[Mesa-dev] [PATCH 10/11] freedreno: a2xx: split large draws on a20x

[Jonathan Marek]

a20x can only draw 65535 vertices at once. this fix only applies to
triangles.

Signed-off-by: Jonathan Marek <jonat...@marek.ca>
---
 src/gallium/drivers/freedreno/a2xx/fd2_draw.c | 30 +++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/freedreno/a2xx/fd2_draw.c 
b/src/gallium/drivers/freedreno/a2xx/fd2_draw.c
index 1792505808..7ccbee587f 100644
--- a/src/gallium/drivers/freedreno/a2xx/fd2_draw.c
+++ b/src/gallium/drivers/freedreno/a2xx/fd2_draw.c
@@ -171,8 +171,34 @@ fd2_draw_vbo(struct fd_context *ctx, const struct 
pipe_draw_info *pinfo,
        fd2_emit_state(ctx, ctx->batch->draw, ctx->dirty);
        fd2_emit_state(ctx, ctx->batch->binning, ctx->dirty);
 
-       draw_impl(ctx, pinfo, ctx->batch->draw, index_offset, false);
-       draw_impl(ctx, pinfo, ctx->batch->binning, index_offset, true);
+       /* a20x can only draw 65535 vertices at once... */
+       if (is_a20x(ctx->screen) && pinfo->count > 0xffff) {
+               struct pipe_draw_info info = *pinfo;
+               unsigned count = info.count;
+               unsigned num_vertices = ctx->batch->num_vertices;
+
+               /* other primitives require more work
+                * (triangles works because 0xffff is divible by 3)
+                */
+               if (info.mode != PIPE_PRIM_TRIANGLES)
+                       return false;
+
+               for (; count; ) {
+                       info.count = MIN2(count, 0xffff);
+
+                       draw_impl(ctx, &info, ctx->batch->draw, index_offset, 
false);
+                       draw_impl(ctx, &info, ctx->batch->binning, 
index_offset, true);
+
+                       info.start += 0xffff;
+                       ctx->batch->num_vertices += 0xffff;
+                       count -= info.count;
+               }
+               /* changing this value is a hack, restore it */
+               ctx->batch->num_vertices = num_vertices;
+       } else {
+               draw_impl(ctx, pinfo, ctx->batch->draw, index_offset, false);
+               draw_impl(ctx, pinfo, ctx->batch->binning, index_offset, true);
+       }
 
        fd_context_all_clean(ctx);
 
-- 
2.17.1

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