X-Git-Url: https://harrygodden.com/git/?a=blobdiff_plain;f=vg%2Fvg_tex.h;fp=vg%2Fvg_tex.h;h=4c14540ca431a4b5404534dc5d44f27938e04467;hb=6836e834f8db725e08015a98401f2be97e5b9849;hp=0000000000000000000000000000000000000000;hpb=b5740880fe3ffe59546bb80173ad3a6e1312648e;p=vg.git

diff --git a/vg/vg_tex.h b/vg/vg_tex.h
new file mode 100644
index 0000000..4c14540
--- /dev/null
+++ b/vg/vg_tex.h
@@ -0,0 +1,134 @@
+// Copyright (C) 2021 Harry Godden (hgn) - All Rights Reserved
+
+#define VG_TEXTURE_NO_MIP 	0x1
+#define VG_TEXTURE_REPEAT 	0x2
+#define VG_TEXTURE_CLAMP	0x4
+#define VG_TEXTURE_NEAREST	0x8
+
+struct vg_tex2d
+{
+	const char *path;
+	u32 flags;
+	GLuint name;
+};
+
+struct vg_sprite
+{
+	v4f uv_xywh;
+};
+
+static void vg_tex2d_bind( vg_tex2d *tex, u32 id )
+{
+	glActiveTexture( GL_TEXTURE0 + id );
+	glBindTexture( GL_TEXTURE_2D, tex->name );
+}
+
+static inline void vg_tex2d_mipmap(void) 
+{ 
+	glGenerateMipmap( GL_TEXTURE_2D );
+}
+
+static inline void vg_tex2d_linear(void)
+{
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+}
+
+static inline void vg_tex2d_nearest(void)
+{
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
+}
+
+static inline void vg_tex2d_linear_mipmap(void)
+{
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+}
+
+static inline void vg_tex2d_repeat(void)
+{
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
+}
+
+static inline void vg_tex2d_clamp(void)
+{
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
+}
+
+static GLuint vg_tex2d_rgba( const char *path )
+{
+	i64 length;
+	u8 *src_data = vg_asset_read_s( path, &length );
+	
+	GLuint texture_name;
+	glGenTextures( 1, &texture_name );
+	glBindTexture( GL_TEXTURE_2D, texture_name );
+	
+	if( src_data )
+	{
+		qoi_desc info;
+		u8 *tex_buffer = qoi_decode( src_data, length, &info, 4 );
+		
+		glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, info.width, info.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex_buffer );
+		
+		free( tex_buffer );
+		free( src_data );
+	}
+	else
+	{
+		u32 tex_err[4] =
+		{
+			0xffff00ff,
+			0xff000000,
+			0xff000000,
+			0xffff00ff
+		};
+	
+		vg_error( "Loading texture failed (%s)\n", path );
+		glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex_err );
+	}
+	
+	return texture_name;
+}
+
+static void vg_tex2d_init( vg_tex2d *textures[], int num )
+{
+	for( int i = 0; i < num; i ++ )
+	{
+		vg_tex2d *tex = textures[i];
+		tex->name = vg_tex2d_rgba( tex->path );
+		if( !(tex->flags & VG_TEXTURE_NO_MIP) )
+			vg_tex2d_mipmap();
+
+		if( tex->flags & VG_TEXTURE_NEAREST )
+		{
+			if( tex->flags & VG_TEXTURE_NO_MIP )
+				vg_error( "Invalid texture settings\n" );
+			else
+				vg_tex2d_nearest();
+		}
+		else
+		{
+			if( tex->flags & VG_TEXTURE_NO_MIP )
+				vg_tex2d_linear();
+			else
+				vg_tex2d_linear_mipmap();
+		}
+		
+		if( tex->flags & VG_TEXTURE_CLAMP )
+			vg_tex2d_clamp();
+		else
+			vg_tex2d_repeat();
+	}
+}
+
+static void vg_tex2d_free( vg_tex2d *textures[], int num )
+{
+	for( int i = 0; i < num; i ++ )
+	{
+		glDeleteTextures( 1, &textures[i]->name );
+	}
+}