diff options
| -rw-r--r-- | src/mesa/main/glformats.c | 26 | ||||
| -rw-r--r-- | src/mesa/main/glformats.h | 3 |
2 files changed, 29 insertions, 0 deletions
diff --git a/src/mesa/main/glformats.c b/src/mesa/main/glformats.c index 5683d4b0a1a..fb69421c086 100644 --- a/src/mesa/main/glformats.c +++ b/src/mesa/main/glformats.c @@ -1058,6 +1058,32 @@ _mesa_base_format_has_channel(GLenum base_format, GLenum pname) /** + * Returns the number of channels/components for a base format. + */ +GLint +_mesa_base_format_component_count(GLenum base_format) +{ + switch (base_format) { + case GL_RED: + case GL_ALPHA: + case GL_INTENSITY: + case GL_DEPTH_COMPONENT: + return 1; + case GL_RG: + case GL_LUMINANCE_ALPHA: + case GL_DEPTH_STENCIL: + return 2; + case GL_RGB: + return 3; + case GL_RGBA: + return 4; + default: + return -1; + } +} + + +/** * If format is a generic compressed format, return the corresponding * non-compressed format. For other formats, return the format as-is. */ diff --git a/src/mesa/main/glformats.h b/src/mesa/main/glformats.h index d1208ef4ffe..fe604ddc973 100644 --- a/src/mesa/main/glformats.h +++ b/src/mesa/main/glformats.h @@ -100,6 +100,9 @@ _mesa_base_format_to_integer_format(GLenum format); extern GLboolean _mesa_base_format_has_channel(GLenum base_format, GLenum pname); +extern GLint +_mesa_base_format_component_count(GLenum base_format); + extern GLenum _mesa_generic_compressed_format_to_uncompressed_format(GLenum format); |