Change DrawQ_Pic and _SuperPic to be texel correct to fix bad clamping behavior.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7652 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/gl_draw.c b/gl_draw.c
index 082044c4a0996ebb234cbc5e25bdb3c8eb0701fd..b6d8d065000ea5ebab0d7b3317daf9c3e676b228 100644 (file)
--- a/gl_draw.c
+++ b/gl_draw.c
@@ -596,10 +596,17 @@ void DrawQ_Pic(float x, float y, cachepic_t *pic, float width, float height, flo
                        height = pic->height;
                R_Mesh_TexBind(0, R_GetTexture(pic->tex));
                R_Mesh_TexCoordPointer(0, 2, floats + 12, 0, 0);
-               floats[12] = 0;floats[13] = 0;
-               floats[14] = 1;floats[15] = 0;
-               floats[16] = 1;floats[17] = 1;
-               floats[18] = 0;floats[19] = 1;
+
+      // AK07: lets be texel correct on the corners
+      {
+         float horz_offset = 0.5f / width;
+         float vert_offset = 0.5f / height;
+
+                  floats[12] = 0.0f + horz_offset;floats[13] = 0.0f + vert_offset;
+                  floats[14] = 1.0f - horz_offset;floats[15] = 0.0f + vert_offset;
+                  floats[16] = 1.0f - horz_offset;floats[17] = 1.0f - vert_offset;
+                  floats[18] = 0.0f + horz_offset;floats[19] = 1.0f - vert_offset;
+      }
        }
 
        floats[2] = floats[5] = floats[8] = floats[11] = 0;
@@ -845,10 +852,17 @@ void DrawQ_SuperPic(float x, float y, cachepic_t *pic, float width, float height
                        height = pic->height;
                R_Mesh_TexBind(0, R_GetTexture(pic->tex));
                R_Mesh_TexCoordPointer(0, 2, floats + 12, 0, 0);
-               floats[12] = s1;floats[13] = t1;
-               floats[14] = s2;floats[15] = t2;
-               floats[16] = s4;floats[17] = t4;
-               floats[18] = s3;floats[19] = t3;
+
+      // AK07: lets be texel correct on the corners
+      {
+         float horz_offset = 0.5f / width;
+         float vert_offset = 0.5f / height;
+
+         floats[12] = s1 + horz_offset;floats[13] = t1 + vert_offset;
+         floats[14] = s2 - horz_offset;floats[15] = t2 + vert_offset;
+         floats[16] = s4 - horz_offset;floats[17] = t4 - vert_offset;
+         floats[18] = s3 + horz_offset;floats[19] = t3 - vert_offset;
+      }
        }
 
        floats[2] = floats[5] = floats[8] = floats[11] = 0;