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mesa/src/egl/main/eglmode.c

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#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
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