medfall

commit 11b51becfbada63812df07399b07e09263e59598
parent 2861c5654ff4e7d9cfeca6033fca3b747217cfa7
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Wed, 19 Dec 2018 17:41:09 +0200

draw_centered_text

Diffstat:
text_renderer.cc
 | 
28
++++++++++++++++++++++++++++
text_renderer.h
 | 
3
+++

2 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/text_renderer.cc b/text_renderer.cc
@@ -68,6 +68,29 @@ void text_renderer_term() {
 	renderer_delete_texture( atlas );
 }
 
+float text_width( const char * str, float pixel_size ) {
+	size_t size_idx = 0;
+	for( size_t i = 0; i < ARRAY_COUNT( sizes ); i++ ) {
+		size_idx = i;
+		if( pixel_size <= sizes[ i ].pixel_size ) {
+			break;
+		}
+	}
+
+	float scale = pixel_size / sizes[ size_idx ].pixel_size;
+	float width = 0;
+
+	while( *str != '\0' ) {
+		stbtt_aligned_quad q;
+		float y = 0;
+		stbtt_GetPackedQuad( sizes[ size_idx ].baked_chars, atlas_width, atlas_height, *str - ' ', &width, &y, &q, 0 );
+
+		str++;
+	}
+
+	return width * scale;
+}
+
 void draw_text( const char * str, int x, int y, float pixel_size ) {
 	const v4 white( 1, 1, 1, 1 );
 
@@ -132,3 +155,8 @@ void draw_text( const char * str, int x, int y, float pixel_size ) {
 
 	immediate_render( render_state );
 }
+
+void draw_centered_text( const char * str, int x, int y, float pixel_size ) {
+	float w = text_width( str, pixel_size );
+	draw_text( str, x - w / 2.0f, y, pixel_size );
+}
diff --git a/text_renderer.h b/text_renderer.h
@@ -5,4 +5,7 @@
 void text_renderer_init( MemoryArena * arena );
 void text_renderer_term();
 
+float text_width( const char * str, float pixel_size );
+
 void draw_text( const char * str, int x, int y, float pixel_size );
+void draw_centered_text( const char * str, int x, int y, float pixel_size );