draw/gs: Correctly iterate the emitted primitives

We were assuming that each emitted primitive had the same
number of vertices. That is incorrect. Emitted primitives
can have arbirtrary number of vertices. Simply increment
index on iteration to fix it.

Signed-off-by: Zack Rusin <[email protected]>
Reviewed-by: José Fonseca <[email protected]>

1 files changed, 4 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/draw/draw_gs.c b/src/gallium/auxiliary/draw/draw_gs.c
index 99335af12d3..e605965fd87 100644
--- a/src/gallium/auxiliary/draw/draw_gs.c
+++ b/src/gallium/auxiliary/draw/draw_gs.c
@@ -172,6 +172,7 @@ draw_geometry_fetch_outputs(struct draw_geometry_shader *shader,
 {
    struct tgsi_exec_machine *machine = shader->machine;
    unsigned prim_idx, j, slot;
+   unsigned current_idx = 0;
    float (*output)[4];
 
    output = *p_output;
@@ -184,9 +185,8 @@ draw_geometry_fetch_outputs(struct draw_geometry_shader *shader,
       shader->primitive_lengths[prim_idx +   shader->emitted_primitives] =
          machine->Primitives[prim_idx];
       shader->emitted_vertices += num_verts_per_prim;
-      for (j = 0; j < num_verts_per_prim; j++) {
-         int idx = (prim_idx * num_verts_per_prim + j) *
-                   shader->info.num_outputs;
+      for (j = 0; j < num_verts_per_prim; j++, current_idx++) {
+         int idx = current_idx * shader->info.num_outputs;
 #ifdef DEBUG_OUTPUTS
          debug_printf("%d) Output vert:\n", idx / shader->info.num_outputs);
 #endif
@@ -208,7 +208,7 @@ draw_geometry_fetch_outputs(struct draw_geometry_shader *shader,
       }
    }
    *p_output = output;
-         shader->emitted_primitives += num_primitives;
+   shader->emitted_primitives += num_primitives;
 }
 
 /*#define DEBUG_INPUTS 1*/