r300g: revisit some assertions and fix potential failures

* Turn some assertions to error messages.
* At most 16 vertex elements can be set, others are ignored.
* Rasterize at most 8 vertex-shader generic outputs, others are ignored.
  This includes fog and WPOS.
* Unknown shader semantic names are ignored.

1 files changed, 10 insertions, 2 deletions

diff --git a/src/gallium/drivers/r300/r300_render.c b/src/gallium/drivers/r300/r300_render.c
index 44da7aa377..751a7e6d5b 100644
--- a/src/gallium/drivers/r300/r300_render.c
+++ b/src/gallium/drivers/r300/r300_render.c
@@ -273,7 +273,11 @@ void r500_emit_draw_arrays(struct r300_context *r300,
     CS_LOCALS(r300);
 
     if (alt_num_verts) {
-        assert(count < (1 << 24));
+        if (count >= (1 << 24)) {
+            fprintf(stderr, "r300: Got a huge number of vertices: %i, "
+                    "refusing to render.\n", count);
+            return;
+        }
         BEGIN_CS(9);
         OUT_CS_REG(R500_VAP_ALT_NUM_VERTICES, count);
     } else {
@@ -309,7 +313,11 @@ void r500_emit_draw_elements(struct r300_context *r300,
 #endif
     CS_LOCALS(r300);
 
-    assert(count < (1 << 24));
+    if (count >= (1 << 24)) {
+        fprintf(stderr, "r300: Got a huge number of vertices: %i, "
+                "refusing to render.\n", count);
+        return;
+    }
 
     maxIndex = MIN2(maxIndex, r300->vertex_buffer_max_index);