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[test-backface-culling] Check that inverted tex coords don't affect culling

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The additional check draws another front facing rectangle but this time with
the texture coords flipped on the x axis.  The code that handles sliced
textures in cogl-primitives.c makes some suspicious changes to the geometry
when the texture coords are inverted.
This commit is contained in:
Robert Bragg 2009-09-06 21:47:46 +01:00
parent 2f628b1a8a
commit 8790306629
1 changed files with 20 additions and 8 deletions
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28
tests/conform/test-backface-culling.c
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@ -74,27 +74,31 @@ validate_result (TestState *state)
{
/* Front-facing texture */
g_assert (validate_part (0, 0, TRUE));
/* Front-facing texture with flipped tex coords */
g_assert (validate_part (1, 0, TRUE));
/* Back-facing texture */
g_assert (validate_part (1, 0, FALSE));
g_assert (validate_part (2, 0, FALSE));
/* Front-facing texture polygon */
g_assert (validate_part (2, 0, TRUE));
g_assert (validate_part (3, 0, TRUE));
/* Back-facing texture polygon */
g_assert (validate_part (3, 0, FALSE));
g_assert (validate_part (4, 0, FALSE));
/* Regular rectangle */
g_assert (validate_part (4, 0, TRUE));
g_assert (validate_part (5, 0, TRUE));
/* Backface culling disabled - everything should be shown */
/* Front-facing texture */
g_assert (validate_part (0, 1, TRUE));
/* Back-facing texture */
/* Front-facing texture with flipped tex coords */
g_assert (validate_part (1, 1, TRUE));
/* Front-facing texture polygon */
/* Back-facing texture */
g_assert (validate_part (2, 1, TRUE));
/* Back-facing texture polygon */
/* Front-facing texture polygon */
g_assert (validate_part (3, 1, TRUE));
/* Regular rectangle */
/* Back-facing texture polygon */
g_assert (validate_part (4, 1, TRUE));
/* Regular rectangle */
g_assert (validate_part (5, 1, TRUE));
/* Comment this out if you want visual feedback of what this test
* paints.
@ -138,6 +142,14 @@ on_paint (ClutterActor *actor, TestState *state)
x1 = x2;
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
/* Draw a front-facing texture with flipped texcoords */
cogl_material_set_layer (material, 0, state->texture);
cogl_rectangle_with_texture_coords (x1, y1, x2, y2,
1.0, 0.0, 0.0, 1.0);
x1 = x2;
x2 = x1 + (float)(TEXTURE_RENDER_SIZE);
/* Draw a back-facing texture */
cogl_material_set_layer (material, 0, state->texture);
cogl_rectangle (x2, y1, x1, y2);