wined3d: Construct the projection matrix directly in set_blit_dimension().

This saves a needless matrix multiplication and is actually more obvious than the glOrtho() call.

wined3d: Construct the projection matrix directly in set_blit_dimension().
1c91b082 · Henri Verbeet · Alexandre Julliard · 98932221 · 1c91b082
Commit 1c91b082 authored Nov 01, 2011 by Henri Verbeet Committed by Alexandre Julliard Nov 02, 2011
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context.c dlls/wined3d/context.c +12 -5

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--- a/dlls/wined3d/context.c
+++ b/dlls/wined3d/context.c
@@ -1666,13 +1666,20 @@ void context_destroy(struct wined3d_device *device, struct wined3d_context *cont
 }

 /* GL locking is done by the caller */
-static inline void set_blit_dimension(UINT width, UINT height) {
+static void set_blit_dimension(UINT width, UINT height)
+{
+    const GLdouble projection[] =
+    {
+        2.0 / width,          0.0,  0.0, 0.0,
+                0.0, 2.0 / height,  0.0, 0.0,
+                0.0,          0.0,  2.0, 0.0,
+               -1.0,         -1.0, -1.0, 1.0,
+    };
+
    glMatrixMode(GL_PROJECTION);
    checkGLcall("glMatrixMode(GL_PROJECTION)");
-    glLoadIdentity();
-    checkGLcall("glLoadIdentity()");
-    glOrtho(0, width, 0, height, 0.0, -1.0);
-    checkGLcall("glOrtho");
+    glLoadMatrixd(projection);
+    checkGLcall("glLoadMatrixd");
    glViewport(0, 0, width, height);
    checkGLcall("glViewport");
 }