[i915] fix fragment.position

1 files changed, 21 insertions, 6 deletions

diff --git a/src/mesa/drivers/dri/i915/intel_tris.c b/src/mesa/drivers/dri/i915/intel_tris.c
index 29f0b51ba63..bbb4e0f3cda 100644
--- a/src/mesa/drivers/dri/i915/intel_tris.c
+++ b/src/mesa/drivers/dri/i915/intel_tris.c
@@ -311,10 +311,18 @@ intel_wpos_triangle(struct intel_context *intel,
 {
    GLuint offset = intel->wpos_offset;
    GLuint size = intel->wpos_size;
+   GLfloat *v0_wpos = (GLfloat *)((char *)v0 + offset);
+   GLfloat *v1_wpos = (GLfloat *)((char *)v1 + offset);
+   GLfloat *v2_wpos = (GLfloat *)((char *)v2 + offset);
+
+   __memcpy(v0_wpos, v0, size);
+   __memcpy(v1_wpos, v1, size);
+   __memcpy(v2_wpos, v2, size);
+
+   v0_wpos[1] = -v0_wpos[1] + intel->driDrawable->h;
+   v1_wpos[1] = -v1_wpos[1] + intel->driDrawable->h;
+   v2_wpos[1] = -v2_wpos[1] + intel->driDrawable->h;
 
-   __memcpy(((char *) v0) + offset, v0, size);
-   __memcpy(((char *) v1) + offset, v1, size);
-   __memcpy(((char *) v2) + offset, v2, size);
 
    intel_draw_triangle(intel, v0, v1, v2);
 }
@@ -326,9 +334,14 @@ intel_wpos_line(struct intel_context *intel,
 {
    GLuint offset = intel->wpos_offset;
    GLuint size = intel->wpos_size;
+   GLfloat *v0_wpos = (GLfloat *)((char *)v0 + offset);
+   GLfloat *v1_wpos = (GLfloat *)((char *)v1 + offset);
+
+   __memcpy(v0_wpos, v0, size);
+   __memcpy(v1_wpos, v1, size);
 
-   __memcpy(((char *) v0) + offset, v0, size);
-   __memcpy(((char *) v1) + offset, v1, size);
+   v0_wpos[1] = -v0_wpos[1] + intel->driDrawable->h;
+   v1_wpos[1] = -v1_wpos[1] + intel->driDrawable->h;
 
    intel_draw_line(intel, v0, v1);
 }
@@ -339,8 +352,10 @@ intel_wpos_point(struct intel_context *intel, intelVertexPtr v0)
 {
    GLuint offset = intel->wpos_offset;
    GLuint size = intel->wpos_size;
+   GLfloat *v0_wpos = (GLfloat *)((char *)v0 + offset);
 
-   __memcpy(((char *) v0) + offset, v0, size);
+   __memcpy(v0_wpos, v0, size);
+   v0_wpos[1] = -v0_wpos[1] + intel->driDrawable->h;
 
    intel_draw_point(intel, v0);
 }