diff options
Diffstat (limited to 'src/egl/main/eglconfig.c')
| -rw-r--r-- | src/egl/main/eglconfig.c | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/src/egl/main/eglconfig.c b/src/egl/main/eglconfig.c new file mode 100644 index 00000000000..765e2e3dbeb --- /dev/null +++ b/src/egl/main/eglconfig.c @@ -0,0 +1,286 @@ +#include <string.h> +#include <assert.h> +#include "eglconfig.h" +#include "egldisplay.h" +#include "egldriver.h" +#include "eglglobals.h" + + +#define MIN2(A, B) (((A) < (B)) ? (A) : (B)) + + +/** + * Init the given _EGLconfig to default values. + * \param id the configuration's ID. + */ +void +_eglInitConfig(_EGLConfig *config, EGLint id) +{ + memset(config, 0, sizeof(*config)); + config->Handle = id; + SET_CONFIG_ATTRIB(config, EGL_CONFIG_ID, id); + SET_CONFIG_ATTRIB(config, EGL_BIND_TO_TEXTURE_RGB, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_BIND_TO_TEXTURE_RGBA, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_CONFIG_CAVEAT, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_NATIVE_RENDERABLE, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_NATIVE_VISUAL_TYPE, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_MIN_SWAP_INTERVAL, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_MAX_SWAP_INTERVAL, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_SURFACE_TYPE, EGL_WINDOW_BIT); + SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_TYPE, EGL_NONE); + SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_RED_VALUE, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE); + SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_BLUE_VALUE, EGL_DONT_CARE); +} + + +/** + * Given an EGLConfig handle, return the corresponding _EGLConfig object. + */ +_EGLConfig * +_eglLookupConfig(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config) +{ + EGLint i; + _EGLDisplay *disp = _eglLookupDisplay(dpy); + for (i = 0; i < disp->NumConfigs; i++) { + if (disp->Configs[i].Handle == config) { + return disp->Configs + i; + } + } + return NULL; +} + + + +/** + * Parse the attrib_list to fill in the fields of the given _egl_config + * Return EGL_FALSE if any errors, EGL_TRUE otherwise. + */ +EGLBoolean +_eglParseConfigAttribs(_EGLConfig *config, const EGLint *attrib_list) +{ + EGLint i; + + /* XXX set all config attribs to EGL_DONT_CARE */ + + for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) { + EGLint k = attrib_list[i] - FIRST_ATTRIB; + if (k >= 0 && k < MAX_ATTRIBS) { + config->Attrib[k] = attrib_list[++i]; + } + else { + _eglError(EGL_BAD_ATTRIBUTE, "eglChooseConfig"); + return EGL_FALSE; + } + } + return EGL_TRUE; +} + + +#define EXACT 1 +#define ATLEAST 2 +#define MASK 3 +#define SMALLER 4 +#define SPECIAL 5 +#define NONE 6 + +struct sort_info { + EGLint Attribute; + EGLint MatchCriteria; + EGLint SortOrder; +}; + +/* This encodes the info from Table 3.5 of the EGL spec, ordered by + * Sort Priority. + */ +static struct sort_info SortInfo[] = { + { EGL_CONFIG_CAVEAT, EXACT, SPECIAL }, + { EGL_RED_SIZE, ATLEAST, SPECIAL }, + { EGL_GREEN_SIZE, ATLEAST, SPECIAL }, + { EGL_BLUE_SIZE, ATLEAST, SPECIAL }, + { EGL_ALPHA_SIZE, ATLEAST, SPECIAL }, + { EGL_BUFFER_SIZE, ATLEAST, SMALLER }, + { EGL_SAMPLE_BUFFERS, ATLEAST, SMALLER }, + { EGL_SAMPLES, ATLEAST, SMALLER }, + { EGL_DEPTH_SIZE, ATLEAST, SMALLER }, + { EGL_STENCIL_SIZE, ATLEAST, SMALLER }, + { EGL_NATIVE_VISUAL_TYPE, EXACT, SPECIAL }, + { EGL_CONFIG_ID, EXACT, SMALLER }, + { EGL_BIND_TO_TEXTURE_RGB, EXACT, NONE }, + { EGL_BIND_TO_TEXTURE_RGBA, EXACT, NONE }, + { EGL_LEVEL, EXACT, NONE }, + { EGL_NATIVE_RENDERABLE, EXACT, NONE }, + { EGL_MAX_SWAP_INTERVAL, EXACT, NONE }, + { EGL_MIN_SWAP_INTERVAL, EXACT, NONE }, + { EGL_SURFACE_TYPE, MASK, NONE }, + { EGL_TRANSPARENT_TYPE, EXACT, NONE }, + { EGL_TRANSPARENT_RED_VALUE, EXACT, NONE }, + { EGL_TRANSPARENT_GREEN_VALUE, EXACT, NONE }, + { EGL_TRANSPARENT_BLUE_VALUE, EXACT, NONE }, + { 0, 0, 0 } +}; + + +/** + * Return EGL_TRUE if the attributes of c meet or exceed the minimums + * specified by min. + */ +EGLBoolean +_eglConfigQualifies(const _EGLConfig *c, const _EGLConfig *min) +{ + EGLint i; + for (i = 0; SortInfo[i].Attribute != 0; i++) { + const EGLint mv = GET_CONFIG_ATTRIB(min, SortInfo[i].Attribute); + if (mv != EGL_DONT_CARE) { + const EGLint cv = GET_CONFIG_ATTRIB(c, SortInfo[i].Attribute); + if (SortInfo[i].MatchCriteria == EXACT) { + if (cv != mv) { + return EGL_FALSE; + } + } + else if (SortInfo[i].MatchCriteria == ATLEAST) { + if (cv < mv) { + return EGL_FALSE; + } + } + else { + assert(SortInfo[i].MatchCriteria == MASK); + if ((mv & cv) != mv) { + return EGL_FALSE; + } + } + } + } + return EGL_TRUE; +} + + +/** + * Compare configs 'a' and 'b' and return -1 if a belongs before b, + * 1 if a belongs after b, or 0 if they're equal. + */ +EGLint +_eglCompareConfigs(const _EGLConfig *a, const _EGLConfig *b) +{ + EGLint i; + for (i = 0; SortInfo[i].Attribute != 0; i++) { + const EGLint av = GET_CONFIG_ATTRIB(a, SortInfo[i].Attribute); + const EGLint bv = GET_CONFIG_ATTRIB(b, SortInfo[i].Attribute); + if (SortInfo[i].SortOrder == SMALLER) { + if (av < bv) + return -1; + else if (av > bv) + return 1; + /* else, continue examining attribute values */ + } + else if (SortInfo[i].SortOrder == SPECIAL) { + if (SortInfo[i].Attribute == EGL_CONFIG_CAVEAT) { + /* values are EGL_NONE, SLOW_CONFIG, or NON_CONFORMANT_CONFIG */ + if (av < bv) + return -1; + else if (av > bv) + return 1; + } + else if (SortInfo[i].Attribute == EGL_RED_SIZE || + SortInfo[i].Attribute == EGL_GREEN_SIZE || + SortInfo[i].Attribute == EGL_BLUE_SIZE || + SortInfo[i].Attribute == EGL_ALPHA_SIZE) { + if (av > bv) + return -1; + else if (av < bv) + return 1; + } + else { + assert(SortInfo[i].Attribute == EGL_NATIVE_VISUAL_TYPE); + if (av < bv) + return -1; + else if (av > bv) + return 1; + } + } + else { + assert(SortInfo[i].SortOrder == NONE); + /* continue examining attribute values */ + } + } + return 0; +} + + +/** + * Typical fallback routine for eglChooseConfig + */ +EGLBoolean +_eglChooseConfig(_EGLDriver *drv, EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config) +{ + _EGLDisplay *disp = _eglLookupDisplay(dpy); + _EGLConfig criteria; + EGLint i; + + /* parse the attrib_list to initialize criteria */ + if (!_eglParseConfigAttribs(&criteria, attrib_list)) { + return EGL_FALSE; + } + + *num_config = 0; + for (i = 0; i < disp->NumConfigs; i++) { + const _EGLConfig *conf = disp->Configs + i; + if (_eglConfigQualifies(conf, &criteria)) { + if (*num_config < config_size) { + /* save */ + configs[*num_config] = conf->Handle; + (*num_config)++; + } + else { + break; + } + } + } + + /* XXX sort the list here */ + + return EGL_TRUE; +} + + +/** + * Fallback for eglGetConfigAttrib. + */ +EGLBoolean +_eglGetConfigAttrib(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value) +{ + const _EGLConfig *conf = _eglLookupConfig(drv, dpy, config); + const EGLint k = attribute - FIRST_ATTRIB; + if (k >= 0 && k < MAX_ATTRIBS) { + *value = conf->Attrib[k]; + return EGL_TRUE; + } + else { + _eglError(EGL_BAD_ATTRIBUTE, "eglGetConfigAttrib"); + return EGL_FALSE; + } +} + + +/** + * Fallback for eglGetConfigs. + */ +EGLBoolean +_eglGetConfigs(_EGLDriver *drv, EGLDisplay dpy, EGLConfig *configs, EGLint config_size, EGLint *num_config) +{ + _EGLDisplay *disp = _eglLookupDisplay(dpy); + + if (!drv->Initialized) { + _eglError(EGL_NOT_INITIALIZED, "eglGetConfigs"); + return EGL_FALSE; + } + + *num_config = MIN2(disp->NumConfigs, config_size); + if (configs) { + EGLint i; + for (i = 0; i < *num_config; i++) { + configs[i] = disp->Configs[i].Handle; + } + } + return EGL_TRUE; +} |