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Merge "Add new debug option to force 4x MSAA in OpenGL ES 2.0 apps" into jb-mr1-dev

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Romain Guy 2012-10-15 18:43:19 -07:00 committed by Android (Google) Code Review
commit b96fe08540
1 changed files with 53 additions and 0 deletions
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53
opengl/libs/EGL/eglApi.cpp
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@ -204,6 +204,59 @@ EGLBoolean eglChooseConfig( EGLDisplay dpy, const EGLint *attrib_list,
egl_connection_t* const cnx = &gEGLImpl;
if (cnx->dso) {
if (attrib_list) {
char value[PROPERTY_VALUE_MAX];
property_get("debug.egl.force_msaa", value, "false");
if (!strcmp(value, "true")) {
size_t attribCount = 0;
EGLint attrib = attrib_list[0];
// Only enable MSAA if the context is OpenGL ES 2.0 and
// if a depth buffer is requested
const EGLint *attribRendererable = NULL;
const EGLint *attribCaveat = NULL;
// Count the number of attributes and look for
// EGL_RENDERABLE_TYPE and ELG_DEPTH_SIZE
while (attrib != EGL_NONE) {
attrib = attrib_list[attribCount];
switch (attrib) {
case EGL_RENDERABLE_TYPE:
attribRendererable = &attrib_list[attribCount];
break;
case EGL_CONFIG_CAVEAT:
attribCaveat = &attrib_list[attribCount];
break;
}
attribCount++;
}
if (attribRendererable && attribRendererable[1] == EGL_OPENGL_ES2_BIT &&
(!attribCaveat || attribCaveat[1] != EGL_NONE)) {
// Insert 2 extra attributes to force-enable MSAA 4x
EGLint aaAttribs[attribCount + 4];
aaAttribs[0] = EGL_SAMPLE_BUFFERS;
aaAttribs[1] = 1;
aaAttribs[2] = EGL_SAMPLES;
aaAttribs[3] = 4;
memcpy(&aaAttribs[4], attrib_list, attribCount * sizeof(EGLint));
EGLint numConfigAA;
EGLBoolean resAA = cnx->egl.eglChooseConfig(
dp->disp.dpy, aaAttribs, configs, config_size, &numConfigAA);
if (resAA == EGL_TRUE && numConfigAA > 0) {
ALOGD("Enabling MSAA 4x");
*num_config = numConfigAA;
return resAA;
}
}
}
}
res = cnx->egl.eglChooseConfig(
dp->disp.dpy, attrib_list, configs, config_size, num_config);
}