gallium: add a flag to turn on gl rasterization rules

Use this to set up hardware rasterization (if your hardware can
do it) or otherwise turn on various tweaks in the draw module.

Currently only hooked up to point biasing code.

1 files changed, 13 insertions, 6 deletions

diff --git a/src/gallium/auxiliary/draw/draw_wide_point.c b/src/gallium/auxiliary/draw/draw_wide_point.c
index 86281ca3d8c..6fc7c9fcd7a 100644
--- a/src/gallium/auxiliary/draw/draw_wide_point.c
+++ b/src/gallium/auxiliary/draw/draw_wide_point.c
@@ -41,6 +41,9 @@ struct widepoint_stage {
    float point_size_min;
    float point_size_max;
 
+   float xbias;
+   float ybias;
+
    uint texcoord_slot[PIPE_MAX_SHADER_OUTPUTS];
    uint texcoord_mode[PIPE_MAX_SHADER_OUTPUTS];
    uint num_texcoords;
@@ -126,8 +129,6 @@ static void widepoint_point( struct draw_stage *stage,
    float *pos2 = v2->data[0];
    float *pos3 = v3->data[0];
 
-   const float xbias = 0.0, ybias = -0.125;
-
    /* point size is either per-vertex or fixed size */
    if (wide->psize_slot >= 0) {
       half_size = header->v[0]->data[wide->psize_slot][0];
@@ -144,10 +145,10 @@ static void widepoint_point( struct draw_stage *stage,
       half_size = wide->half_point_size;
    }
 
-   left_adj = -half_size + xbias;
-   right_adj = half_size + xbias;
-   bot_adj = half_size + ybias;
-   top_adj = -half_size + ybias;
+   left_adj = -half_size + wide->xbias;
+   right_adj = half_size + wide->xbias;
+   bot_adj = half_size + wide->ybias;
+   top_adj = -half_size + wide->ybias;
 
    pos0[0] += left_adj;
    pos0[1] += top_adj;
@@ -194,6 +195,12 @@ static void widepoint_first_point( struct draw_stage *stage,
    wide->half_point_size = 0.5f * draw->rasterizer->point_size;
    wide->point_size_min = draw->rasterizer->point_size_min;
    wide->point_size_max = draw->rasterizer->point_size_max;
+   wide->xbias = 0.0;
+   wide->ybias = 0.0;
+
+   if (draw->rasterizer->gl_rasterization_rules) {
+      wide->ybias = -0.125;
+   }
 
    /* XXX we won't know the real size if it's computed by the vertex shader! */
    if ((draw->rasterizer->point_size > draw->wide_point_threshold) ||