diff options
Diffstat (limited to 'src/egl/main/eglmode.c')
| -rw-r--r-- | src/egl/main/eglmode.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/src/egl/main/eglmode.c b/src/egl/main/eglmode.c new file mode 100644 index 00000000000..786432234bb --- /dev/null +++ b/src/egl/main/eglmode.c @@ -0,0 +1,431 @@ +#include <stdio.h> +#include <assert.h> +#include <stdlib.h> +#include <string.h> + +#include "egldisplay.h" +#include "egldriver.h" +#include "eglmode.h" +#include "eglglobals.h" +#include "eglscreen.h" + + +#define MIN2(A, B) (((A) < (B)) ? (A) : (B)) + + +static char * +my_strdup(const char *s) +{ + if (s) { + int l = strlen(s); + char *s2 = malloc(l + 1); + if (s2) + strcpy(s2, s); + return s2; + } + else { + return NULL; + } +} + + +/** + * Given an EGLModeMESA handle, return the corresponding _EGLMode object + * or null if non-existant. + */ +_EGLMode * +_eglLookupMode(EGLDisplay dpy, EGLModeMESA mode) +{ + const _EGLDisplay *disp = _eglLookupDisplay(dpy); + EGLint scrnum; + + /* loop over all screens on the display */ + for (scrnum = 0; scrnum < disp->NumScreens; scrnum++) { + const _EGLScreen *scrn = disp->Screens[scrnum]; + EGLint i; + /* search list of modes for handle */ + for (i = 0; i < scrn->NumModes; i++) { + if (scrn->Modes[i].Handle == mode) { + return scrn->Modes + i; + } + } + } + + return NULL; +} + + +/** + * Add a new mode with the given attributes (width, height, depth, refreshRate) + * to the given screen. + * Assign a new mode ID/handle to the mode as well. + * \return pointer to the new _EGLMode + */ +_EGLMode * +_eglAddNewMode(_EGLScreen *screen, EGLint width, EGLint height, + EGLint refreshRate, const char *name) +{ + EGLint n; + _EGLMode *newModes; + + assert(screen); + assert(width > 0); + assert(height > 0); + assert(refreshRate > 0); + + n = screen->NumModes; + newModes = (_EGLMode *) realloc(screen->Modes, (n+1) * sizeof(_EGLMode)); + if (newModes) { + screen->Modes = newModes; + screen->Modes[n].Handle = n + 1; + screen->Modes[n].Width = width; + screen->Modes[n].Height = height; + screen->Modes[n].RefreshRate = refreshRate; + screen->Modes[n].Optimal = EGL_FALSE; + screen->Modes[n].Interlaced = EGL_FALSE; + screen->Modes[n].Name = my_strdup(name); + screen->NumModes++; + return screen->Modes + n; + } + else { + return NULL; + } +} + + + +/** + * Parse the attrib_list to fill in the fields of the given _eglMode + * Return EGL_FALSE if any errors, EGL_TRUE otherwise. + */ +static EGLBoolean +_eglParseModeAttribs(_EGLMode *mode, const EGLint *attrib_list) +{ + EGLint i; + + /* init all attribs to EGL_DONT_CARE */ + mode->Handle = EGL_DONT_CARE; + mode->Width = EGL_DONT_CARE; + mode->Height = EGL_DONT_CARE; + mode->RefreshRate = EGL_DONT_CARE; + mode->Optimal = EGL_DONT_CARE; + mode->Interlaced = EGL_DONT_CARE; + mode->Name = NULL; + + for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) { + switch (attrib_list[i]) { + case EGL_MODE_ID_MESA: + mode->Handle = attrib_list[++i]; + if (mode->Handle <= 0) { + _eglError(EGL_BAD_PARAMETER, "eglChooseModeMESA(handle)"); + return EGL_FALSE; + } + break; + case EGL_WIDTH: + mode->Width = attrib_list[++i]; + if (mode->Width <= 0) { + _eglError(EGL_BAD_PARAMETER, "eglChooseModeMESA(width)"); + return EGL_FALSE; + } + break; + case EGL_HEIGHT: + mode->Height = attrib_list[++i]; + if (mode->Height <= 0) { + _eglError(EGL_BAD_PARAMETER, "eglChooseModeMESA(height)"); + return EGL_FALSE; + } + break; + case EGL_REFRESH_RATE_MESA: + mode->RefreshRate = attrib_list[++i]; + if (mode->RefreshRate <= 0) { + _eglError(EGL_BAD_PARAMETER, "eglChooseModeMESA(refresh rate)"); + return EGL_FALSE; + } + break; + case EGL_INTERLACED_MESA: + mode->Interlaced = attrib_list[++i]; + if (mode->Interlaced != EGL_TRUE && mode->Interlaced != EGL_FALSE) { + _eglError(EGL_BAD_PARAMETER, "eglChooseModeMESA(interlaced)"); + return EGL_FALSE; + } + break; + case EGL_OPTIMAL_MESA: + mode->Optimal = attrib_list[++i]; + if (mode->Optimal != EGL_TRUE && mode->Optimal != EGL_FALSE) { + _eglError(EGL_BAD_PARAMETER, "eglChooseModeMESA(optimal)"); + return EGL_FALSE; + } + break; + default: + _eglError(EGL_BAD_ATTRIBUTE, "eglChooseModeMESA"); + return EGL_FALSE; + } + } + return EGL_TRUE; +} + + +/** + * Determine if the candidate mode's attributes are at least as good + * as the minimal mode's. + * \return EGL_TRUE if qualifies, EGL_FALSE otherwise + */ +static EGLBoolean +_eglModeQualifies(const _EGLMode *c, const _EGLMode *min) +{ + if (min->Handle != EGL_DONT_CARE && c->Handle != min->Handle) + return EGL_FALSE; + if (min->Width != EGL_DONT_CARE && c->Width < min->Width) + return EGL_FALSE; + if (min->Height != EGL_DONT_CARE && c->Height < min->Height) + return EGL_FALSE; + if (min->RefreshRate != EGL_DONT_CARE && c->RefreshRate < min->RefreshRate) + return EGL_FALSE; + if (min->Optimal != EGL_DONT_CARE && c->Optimal != min->Optimal) + return EGL_FALSE; + if (min->Interlaced != EGL_DONT_CARE && c->Interlaced != min->Interlaced) + return EGL_FALSE; + + return EGL_TRUE; +} + + +/** + * Return value of given mode attribute, or -1 if bad attrib. + */ +static EGLint +getModeAttrib(const _EGLMode *m, EGLint attrib) +{ + switch (attrib) { + case EGL_MODE_ID_MESA: + return m->Handle; + case EGL_WIDTH: + return m->Width; + case EGL_HEIGHT: + return m->Height; + case EGL_REFRESH_RATE_MESA: + return m->RefreshRate; + case EGL_OPTIMAL_MESA: + return m->Optimal; + case EGL_INTERLACED_MESA: + return m->Interlaced; + default: + return -1; + } +} + + +#define SMALLER 1 +#define LARGER 2 + +struct sort_info { + EGLint Attrib; + EGLint Order; /* SMALLER or LARGER */ +}; + +/* the order of these entries is the priority */ +static struct sort_info SortInfo[] = { + { EGL_OPTIMAL_MESA, LARGER }, + { EGL_INTERLACED_MESA, SMALLER }, + { EGL_WIDTH, LARGER }, + { EGL_HEIGHT, LARGER }, + { EGL_REFRESH_RATE_MESA, LARGER }, + { EGL_MODE_ID_MESA, SMALLER }, + { 0, 0 } +}; + + +/** + * Compare modes 'a' and 'b' and return -1 if a belongs before b, or 1 if a + * belongs after b, or 0 if they're equal. + * Used by qsort(). + */ +static int +_eglCompareModes(const void *a, const void *b) +{ + const _EGLMode *aMode = *((const _EGLMode **) a); + const _EGLMode *bMode = *((const _EGLMode **) b); + EGLint i; + + for (i = 0; SortInfo[i].Attrib; i++) { + const EGLint aVal = getModeAttrib(aMode, SortInfo[i].Attrib); + const EGLint bVal = getModeAttrib(bMode, SortInfo[i].Attrib); + if (aVal == bVal) { + /* a tie */ + continue; + } + else if (SortInfo[i].Order == SMALLER) { + return (aVal < bVal) ? -1 : 1; + } + else if (SortInfo[i].Order == LARGER) { + return (aVal > bVal) ? -1 : 1; + } + } + + /* all attributes identical */ + return 0; +} + + +/** + * Search for EGLModes which match the given attribute list. + * Called via eglChooseModeMESA API function. + */ +EGLBoolean +_eglChooseModeMESA(_EGLDriver *drv, EGLDisplay dpy, EGLScreenMESA screen, + const EGLint *attrib_list, EGLModeMESA *modes, + EGLint modes_size, EGLint *num_modes) +{ + const _EGLScreen *scrn = _eglLookupScreen(dpy, screen); + _EGLMode **modeList, min; + EGLint i, count; + + if (!scrn) { + _eglError(EGL_BAD_SCREEN_MESA, "eglChooseModeMESA"); + return EGL_FALSE; + } + + if (!