tex: clamp to a transparent texture borderrev2

Even with the MSAA off there were occasional fringes showing up,
turns out it's because of the default GL texture wrap mode.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/tex.c b/src/tex.c
index b8254e1..b67af17 100644
--- a/src/tex.c
+++ b/src/tex.c
@@ -153,6 +153,12 @@ tex_t * tex_new(int width, int height, const unsigned char *buf)
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 
+	/* transparent border pixels outside of the texture boundaries, this
+	 * eliminates the spurious fringing on some sprites/positions */
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+	glTexParameterfv(GL_TEXTURE_3D, GL_TEXTURE_BORDER_COLOR, (float[4]){});
+
 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, buf);
 	glBindTexture(GL_TEXTURE_2D, 0);