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test-cogl-tex-foreign: save and restore GL state correctly

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This test breaks out into raw OpenGL to create a foreign 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 16:30:25 +01:00
parent 3907825d05
commit 4f0a4b8521
1 changed files with 15 additions and 1 deletions
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16
tests/interactive/test-cogl-tex-foreign.c
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@ -122,6 +122,8 @@ test_coglbox_init (TestCoglbox *self)
{
TestCoglboxPrivate *priv;
guchar data[12];
GLint prev_unpack_alignment;
GLint prev_2d_texture_binding;
self->priv = priv = TEST_COGLBOX_GET_PRIVATE(self);
@ -131,13 +133,25 @@ test_coglbox_init (TestCoglbox *self)
data[3] = 0; data[4] = 255; data[5] = 0;
data[6] = 0; data[7] = 0; data[8] = 255;
data[9] = 0; data[10] = 0; data[11] = 0;
/* We are about to use OpenGL directly to create a TEXTURE_2D
* 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_ALIGNMENT, &prev_unpack_alignment);
glGetIntegerv (GL_TEXTURE_BINDING_2D, &prev_2d_texture_binding);
glGenTextures (1, &priv->gl_handle);
glBindTexture (GL_TEXTURE_2D, priv->gl_handle);
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGB,
2, 2, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
/* Now restore the original GL state as Cogl had left it */
glPixelStorei (GL_UNPACK_ALIGNMENT, prev_unpack_alignment);
glBindTexture (GL_TEXTURE_2D, prev_2d_texture_binding);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);