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i830: Compute initial number of vertices from remaining batch space

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In order to prevent an overflow of the batch buffer when emitting
triangles, we need to limit the initial primitive to fit within the
current batch. To do we need to measure the remaining space and thence
compute the maximum number of vertices that fit into that space.

Reported-by: Kurt Roeckx <kurt@roeckx.be>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=41495
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Eric Anholt <eric@anholt.net>
NOTE: This is a candidate for release branches.
This commit is contained in:
Chris Wilson 2011-11-09 22:21:16 +00:00 • committed by Eric Anholt
parent 7d13a6e64b
commit 33b07893e9
1 changed files with 11 additions and 5 deletions
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16
src/mesa/drivers/dri/i915/intel_render.c
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@ -119,12 +119,14 @@ intelDmaPrimitive(struct intel_context *intel, GLenum prim)
intel_set_prim(intel, hw_prim[prim]);
}
#define INTEL_NO_VBO_STATE_RESERVED 1500
static INLINE GLuint intel_get_vb_max(struct intel_context *intel)
{
GLuint ret;
if (intel->intelScreen->no_vbo)
ret = sizeof(intel->batch.map) - 1500;
ret = sizeof(intel->batch.map) - INTEL_NO_VBO_STATE_RESERVED;
else
ret = INTEL_VB_SIZE;
ret /= (intel->vertex_size * 4);
@ -133,11 +135,15 @@ static INLINE GLuint intel_get_vb_max(struct intel_context *intel)
static INLINE GLuint intel_get_current_max(struct intel_context *intel)
{
GLuint ret;
if (intel->intelScreen->no_vbo)
return intel_get_vb_max(intel);
else
return (INTEL_VB_SIZE - intel->prim.current_offset) / (intel->vertex_size * 4);
if (intel->intelScreen->no_vbo) {
ret = intel_batchbuffer_space(intel);
ret = ret <= INTEL_NO_VBO_STATE_RESERVED ? 0 : ret - INTEL_NO_VBO_STATE_RESERVED;
} else
ret = (INTEL_VB_SIZE - intel->prim.current_offset);
return ret / (intel->vertex_size * 4);
}
#define LOCAL_VARS struct intel_context *intel = intel_context(ctx)