console: avoid unneeded matrix transformations

We now assume a screen of -1,-1 to 1,1 instead of 0,0 to 1,1 to avoid
matrix transformations.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

2 files changed, 3 insertions, 4 deletions

diff --git a/src/console.c b/src/console.c
index 8bc5fb2..771473a 100644
--- a/src/console.c
+++ b/src/console.c
@@ -768,8 +768,6 @@ static void kmscon_buffer_draw(struct kmscon_buffer *buf,
 	}
 
 	gl_m4_identity(m);
-	gl_m4_translate(m, -1, -1, 0);
-	gl_m4_scale(m, 2, 2, 1);
 	font_screen_draw_perform(fscr, m);
 }
 
diff --git a/src/font_pango.c b/src/font_pango.c
index 069b654..835c4f2 100644
--- a/src/font_pango.c
+++ b/src/font_pango.c
@@ -729,14 +729,15 @@ int font_screen_draw_char(struct font_screen *screen, kmscon_symbol_t ch,
 
 int font_screen_draw_perform(struct font_screen *screen, float *m)
 {
-	static const float val[] = { 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1 };
+	static const float ver[] = { -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, -1, 1 };
+	static const float tex[] = { 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1 };
 
 	if (!screen)
 		return -EINVAL;
 
 	gl_tex_load(screen->tex, screen->buf->width, screen->buf->stride,
 			screen->buf->height, screen->buf->data);
-	gl_shader_draw_tex(screen->shader, val, val, 6, screen->tex, m);
+	gl_shader_draw_tex(screen->shader, ver, tex, 6, screen->tex, m);
 	cairo_restore(screen->cr);
 
 	return 0;