_eglParseModeAttribs(&min, attrib_list)) { + /* error code will have been recorded */ + return EGL_FALSE; + } + + /* allocate array of mode pointers */ + modeList = (_EGLMode **) malloc(modes_size * sizeof(_EGLMode *)); + if (!modeList) { + _eglError(EGL_BAD_MODE_MESA, "eglChooseModeMESA(out of memory)"); + return EGL_FALSE; + } + + /* make array of pointers to qualifying modes */ + for (i = count = 0; i < scrn->NumModes && count < modes_size; i++) { + if (_eglModeQualifies(scrn->Modes + i, &min)) { + modeList[count++] = scrn->Modes + i; + } + } + + /* sort array of pointers */ + qsort(modeList, count, sizeof(_EGLMode *), _eglCompareModes); + + /* copy mode handles to output array */ + for (i = 0; i < count; i++) { + modes[i] = modeList[i]->Handle; + } + + free(modeList); + + *num_modes = count; + + return EGL_TRUE; +} + + + +/** + * Return all possible modes for the given screen. No sorting of results. + * Called via eglGetModesMESA() API function. + */ +EGLBoolean +_eglGetModesMESA(_EGLDriver *drv, EGLDisplay dpy, EGLScreenMESA screen, + EGLModeMESA *modes, EGLint modes_size, EGLint *num_modes) +{ + _EGLScreen *scrn = _eglLookupScreen(dpy, screen); + + if (!scrn) { + _eglError(EGL_BAD_SCREEN_MESA, "eglGetModesMESA"); + return EGL_FALSE; + } + + if (modes) { + EGLint i; + *num_modes = MIN2(scrn->NumModes, modes_size); + for (i = 0; i < *num_modes; i++) { + modes[i] = scrn->Modes[i].Handle; + } + } + else { + /* just return total number of supported modes */ + *num_modes = scrn->NumModes; + } + + return EGL_TRUE; +} + + +/** + * Query an attribute of a mode. + */ +EGLBoolean +_eglGetModeAttribMESA(_EGLDriver *drv, EGLDisplay dpy, + EGLModeMESA mode, EGLint attribute, EGLint *value) +{ + _EGLMode *m = _eglLookupMode(dpy, mode); + EGLint v; + + if (!m) { + _eglError(EGL_BAD_MODE_MESA, "eglGetModeAttribMESA"); + return EGL_FALSE; + } + + v = getModeAttrib(m, attribute); + if (v < 0) { + _eglError(EGL_BAD_ATTRIBUTE, "eglGetModeAttribMESA"); + return EGL_FALSE; + } + *value = v; + return EGL_TRUE; +} + + +/** + * Return human-readable string for given mode. + * This is the default function called by eglQueryModeStringMESA(). + */ +const char * +_eglQueryModeStringMESA(_EGLDriver *drv, EGLDisplay dpy, EGLModeMESA mode) +{ + _EGLMode *m = _eglLookupMode(dpy, mode); + if (!m) { + _eglError(EGL_BAD_MODE_MESA, "eglQueryModeStringMESA"); + return NULL; + } + return m->Name; +} + + +#if 0 +static int +_eglRand(int max) +{ + return rand() % max; +} + +void +_eglTestModeModule(void) +{ + EGLint count = 30; + _EGLMode *modes = (_EGLMode *) malloc(count * sizeof(_EGLMode)); + _EGLMode **modeList = (_EGLMode **) malloc(count * sizeof(_EGLMode*)); + EGLint i; + + for (i = 0; i < count; i++) { + modes[i].Handle = _eglRand(20); + modes[i].Width = 512 + 256 * _eglRand(2); + modes[i].Height = 512 + 256 * _eglRand(2); + modes[i].RefreshRate = 50 + 5 * _eglRand(3); + modes[i].Interlaced = _eglRand(2); + modes[i].Optimal = _eglRand(4) == 0; + modeList[i] = modes + i; + } + + /* sort array of pointers */ + qsort(modeList, count, sizeof(_EGLMode *), compareModes); + + for (i = 0; i < count; i++) { + _EGLMode *m = modeList[i]; + printf("%2d: %3d %4d x %4d @ %3d opt %d int %d\n", i, + m->Handle, m->Width, m->Height, m->RefreshRate, + m->Optimal, m->Interlaced); + } +} +#endif |