Fix text drawing with core profile

The issue was going to the fact that GL_ALPHA was deprecated in core profile
and common solution online is to use GL_RED instead. That is what is done in
this commit.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/blenfont/intern/blf_glyph.c b/source/blender/blenfont/intern/blf_glyph.c
index f99f1bf0d6d..a7d52e96800 100644
--- a/source/blender/blenfont/intern/blf_glyph.c
+++ b/source/blender/blenfont/intern/blf_glyph.c
@@ -183,7 +183,7 @@ static void blf_glyph_cache_texture(FontBLF *font, GlyphCacheBLF *gc)
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA8, gc->p2_width, gc->p2_height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, NULL);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, gc->p2_width, gc->p2_height, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);
 }
 
 GlyphBLF *blf_glyph_search(GlyphCacheBLF *gc, unsigned int c)
@@ -459,7 +459,7 @@ void blf_glyph_render(FontBLF *font, GlyphBLF *g, float x, float y)
 		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 
 		glBindTexture(GL_TEXTURE_2D, g->tex);
-		glTexSubImage2D(GL_TEXTURE_2D, 0, g->xoff, g->yoff, g->width, g->height, GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap);
+		glTexSubImage2D(GL_TEXTURE_2D, 0, g->xoff, g->yoff, g->width, g->height, GL_RED, GL_UNSIGNED_BYTE, g->bitmap);
 
 		glPixelStorei(GL_UNPACK_LSB_FIRST, lsb_first);
 		glPixelStorei(GL_UNPACK_ROW_LENGTH, row_length);