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cogl-material: Add support for point sprites

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This adds a new API call to enable point sprite coordinate generation
for a material layer:

void
cogl_material_set_layer_point_sprite_coords_enabled (CoglHandle material,
                                                     int layer_index,
                                                     gboolean enable);

There is also a corresponding get function.

Enabling point sprite coords simply sets the GL_COORD_REPLACE of the
GL_POINT_SPRITE glTexEnv when flusing the material. There is no
separate application control for glEnable(GL_POINT_SPRITE). Instead it
is left permanently enabled under the assumption that it has no affect
unless GL_COORD_REPLACE is enabled for a texture unit.

http://bugzilla.openedhand.com/show_bug.cgi?id=2047
This commit is contained in:
Neil Roberts
2010-03-22 13:33:55 +00:00
committed by Robert Bragg
parent 06b58baa10
commit da3be3df6b
10 changed files with 306 additions and 31 deletions
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5
cogl/cogl-types.h
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@ -248,6 +248,8 @@ typedef enum { /*< prefix=COGL_PIXEL_FORMAT >*/
* @COGL_FEATURE_TEXTURE_NPOT_REPEAT: Repeat modes other than
* %COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE are supported by the
* hardware.
* @COGL_FEATURE_POINT_SPRITE: Whether
* cogl_material_set_layer_point_sprite_coords_enabled() is supported.
*
* Flags for the supported features.
*
@ -271,7 +273,8 @@ typedef enum
COGL_FEATURE_DEPTH_RANGE = (1 << 14),
COGL_FEATURE_TEXTURE_NPOT_BASIC = (1 << 15),
COGL_FEATURE_TEXTURE_NPOT_MIPMAP = (1 << 16),
COGL_FEATURE_TEXTURE_NPOT_REPEAT = (1 << 17)
COGL_FEATURE_TEXTURE_NPOT_REPEAT = (1 << 17),
COGL_FEATURE_POINT_SPRITE = (1 << 18)
} CoglFeatureFlags;
/**