform_feedback;
 }
 
 bool
@@ -125,6 +132,8 @@ brwCreateContext(int api,
                 __DRIcontext *driContextPriv,
                 void *sharedContextPrivate)
 {
+   __DRIscreen *sPriv = driContextPriv->driScreenPriv;
+   struct intel_screen *screen = sPriv->driverPrivate;
    struct dd_function_table functions;
    struct brw_context *brw = rzalloc(NULL, struct brw_context);
    struct intel_context *intel = &brw->intel;
@@ -136,7 +145,7 @@ brwCreateContext(int api,
       return false;
    }
 
-   brwInitDriverFunctions( &functions );
+   brwInitDriverFunctions(screen, &functions);
 
    if (!intelInitContext( intel, api, mesaVis, driContextPriv,
                          sharedContextPrivate, &functions )) {
@@ -178,6 +187,26 @@ brwCreateContext(int api,
    
    ctx->Const.MaxTextureMaxAnisotropy = 16.0;
 
+   /* Hardware only supports a limited number of transform feedback buffers.
+    * So we need to override the Mesa default (which is based only on software
+    * limits).
+    */
+   ctx->Const.MaxTransformFeedbackSeparateAttribs = BRW_MAX_SOL_BUFFERS;
+
+   /* On Gen6, in the worst case, we use up one binding table entry per
+    * transform feedback component (see comments above the definition of
+    * BRW_MAX_SOL_BINDINGS, in brw_context.h), so we need to advertise a value
+    * for MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS equal to
+    * BRW_MAX_SOL_BINDINGS.
+    *
+    * In "separate components" mode, we need to divide this value by
+    * BRW_MAX_SOL_BUFFERS, so that the total number of binding table entries
+    * used up by all buffers will not exceed BRW_MAX_SOL_BINDINGS.
+    */
+   ctx->Const.MaxTransformFeedbackInterleavedComponents = BRW_MAX_SOL_BINDINGS;
+   ctx->Const.MaxTransformFeedbackSeparateComponents =
+      BRW_MAX_SOL_BINDINGS / BRW_MAX_SOL_BUFFERS;
+
    /* if conformance mode is set, swrast can handle any size AA point */
    ctx->Const.MaxPointSizeAA = 255.0;