diff options
| -rw-r--r-- | src/mesa/main/formats.c | 29 | ||||
| -rw-r--r-- | src/mesa/main/formats.h | 4 |
2 files changed, 33 insertions, 0 deletions
diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c index e74625f2369..fb2501c69a2 100644 --- a/src/mesa/main/formats.c +++ b/src/mesa/main/formats.c @@ -2207,6 +2207,35 @@ _mesa_format_num_components(mesa_format format) /** + * Returns true if a color format has data stored in the R/G/B/A channels, + * given an index from 0 to 3. + */ +bool +_mesa_format_has_color_component(mesa_format format, int component) +{ + const struct gl_format_info *info = _mesa_get_format_info(format); + + assert(info->BaseFormat != GL_DEPTH_COMPONENT && + info->BaseFormat != GL_DEPTH_STENCIL && + info->BaseFormat != GL_STENCIL_INDEX); + + switch (component) { + case 0: + return (info->RedBits + info->IntensityBits + info->LuminanceBits) > 0; + case 1: + return (info->GreenBits + info->IntensityBits + info->LuminanceBits) > 0; + case 2: + return (info->BlueBits + info->IntensityBits + info->LuminanceBits) > 0; + case 3: + return (info->AlphaBits + info->IntensityBits) > 0; + default: + assert(!"Invalid color component: must be 0..3"); + return false; + } +} + + +/** * Return number of bytes needed to store an image of the given size * in the given format. */ diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h index 3079f0356cf..89bd0219eab 100644 --- a/src/mesa/main/formats.h +++ b/src/mesa/main/formats.h @@ -34,6 +34,7 @@ #include <GL/gl.h> +#include <stdbool.h> #ifdef __cplusplus @@ -474,6 +475,9 @@ _mesa_get_uncompressed_format(mesa_format format); extern GLuint _mesa_format_num_components(mesa_format format); +extern bool +_mesa_format_has_color_component(mesa_format format, int component); + GLboolean _mesa_format_matches_format_and_type(mesa_format mesa_format, GLenum format, GLenum type, |