OpenGL: image drawing tweaks

- no need to allocate client memory up front
- delete unneeded GL calls
- set default alpha test function on exit

2 files changed, 2 insertions, 8 deletions

diff --git a/source/blender/editors/screen/glutil.c b/source/blender/editors/screen/glutil.c
index cbb6b7685af..44ccf9a56bf 100644
--- a/source/blender/editors/screen/glutil.c
+++ b/source/blender/editors/screen/glutil.c
@@ -351,8 +351,6 @@ static int get_cached_work_texture(int *r_w, int *r_h)
 	static int tex_h = 256;
 
 	if (texid == -1) {
-		unsigned char *tbuf;
-
 		glGenTextures(1, (GLuint *)&texid);
 
 		glBindTexture(GL_TEXTURE_2D, texid);
@@ -360,9 +358,7 @@ static int get_cached_work_texture(int *r_w, int *r_h)
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 
-		tbuf = MEM_callocN(tex_w * tex_h * 4, "tbuf");
-		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_w, tex_h, 0, GL_RGBA, GL_UNSIGNED_BYTE, tbuf);
-		MEM_freeN(tbuf);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, tex_w, tex_h, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
 
 		glBindTexture(GL_TEXTURE_2D, 0);
 	}
diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 41b22f49613..f3a3472f0cf 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -663,13 +663,12 @@ static void draw_empty_image(Object *ob, const short dflag, const unsigned char
 
 		/* Draw the Image on the screen */
 		glaDrawPixelsTex(ofs_x, ofs_y, ima_x, ima_y, GL_RGBA, GL_UNSIGNED_BYTE, zoomfilter, ibuf->rect);
-		glPixelTransferf(GL_ALPHA_SCALE, 1.0f);
 
 		glDisable(GL_BLEND);
 
 		if (use_clip) {
 			glDisable(GL_ALPHA_TEST);
-			glAlphaFunc(GL_GREATER, 0.0f);
+			glAlphaFunc(GL_ALWAYS, 0.0f);
 		}
 	}
 
@@ -686,7 +685,6 @@ static void draw_empty_image(Object *ob, const short dflag, const unsigned char
 	glEnd();
 
 	/* Reset GL settings */
-	glMatrixMode(GL_MODELVIEW);
 	glPopMatrix();
 
 	BKE_image_release_ibuf(ima, ibuf, NULL);