From 55cd3ab8e7abeb2d28051c08e71e69931b4e5598 Mon Sep 17 00:00:00 2001
From: Ilia Mirkin <imirkin@alum.mit.edu>
Date: Fri, 23 Oct 2015 02:14:31 -0400
Subject: nvc0: respect edgeflag attribute width

The edgeflag comes in as ubyte with glEdgeFlagPointer but as float with
plain immediate glEdgeFlag. Avoid reading bytes that weren't meant for
the edgeflag in the pointer case.

Fixes intermittent failures with gl-2.0-edgeflag piglit (and valgrind
complaints about reading uninitialized memory).

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit e05021ff72abb7de6506c90dd70a9f7ab490bf90)
---
 .../drivers/nouveau/nvc0/nvc0_vbo_translate.c      | 40 ++++++++++++++++++----
 1 file changed, 33 insertions(+), 7 deletions(-)

(limited to 'src/gallium/drivers')

diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_vbo_translate.c b/src/gallium/drivers/nouveau/nvc0/nvc0_vbo_translate.c
index 8b23a4887da..9c19ba20a7e 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_vbo_translate.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_vbo_translate.c
@@ -27,6 +27,7 @@ struct push_context {
    struct {
       bool enabled;
       bool value;
+      uint8_t width;
       unsigned stride;
       const uint8_t *data;
    } edgeflag;
@@ -53,6 +54,7 @@ nvc0_push_context_init(struct nvc0_context *nvc0, struct push_context *ctx)
    /* silence warnings */
    ctx->edgeflag.data = NULL;
    ctx->edgeflag.stride = 0;
+   ctx->edgeflag.width = 0;
 }
 
 static inline void
@@ -100,6 +102,7 @@ nvc0_push_map_edgeflag(struct push_context *ctx, struct nvc0_context *nvc0,
    struct nv04_resource *buf = nv04_resource(vb->buffer);
 
    ctx->edgeflag.stride = vb->stride;
+   ctx->edgeflag.width = util_format_get_blocksize(ve->src_format);
    if (buf) {
       unsigned offset = vb->buffer_offset + ve->src_offset;
       ctx->edgeflag.data = nouveau_resource_map_offset(&nvc0->base,
@@ -137,10 +140,17 @@ prim_restart_search_i32(const uint32_t *elts, unsigned push, uint32_t index)
 }
 
 static inline bool
-ef_value(const struct push_context *ctx, uint32_t index)
+ef_value_8(const struct push_context *ctx, uint32_t index)
 {
-   float *pf = (float *)&ctx->edgeflag.data[index * ctx->edgeflag.stride];
-   return *pf ? true : false;
+   uint8_t *pf = (uint8_t *)&ctx->edgeflag.data[index * ctx->edgeflag.stride];
+   return !!*pf;
+}
+
+static inline bool
+ef_value_32(const struct push_context *ctx, uint32_t index)
+{
+   uint32_t *pf = (uint32_t *)&ctx->edgeflag.data[index * ctx->edgeflag.stride];
+   return !!*pf;
 }
 
 static inline bool
@@ -154,7 +164,11 @@ static inline unsigned
 ef_toggle_search_i08(struct push_context *ctx, const uint8_t *elts, unsigned n)
 {
    unsigned i;
-   for (i = 0; i < n && ef_value(ctx, elts[i]) == ctx->edgeflag.value; ++i);
+   bool ef = ctx->edgeflag.value;
+   if (ctx->edgeflag.width == 1)
+      for (i = 0; i < n && ef_value_8(ctx, elts[i]) == ef; ++i);
+   else
+      for (i = 0; i < n && ef_value_32(ctx, elts[i]) == ef; ++i);
    return i;
 }
 
@@ -162,7 +176,11 @@ static inline unsigned
 ef_toggle_search_i16(struct push_context *ctx, const uint16_t *elts, unsigned n)
 {
    unsigned i;
-   for (i = 0; i < n && ef_value(ctx, elts[i]) == ctx->edgeflag.value; ++i);
+   bool ef = ctx->edgeflag.value;
+   if (ctx->edgeflag.width == 1)
+      for (i = 0; i < n && ef_value_8(ctx, elts[i]) == ef; ++i);
+   else
+      for (i = 0; i < n && ef_value_32(ctx, elts[i]) == ef; ++i);
    return i;
 }
 
@@ -170,7 +188,11 @@ static inline unsigned
 ef_toggle_search_i32(struct push_context *ctx, const uint32_t *elts, unsigned n)
 {
    unsigned i;
-   for (i = 0; i < n && ef_value(ctx, elts[i]) == ctx->edgeflag.value; ++i);
+   bool ef = ctx->edgeflag.value;
+   if (ctx->edgeflag.width == 1)
+      for (i = 0; i < n && ef_value_8(ctx, elts[i]) == ef; ++i);
+   else
+      for (i = 0; i < n && ef_value_32(ctx, elts[i]) == ef; ++i);
    return i;
 }
 
@@ -178,7 +200,11 @@ static inline unsigned
 ef_toggle_search_seq(struct push_context *ctx, unsigned start, unsigned n)
 {
    unsigned i;
-   for (i = 0; i < n && ef_value(ctx, start++) == ctx->edgeflag.value; ++i);
+   bool ef = ctx->edgeflag.value;
+   if (ctx->edgeflag.width == 1)
+      for (i = 0; i < n && ef_value_8(ctx, start++) == ef; ++i);
+   else
+      for (i = 0; i < n && ef_value_32(ctx, start++) == ef; ++i);
    return i;
 }
 
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