From: hgn <hgodden00@gmail.com>
Date: Thu, 2 Jun 2022 15:28:50 +0000 (+0100)
Subject: maths and bugs
X-Git-Url: https://harrygodden.com/git/?p=vg.git;a=commitdiff_plain;h=f9b8c958c6221365d88a248e645aaebb6f7f1b90

maths and bugs
---

diff --git a/src/vg/vg_lines.h b/src/vg/vg_lines.h
index f57dd09..0263722 100644
--- a/src/vg/vg_lines.h
+++ b/src/vg/vg_lines.h
@@ -127,7 +127,6 @@ static void vg_lines_drawall( float* projection )
 	glEnable( GL_BLEND );
 	glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
 	glBlendEquation( GL_FUNC_ADD );
-	
 	glDrawArrays( GL_LINES, 0, vg_lines.draw_idx );
 	
 	glDisable( GL_BLEND );
diff --git a/src/vg/vg_m.h b/src/vg/vg_m.h
index a61c6f0..9f93416 100644
--- a/src/vg/vg_m.h
+++ b/src/vg/vg_m.h
@@ -598,6 +598,13 @@ static inline void m4x3_to_3x3( m4x3f a, m3x3f b )
 	v3_copy( a[2], b[2] );
 }
 
+static inline void m4x3_invert_affine( m4x3f a, m4x3f b )
+{
+   m3x3_transpose( a, b );
+   m3x3_mulv( b, a[3], b[3] );
+   v3_negate( b[3], b[3] );
+}
+
 static inline void m4x3_copy( m4x3f a, m4x3f b )
 {
 	v3_copy( a[0], b[0] );
diff --git a/src/vg/vg_platform.h b/src/vg/vg_platform.h
index 89315b6..7e70d81 100644
--- a/src/vg/vg_platform.h
+++ b/src/vg/vg_platform.h
@@ -1,3 +1,6 @@
+#ifndef VG_PLATFORM_H
+#define VG_PLATFORM_H
+
 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
 
 typedef uint8_t  u8;
@@ -107,3 +110,5 @@ int vg_thread_run( void *pfunc, void *data )
 	}
 #endif
 }
+
+#endif
diff --git a/src/vg/vg_shader.h b/src/vg/vg_shader.h
index da61186..0f1303b 100644
--- a/src/vg/vg_shader.h
+++ b/src/vg/vg_shader.h
@@ -66,17 +66,26 @@ struct vg_shader
 static GLuint vg_shader_subshader( const char *src, GLint gliShaderType )
 {
 	GLint shader = glCreateShader( gliShaderType );
+
+   if( shader == GL_NONE )
+   {
+      vg_error( "Could not 'glCreateShader()'\n" );
+      return 0;
+   }
+
 	glShaderSource( shader, 2, (const char *[2]){ vg_shader_gl_ver, src }, NULL );
 	glCompileShader( shader );
 
-	int success;
-	char infoLog[512];
-	glGetShaderiv( shader, GL_COMPILE_STATUS, &success );
+	GLint status;
+	glGetShaderiv( shader, GL_COMPILE_STATUS, &status );
 
-	if( !success )
+	if( status != GL_TRUE )
 	{
-		glGetShaderInfoLog( shader, 512, NULL, infoLog );
-		vg_error( "Error info:\n%s\n", infoLog );
+      GLchar info[1024];
+      GLsizei len;
+
+		glGetShaderInfoLog( shader, sizeof(info), &len, info );
+		vg_error( "Error info:\n%s\n", info );
 		return 0;
 	}
 
diff --git a/src/vg/vg_ui.h b/src/vg/vg_ui.h
index f7f8a1c..f36d363 100644
--- a/src/vg/vg_ui.h
+++ b/src/vg/vg_ui.h
@@ -1,5 +1,8 @@
 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
 
+#ifndef VG_UI_H
+#define VG_UI_H
+
 SHADER_DEFINE( shader_ui,
 
 	"layout (location=0) in vec2 a_co;"
@@ -853,3 +856,5 @@ static void ui_push_image( ui_ctx *ctx, ui_rect rc, GLuint image )
 #define gui_want_mouse() ui_want_mouse( &ui_global_ctx )
 #define gui_push_image(...) ui_push_image( &ui_global_ctx, __VA_ARGS__ )
 #define gui_reset_colours(...) ui_reset_colours( &ui_global_ctx )
+
+#endif