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test-cogl-texture-rectangle: save restore GL state correctly

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This test breaks out into raw OpenGL to create a RECTANGLE texture so it
needs to be careful not to trample on any state that may be cached by
Cogl internally.
This commit is contained in:
Robert Bragg 2010-04-26 16:27:59 +01:00
parent 2f8d4fc180
commit 3907825d05
1 changed files with 23 additions and 0 deletions
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23
tests/conform/test-cogl-texture-rectangle.c
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@ -17,6 +17,11 @@ create_source_rect (void)
#ifdef GL_TEXTURE_RECTANGLE_ARB
int x, y;
GLint prev_unpack_row_length;
GLint prev_unpack_alignment;
GLint prev_unpack_skip_rows;
GLint prev_unpack_skip_pixles;
GLint prev_rectangle_binding;
guint8 *data = g_malloc (256 * 256 * 4), *p = data;
CoglHandle tex;
GLuint gl_tex;
@ -30,6 +35,17 @@ create_source_rect (void)
*(p++) = 255;
}
/* We are about to use OpenGL directly to create a TEXTURE_RECTANGLE
* texture so we need to save the state that we modify so we can
* restore it afterwards and be sure not to interfere with any state
* caching that Cogl may do internally.
*/
glGetIntegerv (GL_UNPACK_ROW_LENGTH, &prev_unpack_row_length);
glGetIntegerv (GL_UNPACK_ALIGNMENT, &prev_unpack_alignment);
glGetIntegerv (GL_UNPACK_SKIP_ROWS, &prev_unpack_skip_rows);
glGetIntegerv (GL_UNPACK_SKIP_PIXELS, &prev_unpack_skip_pixles);
glGetIntegerv (GL_TEXTURE_BINDING_RECTANGLE_ARB, &prev_rectangle_binding);
glPixelStorei (GL_UNPACK_ROW_LENGTH, 256);
glPixelStorei (GL_UNPACK_ALIGNMENT, 8);
glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
@ -43,6 +59,13 @@ create_source_rect (void)
GL_UNSIGNED_BYTE,
data);
/* Now restore the original GL state as Cogl had left it */
glPixelStorei (GL_UNPACK_ROW_LENGTH, prev_unpack_row_length);
glPixelStorei (GL_UNPACK_ALIGNMENT, prev_unpack_alignment);
glPixelStorei (GL_UNPACK_SKIP_ROWS, prev_unpack_skip_rows);
glPixelStorei (GL_UNPACK_SKIP_PIXELS, prev_unpack_skip_pixles);
glBindTexture (GL_TEXTURE_RECTANGLE_ARB, prev_rectangle_binding);
g_assert (glGetError () == GL_NO_ERROR);
g_free (data);