draw: don't assume vertex position is in data[0]

1 files changed, 14 insertions, 11 deletions

diff --git a/src/gallium/auxiliary/draw/draw_pipe_aaline.c b/src/gallium/auxiliary/draw/draw_pipe_aaline.c
index 634bf067f14..ecdebca5f12 100644
--- a/src/gallium/auxiliary/draw/draw_pipe_aaline.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_aaline.c
@@ -78,6 +78,8 @@ struct aaline_stage
 
    /** For AA lines, this is the vertex attrib slot for the new texcoords */
    uint tex_slot;
+   /** position, not necessarily output zero */
+   uint pos_slot;
 
    void *sampler_cso;
    struct pipe_texture *texture;
@@ -520,9 +522,10 @@ aaline_line(struct draw_stage *stage, struct prim_header *header)
    struct prim_header tri;
    struct vertex_header *v[8];
    uint texPos = aaline->tex_slot;
+   uint posPos = aaline->pos_slot;
    float *pos, *tex;
-   float dx = header->v[1]->data[0][0] - header->v[0]->data[0][0];
-   float dy = header->v[1]->data[0][1] - header->v[0]->data[0][1];
+   float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
+   float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
    double a = atan2(dy, dx);
    float c_a = (float) cos(a), s_a = (float) sin(a);
    uint i;
@@ -549,35 +552,35 @@ aaline_line(struct draw_stage *stage, struct prim_header *header)
     */
 
    /* new verts */
-   pos = v[0]->data[0];
+   pos = v[0]->data[posPos];
    pos[0] += (-dx * c_a -  dy * s_a);
    pos[1] += (-dx * s_a +  dy * c_a);
 
-   pos = v[1]->data[0];
+   pos = v[1]->data[posPos];
    pos[0] += (-dx * c_a - -dy * s_a);
    pos[1] += (-dx * s_a + -dy * c_a);
 
-   pos = v[2]->data[0];
+   pos = v[2]->data[posPos];
    pos[0] += ( dx * c_a -  dy * s_a);
    pos[1] += ( dx * s_a +  dy * c_a);
 
-   pos = v[3]->data[0];
+   pos = v[3]->data[posPos];
    pos[0] += ( dx * c_a - -dy * s_a);
    pos[1] += ( dx * s_a + -dy * c_a);
 
-   pos = v[4]->data[0];
+   pos = v[4]->data[posPos];
    pos[0] += (-dx * c_a -  dy * s_a);
    pos[1] += (-dx * s_a +  dy * c_a);
 
-   pos = v[5]->data[0];
+   pos = v[5]->data[posPos];
    pos[0] += (-dx * c_a - -dy * s_a);
    pos[1] += (-dx * s_a + -dy * c_a);
 
-   pos = v[6]->data[0];
+   pos = v[6]->data[posPos];
    pos[0] += ( dx * c_a -  dy * s_a);
    pos[1] += ( dx * s_a +  dy * c_a);
 
-   pos = v[7]->data[0];
+   pos = v[7]->data[posPos];
    pos[0] += ( dx * c_a - -dy * s_a);
    pos[1] += ( dx * s_a + -dy * c_a);
 
@@ -653,7 +656,7 @@ aaline_first_line(struct draw_stage *stage, struct prim_header *header)
 
    /* update vertex attrib info */
    aaline->tex_slot = draw->vs.num_vs_outputs;
-   assert(aaline->tex_slot > 0); /* output[0] is vertex pos */
+   aaline->pos_slot = draw->vs.position_output;
 
    /* advertise the extra post-transformed vertex attribute */
    draw->extra_vp_outputs.semantic_name = TGSI_SEMANTIC_GENERIC;